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Full text of "Hammond Organ Service Manual - Models M M2 M3 M-100"


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INGLUDINe 
PARTS LIST 







H 000-006059 



CAUTION 

SEE SAFETY NOTICE ON 
INSIDE COVER SHEET 



ORGAN SERVICE COMPANY 

6475 JOLIET ROAD SUITE B-t 

LaGRANGE ILLINOIS 60525 

PHONE 708-352-8011 



SAFETY NOTICE 

Great care has bean taken In the design and manufacture of this product to assure that no 
shock hazard exists on any exposed metal parts. Internal service operations can expose the 
technician to hazardous line voltages and accidentally cause these voltages to appear on 
exposed metal parts during repair or reassembly of product components. To prevent this, work 
on these products should oniy be performed by those who are thoroughly familiar with the 
precautions necessary when working on this type of equipment. 

To protect the user, It Is required that all enclosure parts and safety Interlocks be rettored to 
their original condition and the following tests be performed before returning the product to 
the owner aftor any service operation. 

Plug the AC iine cord directiy Into a line voltage AC receptacle (do not use an Isolation 
transformer for this test) and turn the product on. Connect the network (as shown below) In 
senes with all exposed metal parts and a Known earth ground such as a water pipe or conduit. 
Use an AC VOM of 5,000 ohms per volt or higher sensitivity to measure the voltage drop across 
the network. Move the network connection to each exposed metal part (metal chassis, screw 
heads, knobs and control shafts, escutcheon, etc.) and measure the voltage drop across the 
network. Reverse the line plug and repeat the measurements. Any reading of 4 volts RMS or 
more is excessive and indicates a potential shock hazard which must be corrected before 
returning the product to the user. 




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TEST 
PROBE 



VOM 
AC SCALE 



I OK 



I I 

.01 Mf 
CERAMIC RF 
BYPASS CAP 

TEST CLIPS 




CONNECTEQ TO WQWN 
EARTK ORQUHO 



TO EXPOSED HETAL PARTS 



TABLE OF CONTENTS 



PAGE 



PAGE 



GENERAL DESCRIPTION 



INSTALLATION AND MAINTENANCE 



MUSICAL TERMS 



NOTES AND OCTAVES 



HABMONICS OR OVERTONES 



ONE KEY DOES NOT PLAY 19 

ONE NOTE IS WEAX 20 

PERCUSSION NOTES VEAK 2I 

PEDAL NOTE SOUNDS AT FULL VOLUME 21 

PEDAL NOTE SOUNDS FAINTLY 21 



BOW THE ORGAN WORKS 



HUM 



21 



CONSTRUCTION AND OPERATION OF COMPONENTS 7 

MOTORS AND POWER SWITCHES 7 



TONE GENERATOR 



MANUALS 8 

HARMONIC DRAWBARS 9 

PEDAL DRAWBAR 9 

PEDAL KEYBOAIU) 9 

EXPRESSION PEDAL 10 

CONTROL TABLETS 10 

PERCUSSION CONTROL TABS 10 

VIBRATO TABS 11 

+ 

PRESET TABS 12 

REVERBERATION-VOLUME SOFT TABS ,,.12 

AMPLIFIER ASSEMBLY 12 

MANUAL SECTION OF AMPLIFIER 13 

PEDAL SECTION OF AMPLIFIER I A 

INTERMEDIATE SECTION OF AMPLIFIER 15 

OUTPUT SECTION OF AMPLIFIER ,.,. 15 

PERCUSSION SECTION OF AMPLIFIER 16 

POWER SUPPLY 17 

TUBE SOCKET VOLTAGES H 



REVERBERATION AMPLIFIER 



17 



SPECIAL EQUIPMENT 18 

RADIO, PHONOGRAPH, OR MICROPHONE 18 

EXTENSION SPEAKER 18 

EAR PHONES IS 

SPECIAL POV,^R SOURCES 19 



PRACTICAL SERVICE SUGGESTIONS 



19 



ORGAN DOES NOT PLAY 19 



REPLACING TUBES 22 

PROCEDURE FOR REMOVING PARTS 22 

UPPER MANUAL KEY 22 

LOWER MANUAL KEY 22 

DRAWBAR CONTACT SPRING 23 

DRAWBAR OR DRAWBAR KNOB 23 

UPPER MANUAL 24 

LOWER MANUAL 25 

CONTROL PANEL ACCESS 26 

PERCUSSION SWITCH ACCESS 26 

GENERATOR 26 

STARTING MOTOR 26 

PILOT LIGHT 26 

TAB SWITCH 26A 

VIBRATO LINE BOX 26A 

PEDAL KEYBOARD 26A 

EXPRESSION PEDAL 26A 

PRESET PERCUSSION UNIT 77 

SELECTOR SWITCH 78 

HARMONIC BUSBAR SWITCHING & REIT- SPLIT 78 

UPPER MANUAL 78 

MODE SWITCH 79 

FREQUENCY DIVIDER 79 

CYMBAL AND BRUSH 80 

BRUSH KEi'ING 80 

. CYMBAL KEYING 80 

CXMBAL-BRUSH AMPLIFIER AND NOISE GATE 80 

CH.\NnES AM REVISIONS 81 

IiKTALLr\TION AND MAINTENANCE BACK COVER 



1 



LIST OF FIGURES AND ILLUSTRATIONS 



FIGURE 



PAGE 



1 . Front View of Console - Model M 27 

2. Front View of Console - Model M-2 28 

3. Back View of Console - Model M, M-2 29 

4. Front View of Console - Model M-3 30 

5. Back View of Console - Model M-3 31 

6. Front View of Console - Model M-lOO 32 

7. Back View of Console - Model M-lOO 33 

8. Block Diagram - Model M ." 34 

9 . Block Diagram - Model M-2 34 

10. , Block Diagram - Mcdel M-3 35 

11. Block Diagram - Model M-lOO 35 



12. Typical Tone Generator 



36 



13. Magnet Locations on Tone Generator . , , . 36 

14 . Generator Cover - Model M 37 

14A. Generator Cover - Model M - Serial 15083 and Up 37 

15. Generator Cover - Model M, M-2, M-3 38 

16 . Generator Cover - Model M-3 - 90485 and above 39 



17. Generator Cover - Model M-lOO 



40 



18. Manual Wiring Chart 41 

19. Drawbar Assembly 42 

20. Pedal Keyboard Assembly - M, M-2, M-3 42 

21. Pedal Keyboard Assembly - M-lOO 43 

22. Fundamental Vibrato System - M 43 

23. Vibrato System - Model M - 13509 and below 44 

24. Vibrato System - Model M - 13509 and above 44 

25. Fundamental Vibrato System - M-2, M-3 45 



LIST OF FIGURES AND ILLUSTRATIONS CONTINUED 



FIGURE 



PAGE 



26. Fundamental Vibrato System - M-lOO 46 

27. Vibrato Line Box-Model M, M-2 46 

28. Vibrato Line Box - M-3 47 



29. Vibrato Line Box - M-lOO 



47 



30. Vibrato Scanner 47 

31. Vibrato System M-2 - Serial 19000 to 22253 48 

32. Vibrato System M-2 - Serial 25254 and above 48 

33. Manual Hold Down Screws (M, M-2, M-3) 49 

34. Pictorial - Model M Amplifier 50 

35. Pictorial - Model M Amp. - Serial 8411 and above 51 

36. Pictorial - Model M-2 Amp. Serial 19000 and above 52 

36A. Pictorial - Model M-3 Amp (Partial) 53 



36B. Pictorial - Model M-3 Amp 



54 



37. Schematic AO-35 Reverberation Amp M-lOO 55 

38. Schematic AO-44 Reverberation Amp M-lOO 56 

38A. Schematic AO-44 - See Serial Numbers 57 

39. Schematic AO-66 Reverberation Amp (Later Model M-lOO) 58 

40. Schematic Model M 59 



41. Wiring Diagram Model M 



60 



41A. Wiring Diagram Model M - Serial 15083 and above 61 

42. Schematic Model M-2 - 19000 and above 62 

43. Wiring Diagram Model M-2 - Serial 19000 and above 63 

43A. Wiring Diagram Model M-2 - Serial 25254 and above 64 

44. Schematic Model M-3 65 

F 

44A. Schematic Model M-3 Serial 90485 and above 66 

44B. Schematic Model M-3 - Serial 109466 and above 67 



45. Wiring Diagram Model M-3 



68 



LIST OF FIGURES AND ILLUSTRATIONS CONTINUED 



FIGURE 



PAGE 



45A. Wiring Diagrams Model M-3 - Serial 90485 and above 69 

46. Schematic Model M-lOO with AO-35 and AO-29 70 

47- Schematic Model M-lOO with AO-44 and AO-29 71 

48. Schematic Model M-lOO with AO-66 and AO-67 72 

49. Wiring Diagram M-lOO with AO-35 Amp 73 

50 . Wiring Diagram M-lOO with AO-44 Amp 74 

51. Wiring Diagram M-lOO Control Panel , 73 

i 

M-IOOA SUPPLEMENT 

52. M-IOOA Percussion Kit Wiring Diagram 82 

53. Brush and Cymbal Wiring Diagram with AO-66 Amp 83 

54. Brush and Cymbal Wiring Diagram with AO-44 Amp °^ 

55. Schematic - Percussion Preset Unit 85 

56. Schematic Diagram Model M-IOOA 87 

57 . Wiring Diagram Model M-IOOA 88 

58. Percussion Kit Circuit Board Component Layout 89 



4 



GENERAL DESCRIPTION 

The Hammond Organ "m" Series Spinet Consoles are completely self contained, re- 
quiring no external tone cabinet. All Models have two (2) manuals of forty-four 
(44) keys each, a 12 (M, M-2, M-3) or 13 (M-lOO) note pedal keyboard, and an ex- 
pression (or swell) pedal for controlling the volume. All tones are produced 
by electro-magnetic tone generators and electrically amplified. Selection of tone 
colors is made by adjusting eighteen(18) drawbars, and other characteristics of 
the music are adjusted by means of tilting control tablets and tab switches. A 
push button and a toggle switch or two toggle switches located in the front of 
the Console are used to turn on the organ. 

Figures 1 thru 7 show the front and rear views of the "M" Series Models- The 
rear views are shown with the dust covers removed. Console rear panels are an 
optional accessory and are not shown. 

INSTALLATION AND MAINTENANCE 

A card packed with the playing instructions or located in the bench gives full in- 
formation on installing the organ, oiling, and packing for moving or shipment. 
(See Back Cover) 

MUSICAL TERMS 

The service man who has had no musical training will find the following infor- 
mation helpful in studying the operation of the organ. 

NOTES AND OCTAVES 

Keyboard instruments are divided into '^octaves" of 12 keys or notes, each with 
spven (7) ''naturals" (white keys) and five (5) "sharps" or "flats" (black keys) 
in a definite sequence. Black keys occur in groups of two and three in each 
octave and offer a convenient way to identify the notes of the octave. Techni- 
cally there is no difference between a black key and a white one, since each key 
has a frequency 1.059 times the frequency of the next one below it. 

Each note has a frequency exactly one half that of the corresponding note in the 

next higher octave. Each white key is called by a letter for A to G and these 

letters are known as "note of the musical scale", A black key may be called a 
"sharp"of the notes below it or a '^flat" of the notes above it; for instance, the 

black key between C and D may properly be called Cif (Sharp) or D*^ (D flat). 

HARMONICS OR OVERTONES 

Any musical note has a definite fundamental pitch or frequency and also a certain 
"tone quality" or "timbre" depending on its wave shape. A complex note is one 
which includes not only a fundamental frequency but also one or more "harmonics" 
or "overtones," each of which is an integral multiple of the fundamental frequency. 
Such a combination is more pleasing musically than a note having only a single 
frequency. The ear does not distinguish the harmonics independently , but instead 
identifies the note as a complex tone having the pitch of the lowest component, . 
or fundamental . 

HOW THE ORGAN WORKS 

Most tone sources, such as strings, reeds , or pipes, produce complex tones . The 
Hammond tone producing mechanism, however, generates individual frequencies which 
can be combined by means of harmonic drawbars to produce any desired tone quality. 
The block diagrams in Figures 8 thru 11 show the chief components of the instru- 
ments. 



Electrical impulses of various frequencies are produced in the "tone generator'^ 
which contains a number of "tone wheels" driven at predetermined speeds by a 
motor and gear arrangement. Each tone wheel is a steel disc similar to a gear^ 
with high and low spots, or teeth, on its edge (see figure 12). As the wheel 
rotates these teeth pass near a permanent magnet, and the resulring variations 
in the magnetic field induce a voltage in a coil wound on the magnet. This 
small voltage, when suitably filtered, produces one note of the musical scale, 
its pitch or frequency depending on the number of teeth passing the magnet each 
second. 

A note played on either manual of the organ consists of a fundamental pitch and 
a number of harmonics, or multiples of the fundamental frequency. The fundament 
al and eight harmonics available on each playing key are controllable by means 
of drawbars. By suitable adjustment of these controls the player may vary the 
tone colors at will. The M-lOO Console has several preset tabs which make sever- 
al pre-selected tones available, 

MODEL M 

Mixed tones from the manuals are amplified and then pass through the vibrato 
mechanism, the expression control, and additional stages of amplification before 
reaching the loudspeaker - 

MODEL M-2i M-3i M-lOO 

Mixed tones from either the upper or the lower manual may go through either the 
"vibrato" channel or the "No Vibrato" channel, depending on the position of the 
corresponding vibrato selector of "Vibrato Cancel" tabs. (The upper manual is 
called "Solo" on the selector tab of the M-2 and M-3 to indicate that it is 
best suited for playing melody or solo parts of the music.) The tones are then 
combined and passed through the expression control and additional stages of 
amplification before reaching the speaker(s)- 

MODEL M-3» M-lOO 

Percussion tones are produced by borrowing a signal from the upper manual 2nd 
harmonic drawbar, 3rd harmonic drawbar, or both, amplifying it, returning part 
of the signal to the same drawbar, and conducting the balance of the signal 
through push-pull control tubes where its decay characteristics are controlled. 
The percussion signal is then combined with the signal from the manuals after 
the vibrato system but before the expression control. The control tubes are 
keyed through the 6th harmonic key contacts and bus bar. 

The pedal tones do not require drawbars for tone color variation, because they 
are produced as complex tones by special tone wheels. From the pedals these 
tones go to a pedal amplifier, where the attack and decay characteristics are 
controlled. The single pedal drawbar adjusts the volume of the pedals relative 
to that of the manuals, and the pedal signal than is combined with the signal 
from the manual before passing through the expression control, but after the 
vibrato system. 



CONSTRUCTION AND OPERATION OF COMPONENTS 

In reviewing this section refer to the schematic circuits of the entire organ 
systems in the back of this manual. Connections between components are shown in 
the wiring diagrams and control assembly wiring drawings, also in the back of the 
manual, 

MOTORS AND POWER SWITCHES 

The tone generator assembly in which all tones of the organ originate, is 
driven at constant speed by a synchronous motor, located at the left side as you 
look in at the back of the Console. Attached to it is the vibrato scanner. As 
the synchronous motor is not self-starting, it must be brought up to speed by 
a starting motor at the opposite end of the generator. 

The procedure for turning on the organ is as follows: Push the "start'' switch 
up (M-3, M-lOO) or in (M, M-2) and hold it for approximately eight seconds. 
This allows time for the starting motor to bring the generator up to slightly 
above it synchronous speed- While still holding the "start" switch, push the 
"run" switch upward to its "on" position. This turns on the synchronous motor 
and at the same time introduc,es a resistor in series with the starting motor 
to reduce its power- Hold the "start" switch about four seconds longer and then 
release it- 

During this time the braking action of the synchronous motor, together with the 
reduction in power of the starting motor, brings the system to synchronous 
speed so that the synchronous motor can carry the load. 

To turn off the. organ, push the "run" switch downward to the "off" position. 

a 

TONE GENERATOR 

All tones of the organ originate as electrical signals in the tone generator 
assembly. The M, M-2 and M-3 contains 85 tone wheels while the M-lOO has 87, 
Each of these wheels has various numbers of teeth, with suitable gears for driv- 
ing them at various speeds from a main shaft extending along the center. Each 
pair of tone wheels is mounted on a shaft and between them is a bakelite gear 
held between two coil springs, forming a mechanical vibration filter. As the 
gear is not rigidly attached to the shaft, any pair of wheels which may be 
stopped accidentally will not interfere with the operation of the others. 

Adjacent to each tone wheel is a magnetized rod with a pick-up coil wound on 
it. These magnets extend through the front and back of the generator, and are 
held by set screws which can be loosened in case adjustment is ever necessary. 
Figure 13 shows where to find the magnet for any frequency number. In this 

drawing the dotted lines indicate frequencies whose tone wheels are on the 
same shaft. 

On top of the tone generator assembly are small transformers and condensers , 
forming tuned filters for the higher frequencies. They are not likely to need 
replacing. In case one filter becomes inoperative, both the transformers and 
condenser must be replaced with a matched set from the factory. Figures 14, 
15 » 16 and 17 show the locations of these filters on the indicated models. A 
few frequencies use untuned filters consisting of coils alone. 



The output frequencies of the tone generator are numbered , for convenience, in 
order of increasing frequency. The lowest, number 1 , is about 32 cycles per 
second, and the highest, number 91, is about 6000 cycles per second. Frequency 
numbers 1 to 12 (1 to 13 on M-lOO) are used for pedals; numbers 13 to 17 (14 to 
17 on M-lOO) are omitted; and numbers 18 to 91 are used for the manuals. 

In case any generator frequency is weak or absent, refer to "Practical Service 
Suggestions" for the procedure to be used in locating and correcting the trouble. 

The output terminals of the generator consist of solder lugs mounted on the fil- 
ter transformers, to which the manual cable and pedals are connected* The fre- 
quency numbers of all terminals are indicated in Figures 14, 15, 16 and 17. 

MANUALS 

Musical frequencies from the tone generator go through the manual cable to term- 
inal strips on the two manuals and from them to the key contact springs- 
Each of the two manuals has forty-four (44) playing keys, or approximately 
3-1/2 octaves. The two manuals do not cover exactly the same pitch range, but 
they are arranged so that keys of like pitch are in line. Middle "C" is the first 
C on the upper manual and the key in line with it on the lower manual. 

Under each key are a number of contact springs (for the fundamental and har- 
monics of that key) which touch an equal number of busbars when the key is press- 
ed, (Some keys at the right end of each manual have fewer springs, as noted be- 
low) - All contact springs and busbars have precious metal contact surfaces to 
avoid corrosion, and the manuals are sealed to exclude dust so far as possible. 
In case a contact becomes dirty in spite of these precautions, a busbar shifter 
(shown in Figures 3, 5,7) is provided in each manual to slide the busbars end- 
wise and thus provide a fresh contact surface. 

The busbar shifting mechanism is somewhat different on the M-lOO than on prior 
models of the Hammond Orgam Models M, M-2 and M-3. Looking under the lower man- 
ual on the left hand end, a black wood end block will be observed. One half inch 
from the front of this block is a drilled hole. Within this drilling is a small 
metal tongue with a punched hole. Using either long nose pliers or a hook, this 
tongue can be moved in and out and it in turn moves the busbars. The upper man- 
ual shifter is in a similar place, but requires removal of the generator dust 
cover to gain access to it. 

The key contacts are connected through resistance wires to the manual terminal 
strips. The manual wiring chart Figure 18, shows how the contact of each key 
are connected to the proper frequencies to supply the fundamental and harmonics 
of that particular key. The blank spaces indicate that no key contact is used, 
inasmuch as the highest harmonics of the highest keys are above the range of the 
tone generator and are not required. Since the percussion control tubes in the 
M-3 and M-lOO are keyed through the 6th harmonic busbar, the blank spaces in this 
row have contacts connected to ground through resistance wires. 

The busbars of each manual, each one carrying a certain harmonic, are wired to 
the harmonic drawbars for that manual in the M, M-2, M-3 and through the "Draw- 
bars" tab in the M-IOO- 



8 



HARMONIC DRAWBARS 

The left group of eight (8) harmonic drawbars (Figure 19) is associated with the 
lower manual, and the right group of nine (9) drawbars controls the upper manual. 
By sliding these drawbars in and out, the organist is able to mix the fundamen^ 
tal and harmonics (or overtones) in various porportions. The distance a bar is 
pulled out determines the strength of the corresponding harmonic; and if a draw- 
bar is set all the way in, the harmonic it represents is not present in the 
mixture. Neither manual will play unless at least one of its drawbars is pulled 
out at least part of the way in the case of the M, M-2, M-3, or with the "Draw- 
bars^' tab pressed or preset tab pressed in the M-100. 

The drawbars slide over nine (9) busbars , representing intensity levels, and 
each drawbar has two contacts connected together by a one ohm resistor. As the 
drawbar moves, at least one of the contacts is touching some busbar at all times, 
and therefore there is no "dead spot" in the drawbar motion. The one ohm re- 
sistor avoids an actual short circuit between adjacent busbars. These busbars 
extend the length of the drawbar assembly but are split in the middle to form 
two groups of nine (9)- Those in the left group, under the lower manual draw* 
bars, are connected to low impedance primary taps on the lower manual matching 
transformer. Similarly, those in the right group, under the upper manual 
drawbars, are connected to taps on the upper manual matching transformer- Sig- 
nals from the high impedance secondaries of these two transformers go through 
the lower manual "Vibrato Cancel" and upper manual "Vibrato Cancel" tabs to the 
apraplif ier input terminals - 

PEDAL DRAWBAR 

The 12 (M, M-2, M-3) or 13 (M-100) playing pedals are operated by the left foot 
and are connected to the lowest 12 or 13 frequencies of the generator. The 
center drawbar adjusts the volume of the pedals. It operates a variable con- 
denser (shown in Figures 3, 5, and 7) which is connected to the pedal section 
of the amplifier. For operation of the circuit see description of "amplifier," 

PEDAL KEYBOARD 

The 13 playing pedals are operated by the left foot and are connected to the 
lowest 13 frequencies of the generator. Like the manuals, they have light and 
dark keys arranged in the standard octave pattern. Figures 20 and 21 identifies 
the pedals and shows the generator frequency number associated with each. 

A "pedal contact" on each pedal opens when the pedal is pressed, thereby allow- 
ing the correct generator frequency to reach the amplifier. In addition there is 
a "pedal keying contact'' for all pedals, which closes when any pedal is operated. 
It serves to key the pedal amplifier, causing the note to sound at the desired 
rate- 
When a pedal is pressed its "pedal contact" opens first, selecting the correct 
note. Immediately the "pedal keying contact" closes, causing the note to sound. 
When the pedal is released a mechanical latch keeps the "pedal contact" open, 
so that the last-played pedal note continues to sound for a length of time de- 
termined by the position of the pedal "Fast Decay" and "Pedal Legato" tabs in 
the M-100. In the M, M-2, and M-3; the time which the pedal sound is heard is 
determined by the setting of the "Pedal Decay" tablet and a "Pedal sustaining 
control" attached to the expression control. The electrical operation of these 
circuits is described under "amplifier"- 



9 



EXPRESSION PEDAL 

The "expression" pedal, sometimes called "swell" pedal (Figures 1 , 2, 4, and 6) 
is operated by the player's right foot and varies the volume of both manuals 
and pedals together. It is connected mechanically to a special variable air 
condenser mounted on the amplifier. When the pedal is tilted back (closed) 
by pushing on the player's heel the music is softest, and when pushed forward 
(opened) by Che player's toe the music is loudest- 

In the M, M-2, and M-3, attached to the expression pedal is a "pedal sustain- 
ing control" lever, which is operated by sliding the foot sldewlse on the 
pedal. If this lever is not pressed, each pedal note dies away rapidly or 
slowly, depending on the setting of the "pedal decay" tablet. If the lever 
is pressed to the left, the last-played pedal note dies away much more slowly, 

CONTROL TABLETS 

The Model M has 6, while the M-2 and M-3 have 7 of these control tablets and 
each has two positions (figures 1, 2 and 4). The "volume" tablet changes the 
overall volume and thus supplements the expression pedal. The "pedal attack" 
tablet determines how fast a pedal note sounds after a pedal is depressed, and 
"pedal decay" determines how fast the sound dies away after the pedal is re- 
leased. 

The "vibrato lower manual" and "vibrato solo manual" tablets turn the vibrato 

effect on and off independently on the lower and upper manuals respectively. 

The next tablet provides a choice of "normal vibrato" or "vibrato chorus" 

(it is effective only when the vibrato effect is on). The last tablet can 

be set for "small" or "normal" vibrato to adjust the extent of the pitch vari- 
ation provided by the vibrato mechanism, 

The M-lOO has 24 tabs, each providing some change in the instruments operation. 
To have the instrument sound after turning it on, tabs such as "Full Organ" 
and "Ensemble" will place the upper and lower manual in operation. A tab is 
in use when in the down position. Functions of the various tabs from left to 
right as they appear on the instrument are given in the following paragraphs. 

PERCUSSION CONTROL TABLETS 

The M-3 and the M-lOO are the only two Models which contain percussion and each 
unit has four (4) associated tabs. 

In the M-lOO, these tabs operate only when the upper manual "Drawbars" tab 
is pressed. Pressing either "Second Harmonic" or "Third Harmonic" will, when 
the Upper manual is played, cause the tone to sound percussively (in addition 
to sustained organ tones). Both tabs can be pressed, giving a combination per- 
cussive tone, "Fast Decay" causes the percussive tones to fade away with 
greater rapidity- "Percussion Soft" reduces the volume for the percussive 
signal. 

In the M-3, when the "Percussion" on-off tablet is "On", the Solo (Upper) man- 
ual will play 2nd or 3rd harmonic tones percussively (in addition to the sus- 
tained organ tones). The "Volume" tablet in "Normal" position allows the per 
cussion tones to soilnd percussively as with the M-lOO and reduces the level 
of the Solo manual sustained organ tones to maintain proper balance between 
the manuals. In "Soft" position it allows the percussion tones to sound 
only softly and restores the full level of the Solo manual sustained organ 
tones. The "Decay" tablet determines how fast the percussion tones fade 
away when the Solo manual key is pressed. 



10 



Operation of the electrical circuits associated with the percussion feature 
are described in the percussion section of the amplifier theory. 

VIBRATO TABLETS 

The Model M vibrato uses three control tabs- Two degrees of vibrato are 
available with the "amount of Vibrato" tablet and the "Vibrato Chorus". A 
third tablet marked "Vibrato" turns the effect on or off. 

The M-'2, M-3, and M-lOO have a selective vibrato system, using four (4) con- 
trol tablets to vary the vibrato effect. On the M-lOO series only, an addit- 
ional stop (Vibrato Cancel) to the right of the preset tabs permits any 
Vibrato effect to be cancelled immediately. 

The vibrato effect is created by a periodic raising and lowering of pitch, 
and thus is fundamentally different from a tremolo, or loudness variation. 
It is comparable to the effect produced when a violinist moves his finger back 
and forth on a string while playing, varying the frequency while maintaining 
constant volume. 

The Hammond Vibrato equipment (See Fundamental Diagram of Vibrato System, 
Figures 22, 25,26) varies the frequency of all tones (excepting the pedal and 
percussive tones) by continuously shifting their phase. It includes a phase 
shift network or electrical time delay line, composed of a number of low pass 
filter sections, and a capacity type pickup or scanner, which is motor driven 
so that it scans back and forth along the line. 

Electrical waves fed into the line are shifted in phase by each line section 
(the amount per section being proportional to frequency), so that at any tap of 
the line the phase is retarded relative to the previous tap • 

The scanning pickup traveling along the line will thus encounter waves increas^ 
ingly retarded in phase at each successive tap. As a shift in phase is equiva- 
lent to an instantaneous change in frequency, the continuous change in phase 
becomes a continuous frequency variation. Since the scanner sweeps from start 
to end of the line and then back, it alternately raises and lowers the output 
frequency, the average remaining equal to the input frequency. 

The exact amount of frequency shift depends not only on the amount of phase 
shift in the line but also on the scanning rate. This rate, however, is constant 
because the scanner is driven by the synchronous running motor of the organ. 

In the M, M-2, and M-3, the "Amount of Vibrato" tablet varies the amount of 
frequency shift by causing the whole line to be scanned for "Normal Vibrato" 
and only one fourth of it for "Small Vibrato". 

In the M-lOO, the "Vibrato Small" Tablet varies the amount of frequency shift 
by causing two thirds of the line to be scanned, in contrast to the entire 
line when in the up position. 

A vibrato chorus effect, similar to the effect of two or three slightly out-of- 
tune frequencies mixed together, is obtained when the vibrato output signal 
is mixed with a portion of signal without vibrato. This is accomplished by the 
"Vibrato Chorus" tab, which causes only part of the Incoming signal to appear 
across the vibrato line and the rest across a resistor in series with the line- 
As the vibrato effect is applied to the part of the signal appearing across the 
line but not to the part appearing across the resistor, the combination pro- 
duces a chorus effect - 

11 



In the M-lOO, a Celeste effect is obtainable by the use ''Vibrato Celeste I" 
and "Vibrato Celeste II" tabs. These can be used independently or together. 
Use of these tabs introduces a resistor network at the far end of the Vibrato 
line, changing the termination impedance. This in turn causes a reflective 
signal to appear in the line, which is picked up by the scanner. 

In the Model M, to remove the vibrato effect entirely, the 'Vibrato" tablet 
in "off" position places a very large resistor in series with the vibrato 
line. Practically all of the signal appears across this resistor and the 
vibrato effect is virtually eliminated. A compensation circuit consisting of 
Rl and CI maintains constant volume by introducing negative feedback with the 
"vibrato" tablet "off". (See Figures 23 and 24). 

Figures 23 thru 26 show only the "Vibrato" channel of the amplifier. All tones 
sent through this channel have the vibrato effect. In the M-lOO, when vibrato 
is not desired on one manual or both, the "Vibrato Cancel" tabs in the down 
position feed their signals through the "no Vibrato" channel of the amplifier. 

Figures 27, 28 and 29 show the vibrato line box. See figures 3, 5, and 7 for 
location of line box. 

The scanner is mounted on the synchronous motor and driven at 412 revolutions 
per minute- It is a multi-pole variable condenser with 16 sets of stationary 
plates and a rotor whose plates mesh with the stationary ones. Figure 30 
shows the construction of the scanner , with two sets of plates removed to show 
the rotor- 
Signals coming from the vibrato line appear on the stationary plates and are 
picked up, one at a time, by the rotor. Connection to the rotor is made by 
carbon brushes as shown in Figure 30. Two brushes touch the sides of the con- 
tact pin and a third presses on the end, in order to eliminate the possibility 
of contact failure. 

The complete electrical circuit of the vibrato system is shown in the schematic 
diagrams contained in the back of this manual- 

PRESET TABS CM- 1 00) 

Four tabs are provided for each manual. As indicated, they provide a choice of 

using the drawbars or playing the preset tones indicated on them. 

REVERBERATION AND VOLUME SOFT TABS CM- 1 00) 

Several degrees of reverberation are obtained by the use of either or both tabs 
labeled ''Reverberation I" and "Reverberation II", These tabs in addition to 
turning this feature on, govern the loudness or amount of reverberation by a re- 
sistive network used in conjunction with the speaker. The "Volume Soft" tab 
controls the overall volume of the organ and is especially useful where playing 
might disturb others . 

AMPLIFIER ASSEMBLY 

In the M and M-2 models, the amplifier assembly is on a single chassis, but is 
actually composed of four sections: Manual, Pedal, Intermediate, and Output , as 
indicated in the block diagrams, figures 8 and 9, and in the schematics in the 
schematic section of this manual. 



12 



In the M-3 and M-lOO models there is one additional section, the percussion 
amplifier. The block diagrams appear in Figures 10 and 11, 

The M-lOO model alone has one additional amplifier assembly, the Reverberation 
Amplifier. This separate amplifier is used to secure the Reverberation effect 
in conjunction with the Reverberation unit. This amplifier has its own speaker, 

MANUAL SECTION OF AMPLIFIER MODEL M 

The manual section, composed of tubes VI and VZ, receives its signal from the 
matching transformer Tl. The "special input" jack, connected through a net-- 
work to the cathode of VI, provides a low impedance input circuit (see "Special 
Equipment")* Some treble attenuation is provided by a feedback network con^ 
sisting of C2, R2, and R3, connected from cathode follower tube V2 to the in- 
put of VI, The output signal obtained from the cathode of V2 drives the vibrato 
line (see "Vibrato system") and the manual signal, after passing through the 
vibrato system, is combined with the pedal signal at the grid of V3. 

MODEL M-2» M-3 
The manual section is composed of two channels connected to the "Vibrato" and 
"no Vibrato" input terminals. Either of the two matching transformers can 
feed a signal into either input channel, depending on whether the correspond- 
ing control tablet is set for Vibrato "on" or "off". 

Signals entering the "no Vibrato" channel (tube V2) are amplified and fed 
directly into the intermediate section of the amplifier while signals going 
into the "Vibrato" channel (tubes VI and V3) pass through the Vibrato system 
first- The output signal of the Vibrato system is combined with the "no Vi- 
brato", Percussion^ and Pedal signals at the grid of the intermediate ampli- 
fier. 

Suitable tonal balance is secured in the "no Vibrato" channel by a feedback 
network connected from plate to grid of V2. Similar tonal balance is provided 
in the "Vibrato" channel by a feedback network connected from cathode follower 
V3 to the gird of VI- The two channels are matched by selecting R27 (M-3), and 
R20 (M-2) at the factory- 

M-100 

The manual section is composed of two channels connected to the "Vibrato" and 
"no Vibrato" input terminals- Either of the two matching transformers can feed 
a signal into either input channel, depending on whether the corresponding con- 
trol tablet is set for vibrato "on" or "off". 

Signals entering the "no Vibrato" channel (tube V2) are amplified and fed dir- 
ectly into the intermediate section of the amplifier, while signals going into 
the "Vibrato" channel (tubes VI and V3) pass through the Vibrato system first. 
The output signal of the Vibrato system is combined with the "no Vibrato" and 
pedal signals at the grid of the intermediate amplifier. 

Suitable tonal balance is secured in the "no Vibrato" channel by a feedback net- 
work consisting of C6, R12, R13 and R13A connected from plate to grid of V2. 
Similar tonal balance is provided in the "Vibrato" channel by a feedback network 
including CI, Rl, R2, and R2A connected from cathode follower V3 to the input 
of VI. The two channels are matched by selecting R20 at the factory. 



13 



PEDAL SECTION OF AMPLIFIER - Mi M-2i M-3 

The pedal amplifier, composed of one tube, V7, receives its signal directly from 
the pedal generators. When a pedal key is pressed its "pedal contact" opens, 
delivering a signal voltage of the proper frequency to the grid of V7, The note 
cannot sound instanly, however, because the tube is normally cut off by a nega- 
tive 21 volt grid bias. 

Near the end of the pedal stroke the "pedal keying contact" (common to all ped- 
als) closes. This shunts a resistance from the bias point to ground, discharg- 
ing the bias condenser C57 and allowing the note to sound. 

If "pedal attack" is at "normal" only a single resistor R68 is placed across 
the bias condenser when the pedal keying contact closes. This very quickly dis- 
charges the condenser, and the note sounds quickly, although not abruptly. 

In case "pedal attack" is set at "slow"^ the shunting resistor is increased by 

the addition of R69 and so the bias condenser cannot discharge as quickly- It 

takes an appreciable time, therefore, for the bias to drop low enough so that 
the note sounds . 

When the pedal key is released, the pedal keying contact opens, allowing cutoff 
bias to be applied again to the tube. With "pedal decay" set at "fast" this 
occurs rapidly, since R74 charges C57 in a short time. With "pedal decay" set 
at "normal" the increased resistance delays the charging of C57 and permits the 
tone to sound for a longer time. 

If the "pedal sustaining control" is operated (lever on expression pedal pressed 
to left), an additional resistor R76 is introduced. This delays the charging 
of C57 still further and causes the note to sound for a much longer time. 

A latching mechanism holds the last-played pedal contact open until some other 
pedal is operated, in order to Insure that the correct note will sound through- 
out the decay period. 

The pedal cutoff adjustment R73 varies the screen voltage of the pedal ampli- 
fier tube. It must be adjusted so that the pedal tone is just inaudible with 
the pedal drawbar and expression pedal set in loudest position, as instructed 
in "Practical Service Suggestions". 

M-lOO 

The pedal amplifier, composed of one tube, VIO, receives its signal directly 
from the pedal generators- When a pedal key is pressed its "pedal cqntact" 
opens, delivering a signal voltage of the proper frequency to the grid of VIO. 

+ 

The note cannot sound instantly, however, because the tube is normally cut 
off by a negative 22 volt grid bias. 

+ 

Near the end of the pedal stroke the "pedal keying contact" (common to all 
pedals) closes. This shunts a resistance from that bias point to ground, dis ^ 
charging the bias condenser C57 and allowing the note to sound. 

When the pedal key is released, the pedal keying contact opens, allowing cut- 
off bias to be applied again to the tube. With the pedal "Fast Decay" tab de- 
pressed this occurs rapidly, since R81 charges C57 in a short time. With the 
tab up, the increase resistance delays the charging of C57 and permits the tone 
to sound for a longer time. 

14 



If the "Pedal Legato" stop Is depressed, an additional resistor R82 is introduced. 
This delays the charging of C57 still further and causes the note to sound for a 
much longer time. 

A latching mechanism holds the last-played pedal contact open until some other 
pedal is operated, in order to insure that the correct note will sound throughout 
the decay period. 

The "Bass Mute" tab varies a filtering circuit in the VIO tube output so the 
higher frequencies are bypassed to ground, giving a deeper tone to the pedals. 

The pedal cutoff adjustment R85 varies Che bias voltage of the pedal amplifier 

tube. It must be adjusted so that the pedal tone is just inuadible with the pedal 

drawbar and expression pedal set in loudest position, as instructed in "Practical- 
Service Suggestions. " 

To prevent a pedal note from sounding when the organ is first turned on, a re- 
sistance of five ohms inserted in series with the heater of the pedal amplifier 
tube lengthens its warm-up time so that the cutoff bias is applied before the 
tube is conductive. 

INTERMEDIATE SECTION OF AMPLIFIER 

From the plate of the pedal amplifier tube the pedal signal passes through a 
variable air condenser (operated by the pedal drawbar) to the intermediate 
amplifier (half of V3)(M), V4 (M-2, M-3, M-lOO) . At this point the pedal signal 
is mixed with the vibrato, non-vibrato, and percussion signals from the manuals 
(M-3, M-lOO). 

Depressing the "Volume Soft" tab reduces the overall volume of both manuals 
and pedals by shunting a small condenser across the input of the intermediate 
amplifier. At the same time it provides pedal compensation by adding R65 in 
series with the pedal generators and thereby increasing the relative volume 
of the pedals- 

The small feedback condenser from plate to grid of the intermediate amplifier 
is a means of increasing the effective input capacity of the tube. In this cir- 
cuit the effective input capacity is this value multiplied by the amplification 
factor of the tube, or a total of about 1500 micromicrof arads , This provides 
a suitable load for the output of the scanner and the pedal drawbar, 

The combined manual and pedal signals go through the intermediate amplifier 
to the expression control (operated by the expression pedal), which is a special 
variable air condenser with a single set of movable plates and two sets of 
stationary plates. With the expression pedal in "loud" position the signal is 
transitted directly to the grid of the following tube, while in "soft" position 
the signal goes through a tone^compensated attenuating network. At inter- 
mediate positions the signal is obtained from both sources, providing con- 
tinuously variable control, 

OUTPUT SECTION QF AMPLIFIER (M) 

V4 is a common-cathode-impedance phase inverter driving push-pull output tubes 
V5 and V6* The second grid of V4 provides a radio-phonograph input channel (see 
"Special Equipment"). A small feedback condenser from voice coil to grid of V4 
makes the pedal response more uniform by reducing speaker resonance. (In model 
M consoles below serial number 3000, with amplifiers marked type M-A, this feed- 
back connection is not used; C46 is omitted, C37 is omitted, C42 is .00135 mfd,, 

15 



and T2 does not have a secondary center tap) 



M-2i M-3 



The second half of V3 is a phase inverter driving push-pull output tubes V5 and 
V6. A small feedback condenser C22 Cm-2), C23 (M-3) from voice coil to grid of 
V4 makes the pedal response more uniform by reducing speaker resonance. This 
condenser (located in the expression control unit) is variable and is adjusted 
at the factory. 

M-lOO 

The second half of V3 is a phase inverted driving push-pull input tubes V5 and 
V6, which in turn drive two 16 ohm speakers connected in parallel, A small 
feedback condenser C23 from output transformer secondary to grid of V4 makes 
the pedal response more uniform by reducing speaker resonance. This condenser 
(located in the expression control unit) is variable and is adjusted at the 
factory. 

PERCUSSION SECTION OF AMPLIFIER 

The 2nd or 3rd harmonic signal (M-3) or both (M-lOO) (depending on position of 
the harmonic selector tabs) is conducted through the percussion matching trans- 
former and amplified by tube V7. The resistive feedback on this tube provides 
proper loading on the matching transformer to fix the primary impedance at 
about 5 ohms. This provides a volume compensating effect so that the per- 
cussion output signal is about the same whether one key or several are played. 
Besides providing push-pull signal for the control tube (V9), transformer T5 
has another winding which feeds signal to the 2nd or 3rd harmonic drawbar 
through equivalent key circuit resistors. 

The control tube (V9) is normally conducting, so when a key is pressed the second 
or third harmonic percussion signal first sounds loudly. It passes through the 
control tube, transformer T6, a band pass filter network, and terminal D to the 
grid of V4, 

Imrr.ediately the note begins to fade away, giving the characteristic percussion 
effect. This fading Is accomplished as follows: When the percussion switch is 
"on'', terminal K (normally held at plus 25 volts through anti-spark resistor 
(R-53) is connected to the solo manual 6th, (8th in M-3) harmonic busbar* When a 
key is pressed, terminal K is grounded through the key contact and the tone gen- 
erator filter. This virtually grounds the plate of V8 (connected as a diode), 
open-circuiting the tube and isolating the control tube grid circuit. The grids 
then drift from their operating potential of about plus 25 volts to a cut-off pot- 
ential (about plus 15 volts) at a rate determined by the time required for 031 to 
discharge through R59 and R60- 

The percussion signal is now blocked. No percussion notes can sound until all 
keys of the solo manual are released and the control grids again rise to plus 25 
volts. The time of this rise (that is, how quickly the control tubes turn on again 
after a key is released) is the time required to change C31 to plus 25 volts 
through R57 and R58. 



"^ 



16 



When the percussion Second Harmonic" or Third Harmonic" (>i-3) or both (M-lOO) 
tabs are down, the corresponding upper manual harmonic drawbars are disconnect- 
ed from their lead wires and these wires (which come from the manual busbars) 
are connected to the percussion matching transformer. The 6th harmonic (M^lOO) 
or 8th (M^3) drawbar is also disconnected from its lead wire and this wire 
(which is grounded through the generator magnets when any key is pressed) is 
used to turn off the push-pull control tube. Therefore, the 6th harmonic (M-lOO) 
or 8th (M-3) is not available on the upper manual when the percussion is in use. 

When the "Percussion Soft" tab is depressed, it reduces the volume by shunting 
resistor R50 across the percussion output transformer. 

The percussion "Fast Decay" tab determines how fast the sound fades away after 
a k-ey is pressed. When a key is pressed with the tab up, resistor R60 dis- 
charges capacitor C31, reducing the D,C. voltage on the control tube grids to 
cutoff in about 2-1/2 seconds. When the tab is pushed down another resistor 
is shunted across the original resistor R60, reducing the time to discharge 
capacitor C31 and thereby reducing the D.C. voltage on the control tube grids 
to cutoff in less than 1/2 second. To preserve about the same effective loud- 
ness between "slow" and "fast" decay settings, shunt resistor R62 is disconnected 
when the decay tab is in "fast" position. This reduces the effective control 
tube bias and thus increases the loudness. 

With the "Second Harmonic" tab depressed, the upper manual 2nd harmonic draw- 
bar wire is connected to the percussion matching transformer and a signal is 
fed back to the 2nd harmonic drawbar- With the "Third Harmonic" tab depressed 
the upper manual 3rd harmonic drawbar wire is connected to the percussion 
matching transformer and a signal is fed back to the 3rd harmonic drawbar. 
Both tabs can be used at the same time in the M-lOO, however in the M-3, only 
one or the other is available. 

POWER SUPPLY (ALL MODELS) 

The power supply uses a 5U4 rectifier tube with a conventional filter circuit. 

TUBE SOCKET VOLTAGES 

Voltages shown on the schematics are taken with a 20,000 ohm-per-volt meter. 

Line variations may cause up to 20% variation in the indicated voltages. 

To make tube sockets accessible, remove lever from shaft of expression unit on 
amplifier; loosen cable clamp on lower shelf; remove four amplifier mounting 
screws and turn amplifier upside down, being careful not to rest on expression 
unit lever. The tabs and expression lever may be in any position, and no key 
should be depressed unless specified, 

REVERBERATION AMPLIFIER (M-lOO) 

When either "Reverberation I," "Reverberation II," or both are used, the music 
played will be reverberated. This reverberation signal is in addition to the 
normal sound produced through the two 12" speakers connected to the main ampli^ 
f ier • A separate amplifier and speaker are incorporated in the instrument for 
this purpose, 

A signal from the voice coil terminals of the regular speakers in the console 
goes through a resistor network and two Incandescent lamps to the drive coils 
of the reverberation unit, as shown under "input to reverberation unit" in the 
s chema tic d ia g ram . 



17 



The incandescent lamps are used as volume limlters or volume compression cir- 
cuit. When the organ is played loudly, the lamp filaments become hot and In- 
crease in resistance, and, therefore, the amount of signal furnished to Che 
reverberation unit does not increase as fast as the volume of the no-rever- 
berated signal. This is a desirable musical effect, since a greater proportion 
of reverberated signal is needed at low volume levels. 

The drive coils introduce vibration in two coil springs. These vibrations 
bounce hack and forth in the coils springs to simulate natural echoes of sound, 
in a large room. Pickup coils at the other end of the two springs drive the 
input of the amplifier. The amplifier output drives an 8 ohm 8" speaker. 

SPECIAL EaUIPMENT 

RADIO. PHONOGRAPH. OR MICROPHONE 

A phonograph, radio, or microphone amplifier will play through the organ speak- 
er if connected to the pin jack marked "RADIO-PHONO" located on the expression 
control unit of the organ amplifier. The device should have an output level 
of about 1/2 volt maximum, and must have its own volume control, as neither the 
expression pedal nor the "Volume" tablet will affect it. The organ may be play- 
ed at the same time. 

In the Model M only, occasionally for special effects it may be desirable to 
apply vibrato to the signal from a phonograph, radio or microphone. In this 
case connect to the pin jack market "SPEC-INPUT". This point has a low imped- 
ance to ground (about 7000 ohms) and may conveniently be driven from the voice 
coll terminals of an amplifier having a level of about 5 volts maximum. The 
expression pedal, "volume" tablet, and three vibrato tablets will then be ef- 
fective on the input signal just as they are on the organ music. 

EXTENSION SPEAKER 

An additional speaker, of the permanent magnet dynamic type, may be attached 
to the organ if special circumstances make it desirable. It should be con- 
nected to the two voice coil terminals on the amplifier. It is essential that 
the speaker be at least 10" in diameter and be mounted in an adequate baffle 
to bring out the organ pedal notes properly. The console speaker voice coil 
wires may be left connected or not, as desired. 

Hammond Organ tone cabinets may be used as extension speakers. A kit for mak- 
ing the necessary connections can be secured from your dealer. 

EAR PHONE (MONAURAL) 

Ear phones may be connected to the organ if someone wishes to practice without 
disturbing others. They will generally give adequate volume when connected to 
the^ voice coil" terminals of the amplifier, with the speaker disconnected. A 
resistor of 6 to ID ohms, with power rating not less than 10 watts must be con- 
nected across these terminals whenever the speaker is disconnected. 



18 



EAR PHONE (STEREO) 

Stereo ear phones can give pleasing results when attached as shown in the sch- 
matic below. A separate two pole double throw switch is required in addition to 
the listed resistors and jack. Use of good quality ear phones made by David 

Clark, Koss, or Telex are recommended and can be secured from any parts supply 
house. 



GN. 



T^J 



Organ Spk, wires 



BLK, 




CN, ©- 



Rev, Spk. wires 



BLK- *■ 




£:-3 



100 -a 




10 jo. 
10 W 



SPECIAL POWER SOURCES 

The organ must always be connected to an alternating current source of the 
voltage and frequency specified on the name plate. If the only available power 
source is direct current or has a frequency different from that specified, it 
will be necessary to provide a converter or motor generator of at least 170 
watts capacity. 



PRACTICAL SERVICE SUGGESTIONS 

ORGAN DOES NOT PLAY 

(a) If the starting motor does not operate when the "Start" switch is pressed 
and If the tubes do not light with the'^Run'' switch on, check the power 
wiring, power switch, line cord, line cord plug, and wall outlet. 



(b) 



If the generator turns and the tubes light, but no sound can be obtained 
with all controls in playing position, the most likely source of trouble 
is the amplifier. In most respects this is a conventional amplifier 
circuit, and the schematic diagrams will enable the service man to lo- 
cate the trouble. 



ONE KEY DOES NOT PLAY OR A HARMONIC IS MISSING 

(Tests to be made with "Drawbars" tab depressed) 

This may mean a dirty key contact, a broken connection, or a dead note in the 

generator. The steps below will serve to isolate the trouble- 

(a) Ordinarily only one of the several frequencies used on the key will be 
missing. This can be determined by holding the key and operating each 
drawbar for that manual, observing on which drawbar the key falls to play 
Reference to the manual wiring chart, figure 18 will tell which frequency 
number is missing. 

(b) See whether the same frequency is missing where it is used on other keys 
of the same manual. The wiring chart will tell with what other key and 



19 



what other drawbar you should get the same frequency. If It is missing 
on one key but not on others, a key contact is probably dirty. In some 
cases it may be cleared by striking the key 15 or 20 times in a rapid 
staccato manner to loosen the dirt. If this procedure is not effective, 
adjustment of the busbar shifter for that manual will clear it, (See 
"manuals" section on a prior page for location and manner of adjustment). 
This will slide the busbars endwise so they present a clean contact sur- 
face. In extreme cases, it may be necessary to hold down the faulty key 
while making the adjustment, 

(c) If the frequency is missing on all keys of one manual but not on the other 
manual, look for a break in the cable connecting one manual to the other. 

(d) If the frequency is missing on both manuals, check the manual-to-generator 
cable or the generator itself. 

(e) The output of any signal frequency on the tone generator may be checked 
by pulling out any drawbar and connecting a clip lead from the back end 
of the drawbar to the generator terminal in question. See Figures 14, 
15, and 16 for location of all generator terminals. If the generator 
Is all right, the note will play loudly. 

CAUTION; Never test the tone generator with an outside source of current 
such as a continuity meter, as serious damage may result to the sensitive 
filter transformers and permanent magnets. By the above method, all 
necessary tests of the tone generator may be made with the current sup^ 
plied by the generator itself. 

(f) If it fails to play, try touching the clip to the input side of the filter 
coil (not the grounded tap) and the input side of the filter condenser 
(Figures 14, 15 and 16) in order to check these parts. Disconnect the 
condenser to eliminate the possibility of a grounded transformer . If 

the signal is still missing at the magnet coil terminal, it means that 
the tone wheel is not turnings the coil is defective, or the magnet is 
not properly adjusted. 

(g) If the tone wheel is not turning^ the frequency of the other wheel on 
the same shaft will also be missing (with the exception of a few wheels 
which are alone). On the generator magnet location drawing (Figure 13), 
the two frequencies whose numbers are connected by a dotted line are on 
the same shaft. Antoher way to check the wheel is to raise the generator 
slightly and feel the wheel with your finger to see if it is turning. Each 
wheel is located directly behind its magnet, shown in Figure 13. 

(h) If the magnet coil is defective, the generator must be returned to the 

factory, as replacement of a coil necessitates dismantling the entire 

generator, 
(i) It is possible, although unlikely, that the magnet may have become loose 

and moved so far from the wheel as to make the not inaudible. It may 

be adjusted as described in the following paragraph. 

ONE NOTE IS WEAK 

(a) Trace the note as described in the preceding section to see whether 
weakness is due to dirty contact, poor connection, defective filter or 
reduced output of magnet coil. Check at each point by comparing inten- 
sities with higher and lower frequency numbers. 

(b) It is possible that one or more notes may be acoustically weak, due to the 
room and the furnishing, although the actual signal level is equal to that 
of adjacent notes. This can be checked by reading voltages of the various 
notes on an output meter connected to the voice coil terminals on the ampli- 
fier. All notes will not give equal output, but voltage should vary smoothly 
from note to note. In this test variations of less than 30% should be ignored 

20 



(c) Each magnet is set at the factory by tapping it gently, with the set screw 
partially loosened, while observing an output meter. Experience has shown 
that the magnets seldon need adjustment and that setting them without 
proper equipment involves danger of damaging both magnet and wheel. 
Therefore, it is not recommended that the service man attempt this adjust- 
ment. 

PERCUSSION NOTES WEAKt DO NOT PLAYi OR DO NOT DECAY PROPERLY 

(a) Adjust percussion cutoff control; with expression pedal wide open, 
"Volume Soft" tab up, upper "Drawbars" tab down, all drawbars pushed in, 
press "Third Harmonic" and "Fast Decay" tabs. Hold down first C key on 
upper manual and adjust percussion cutoff control to the exact point of 
cutoff or silence, 

(b) Check tubes V7, V8, V9- 

(c) Always adjust percussion cutoff control after replacing V9 C12AU7). 

PEDAL NOTE SOUNDS AT FULL VOLUME (WHEN PEDAL IS NOT BEING PLAYED) 

(a) It is possible to make a black pedal lock down and play continuously by 
striking it very hard at an angle so that it moves sidewise as well as 
downward. This will never occur if the pedals are used properly, as 
only slight pressure with the toe is required for playing. 

(b) A pedal locked down in this way will remain visibly depressed and tilted. 
It can be released by pressing it down very hard, with a slight pressure 
opposite to the direction of tilt. No permanent damage will result. 

PEDAL NOTE SOUNDS FAINTLY (WHEN ORGAN IS NOT BEING PLAYED) 

In this case the pedal cutoff control may be adjusted as follows: 

(a) Set expression pedal wide open, pull pedal drawbar to its loudest position, 
and leave three pedal tabs up. 

(b) Play highest pedal key and then release it. Wait at least 15 seconds for 
pedal note to die away. 

(c) Slowly turn pedal cutoff adjustment (on face of amplifier) clockwise 
until pedal note just disappears. Do not turn it any farther. 

(d) Always recheck this adjustment when replacing the 6BA6 tube. 

HUM 

(a) A loud 60 cycle or 120 cycle hum in the speaker may come from some near- 
by electrical appliance, as explained on the instruction card. It may be 
picked up by the matching transformer, the vibrato line, or the console 
wiring. Hum from this source will disappear if you ground the signal 
input terminals on the amplifier to the chassis. It may be eliminated by 
moving either the console or the appliance. 

(b) The faint pedal note heard when the pedal cutoff adjustment needs setting 
may sometimes be mistaken for hum. Check it as described under "Pedal 
note sounds faintly when organ is not being played. 

(c) Any other hum must originate in the amplifier circuit, and can generally 
be cured by replacing one or more of the electrolytic condensers. 

(d) In case hum originates in the amplifier but is not due to the electrolytic 
condensers, its source can be isolated by successively removing tubes or 
by grounding successive points in the signal circuit , 



21 



REPLACING TUBES 

(a) The vacuum tubes are all standard radio types and can be tested in the 
usual way. 

(b) If the 6BA6 tube is replaced, check the pedal cutoff adjustment as ex- 
plained under "Pedal note sounds faintly when organ is not being played", 

(c) If tube V9 is replaced, check percussion cutoff adjustment as explained 
under "Percussion notes weak, do not play, or do not decay properly". 

PROCEDURE FOR REMOVING PARTS IN NEED OF REPAIR OR REPLACEMENT 

TO REMOVE KEY FROM UPPER MANUAL (Mi M-2i M-3) 

(a) Remove music rack by unscrewing thumb screw, unhooking brace, and lifting 
it from console. 

(b) Remove music rack base by taking out two screws in upper manual end blocks, 

(c) Remove metal angle fastened across keyboard by two screws - 

(d) To remove a black key loosen its key mounting screw (See Figure 3), unhook 
key from screw and lift out key. 

(e) To remove a white key loosen its key mounting screw and those of adjacent 
black keys. Unhook these keys from screws, push them back, and lift out 
white key, 

M-lOO 

(a) Remove music panel and top. 

(b) Remove four screws which secure metal cover on control panel assembly, 

(c) Remove two large screws located at ends of control assembly, which secure 
It to upper manual. 

(d) Pull out drawbar on extreme left and fold control assembly back, 

(e) To remove a black key, loosen its key mounting screw (See Figure 7), un- 
hook key from screw and lift out key. 

(f) To remove a white key, loosen its key mounting screw and those of adjacent 
black keys. Unhook these keys from screws, push them back, and lift out 
white key. 

TO REMOVE A KEY FROM LOWER MANUAL (Mi M-2i M'3) 

(a) Remove music rack by unscrewing thumb screw, unhooking brace, and lifting 
it from console. 

(b) Remove music rack base by taking out two screws in upper manual end blocks- 

(c) Detach pedal volume control (Figure 3) by removing two machine screws, loosen- 
ing wood screw which holds friction clip to top of console, and unhooking from 
drawbar. 

(d) Remove upper manual mounting bolts "A" and "B" under keyboard (Figure 33) 

(e) Place a 3/4" board under each upper manual chassis mounting block; this will 
hold up upper manual sufficiently to make lower manual key mounting screws 
accessible, 

(f) To remove a black key loosen its key mounting screw (See Figure 3), unhook 
key from screw and lift out key. 

(g) To remove a white key loosen its key mounting screw and those of adjacent 
black keys. Unhook these keys from screws, push them back, and lift out 
white key, 

M-lOO 

(a) Remove music panel and top 

(b) Remove generator dust cover by taking out seven screws from edge of gener- 
ator shelf and loosening four screws in cover just below upper manual assembly 

(c) Remove upper manual mounting bolts (2) which are located at ends of console 
directly above front corners of generator. 

(d) Remove two screws which pass through angle brackets into upper manual. 



22 



mounted on inside of cheek blocks. These screws are accessible from 
front of organ. 

(e) Tilt manual from front, being careful that It does not slip back. 

(f) Using 1/4" box ratchet, loosen key mounting screw, 

(g) To remove a black key, loosen its key mounting screw (see Figure 7), un- 
hook key from screw and lift out key. 

(h) To remove a white key loosen its key mounting screw and those of adjacent 
black keys. Unhook these keys from screws, push them back, and lift out 
white key. 

TO REMOVE A DRAWBAR CONTACT SPRING (Mj M-2i M-3) 

(a) Push drawbar all the way in- 

(b) Remove screw and nut at back end of drawbar (Figure 3). 

(c) Pull out contact spring while pressing with thumb to release pressure on 
contact. To disconnect spring entirely, unsolder wire. 

(d) Do not under any circumstances pull drawbar forward while contact spring 
is off, as damper spring will catch in slot and ne'cessitate removal of 
entire drawbar assembly . 

M-lOO 

(a) Remove music panel and top. 

(b) Remove four screws which secure metal cover on control panel assembly, 

(c) Pull out contact spring while pressing with thumb to release pressure on 
contact. To disconnect spring entirely, unsolder wire. 

(d) Do not under any circumstances pull drawbar forward while contact spring 
is off, as damper spring will catch in slot and necessitate removal of 
entire drawbar assembly. 

TO REMOVE A DRAWBAR OR DRAWBAR KNOB (Mi M-2i M-3) 

(a) Remove music rack by unscrewing thumb screw, unhooking brace, and lift- 
ing it from console, 

(b) Remove music rack base by taking out two screws in upper manual end blocks 

(c) Remove 8 hexagonal head machine screws holding drawbar assembly and one 
screw fastening angle across upper manual keys , 

(d) To remove knob , pull drawbar assembly toward front of console (be care- 
ful not to scratch control panel surface) , prop it up, and remove screw 
which holds knob . 

(e) To remove drawbar and contact spring, pull them out at back of assembly, 
while pressing with thumb to release pressure on contact. 

(f) To separate drawbar from contact spring remove screw and nut at back end 
of drawbar. 

M-lOO 

(a) Remove music panel and top. 

(b) Remove four screws which secure metal cover on control panel assembly. 

(c) Remove two large screws located at ends of control assembly which secure 
It to upper manual (Pull out drawbar on extreme left) and fold back. 

(d) Remove 4 hexagonal head machine screws holding drawbar assembly, 

(e) To remove knob, pull drawbar assembly toward front of console (be care- 
ful not to scratch control panel surface) , prop it up, and remove screw 

which holds knob. 

(f) To remove drawbar and contact spring, pull them out at back of assembly, 

while pressing with thumb to release pressure on contact, 

(g) To separate drawbar from contact spring remove screw and nut at back end 
of drawbar - 



23 



TO REMOVE UPPER MANUAL (Mi M-2i M-3) 

(a) Remove music rack by unscrewing thumb screw, unhooking brace, and lifting 

it from console . 

(b) Remove music rack base by taking out two screws in upper manual end blocks. 

(c) Remove dust cover over generator by taking our seven screws from edge of 
generator shelf and loosening four screws in cover just below upper manual 
assembly - 

(d) Detach control panel by removing 6 machine screws from top of panel, and lay 
panel on generator, being careful not to damage generator wiring. Control 
panel wires need not be disconnected. 

(e) Detach pedal volume control (Figure 3) by removing two screws which hold it 
and loosening wood screw which holds friction clip to top of console; unhook 
control from drawbar and lay it on generator, being careful not to damage 
generator wiring. Volume control wires need not be disconnected, 

(f) Remove two screws fastening matching transformer bracket to upper manual, 
take off round cover held by two screws, unsolder and detach shielded wires 
and black wire from transformer, 

Cg) Re-attach matching transformer to upper manual. 

(h) Unsolder wires from lower manual drawbars. 

(i) Remove upper manual mounting bolts "A" and "B" under keyboard (Figure 33). 

( j ) Remove the two upper manual stop plates, held by two wood screws (Figure 3). 

(k) Prop up front of upper manual so that its terminal strip is accessible. Be 
careful when raising and lowering manual that its terminal strip is not dam- 
aged by rubbing lower manual keys , 

(1) Unsolder manual cable from terminal strip. Lower manual into normal position, 

(m) Detach vibrato line box by removing two screws in sides of box fastening it 
to underside of console top; lay line box on top of generator, being careful 
not to damage wiring on generator. Line box wires need not be unsoldered 
(early M-3 only) , 

(n) Where line box is of metal construction unsolder wires from scanner leaving 
it attached to manual. 

(o) Carefully lift manual assembly (including drawbars and matching transformer) 
out through back of console, 

(p) Remove metal angle fastened across keyboard by two screws. 

(q) Take out 8 hexagonal head machine screws from drawbar assembly and carefully 
lift off drawbar assembly and matching transformer assembly. 

M-lOO 

(a) Remove music panel and top, 

(b) Remove four screws which secure metal cover on control panel assembly. 

(c) Remove two large screws located at ends of control assembly which secure 
it to upper manual. 

(d) Remove generator dust cover by taking out seven screws from edge of gen- 
erator shelf and loosening four screws in cover just below manual assembly, 

(e) Remove two manual ho Id- down bolts located at ends of console directly above 
front generator corners - Reinstall dust cover temporarily, 

(f) Remove two screws fastening matching transformer bracket to upper manual, 

(g) Detach pedal volume control by removing two screws which hold it to manual 
assembly. Unhook control from drawbar and lay it on generator cover. " 
Volume control wires need not be disconnected , 

(h) Remove vibrato line box by taking out four screws attaching it to rear of 

upper manual. 
(i) Remove screws holding four plastic clamps containing wiring. 



24 



C j ) Locate nine coded wires coming from busbars inside manual, Tehse are 

found at right rear of manual. Trace this troup of wires to upper manual 

preset tabs and unsolder. Note location and routing as shown on wiring 

diagram and in console- 
(k) Take out four hex head machine screws from drawbar assembly. 
(1) Entire control panel, drawbar assembly, line box, pedal volume control 

and matching transformer can now rest on generator cover. 
(m) Reinsert two bolts which held the control assembly to the manual assembly, 
(n) Remove two screws which pass through angle brackets into upper manual. 
Co) Prop up front of upper manual so that its terminal strip is accessible. 

Be careful when raising and lowering manual that its terminal strip is 

not damaged by rubbing lower manual keys- 
(p) Unsolder manual cable from terminal strip. Lower manual into normal 

position- 
(q) Carefully lift manual assembly out of console. 

t 

TO REMOVE LOWER MANUAL (Mi M'2» M-3) 

(a) Remove music rack by unscrewing thumb screw, unhooking brace, and lifting 
it from console. 

(b) Remove music rack base by taking out two screws in upper manual end blocks. 

(c) Remove dust cover over generator by taking out seven screws from edge of 

generator shelf and loosening four screws in cover just below upper manual 
assembly. 

(d) Loosen wood screw holding friction clip of pedal volume control (Figure 
3) to top of console, 

Ce) Remove upper manual mounting bolts "A" and "B" under keyboard. (Figure 33) 

(f) Prop up front of upper manual as far as possible. Be careful when raising 
and lowering upper manual that its terminal strip is not damaged by rugging 
lower manual keys. 

(g) Remove two hexagonal head mounting bolts from rear end of lower manual 
chassis mounting blocks. 

(h) Remove three screws X, Y, Z under keyboard (Figure 33). 

(i) Remove lower manual end blocks by taking out screws C, D, E, and F under 

keyboard (Figure 33) , 
(j) Unsolder manual cable wires from terminal strip, 
(k) Lift manual out through front of console, being careful not to damage 

woodwork. 

M'lOO 

(a) Remove screws holding four plastic clamps containing wires, on rear of 
upper manual. 

(b) Locate nine coded wires coming from busbars inside of lower manual- These 
are found at right rear of manual. Trace this group of wires to lower 
manual preset tabs and unsolder. Note location and routing as shown on 
wiring diagram and in console. 

(c) Prop upper manual from front, being careful it does not slip back. 

(d) Remove both lower manual end blocks, by removing two screws through man- 
ual frame and one screw through bracket in check block. 

(e) Remove lower manual terminal cover, hedl by four screws under keyboard. 

(f) Remove two hex bolts which secure lower manual to case. 

(g) Loosen (don't r^tnove) four hex screws holding front of lower manual to 
front rail of case. 

(h) Lif t out lower manual . 



25 



TO DETACH AND OPEN CONTROL PANEL (Mi M-2» M-3) 

(a) Remove dust cover over generator by taking out seven screws from edge of 
generator shelf and loosening four screws in cover just below upper man- 
ual assembly- 

(b) Remove six machine screws from top of panel. Control tablet box may now 
be lowered and pulled toward rear of console. 

(c) Lay box upside down on generator (being careful not to damage wiring on 
generator) and remove bottom cover by taking out four screws. Care should 
be taken not to pull the wires or cables excessively during this pro- 
cedure. None of the wires or cables need be disconnected. 

TO DETACH A^a3 OPEN PERCUSSION CONTROL SWITCH (M-3 ONLY) 

(a) Remove screws C and D under keyboard (Figure 33) . 

(b) Remove four fastenings holding panel to wood block. 

(c) Turn tablet assembly upside down and remove bottom cover by taking out 
two screws . Wires need not be disconnected . 

TO REMOVE GENERATOR <Mt M-2» M-3j M-IOO) FIRST PULL OUT LINE PLUG 

(a) Remove dust cover over generator by taking out seven screws from edge 
of generator shelf and loosening four screws in cover just below upper 
manual assembly, 

(b) Unsolder, at line panel, six wires (5 wires on M, M-2, M-3) to running 
and starting switches . 

(c) Unsolder, at line panel, three wires to amplifier, 

(d) Unsolder pedal and manual cables from generator, 

(e) Disconnect scanner shielded wire from amplifier terminal. 

(f) Unsolder cable of six green wires from scanner terminals. 

(g) Unsolder scanner wires from terminals 3, 4, and 5 (12, 13, and 14 on M, 
M^2, M-3) on vibrato line box. 

(h) Unsolder two black wires from generator cover near start motor end, 
and also grey wire (connected to junction of two carbon resistors on 
generator cover) , 

(i) Remove 4 generator hold down screws (4 cotter pins from clamping screws 
and remove screws on M and M-2). 

( j ) Unhook four suspension springs from generator. 

(k) Carefully lift out generator. 

TO REMOVE STARTING MOTOR (Mt M-2> M-3i M-lOO) FIRST PULL OUT LINE PLUG 

(a) Remove dust cover over generator by taking out seven screws from edge 
of generator shelf and loosening four screws in cover just below upper 
manual assembly. 

(b) Remove oiling threads (tied to two motor bearings) from oil trough by 

pulling or cutting them, (When replacing threads be sure they go under 
felt in trough) . 

(c) Provide more slack in lead wires at starting motor by pulling wires 
carefully, 

(d) Unscrew two hexagonal studs extending beyond outer edge of motor. 

(e) Lift motor out and unsolder its lead wires- (Be careful to remove and 
replace all threads). 

TO REPLACE PILOT LIGHT (M-lOO ONLY) 

(a) Remove music panel and top. 

(b) Remove four screws which secure metal cover on control panel assembly. 

(c) Lift fiber shield over bulb and replace bulb. 

NOTE; Use No. 12GE 6.3V .ISA Minature 2 pin. 



26 



TO REPLACE A BROKEN TAB CM- 100 ONLY) 

(a) Remove music panel and top, 

(b) Remove four screws which secure metal cover on control panel assembly, 

(c) Remove two Phillips screws from front of control panel that hold bank 
of switcht^s associated with tab to be replaced. 

(d) Remove lock washer from either end of switch assembly, and pull rod out 
so it just clears broken tab- It may be necessary to tilt assembly so 
that free end of rod will clear adjacent switch assembly, 

(e) Remove remains of broken tab and insert new piece, 

NOTE; A small bronze spring washer will be found between tab and one 
side of switch assembly. Be sure this is reinserted with new tab. 

TO REMOVE VIBRATO LINE BOX (Mt M-2i M-3t M-IQO) 

(a) Unsolder wires from line box terminals , 

(b) Remove two screws in bottom edge of box fastening it to underside of 
console top- On later units, remove four screws fastening it to rear 

of upper manual. 

TO REMOVE PEDAL KEYBOARD (M, M-2i-M-3i M-lOO) 

(a) Remove dust cover over generator by taking out seven screws from edge 
of generator shelf and loosening four screws in cover just below upper 
manual assembly- 

(b) Unsolder pedal cable from generator. 

(c) Remove three pedal keyboard twisted wires from amplifier terminal panel, 

(d) Place suitable wooden strips under pedal keyboard assembly to support 
it when screws are removed. First remove two screws in back of console 
(Figure 3), and then remove three screws on lower shelf toward front of 
console over pedal keyboard. 

NOTE: It may be necessary to remove two speakers to take out these 

latter mentioned screws. 

(e) Lift console and pull out keyboard and strips- (When re-installing ped- 
al keyboard replace two screws in back of console first, leaving these 
screws loose until remaining screws are replaced), 

TO REMOVE EXPRESSION PEDAL (M, M-2» M-3- M-lOO) 

(a) Disconnect two twisted wires from "SUS SW" terminals on amplifier, (Model 
M, M-2) terminals "W" and "X'' on M-3) . 

(b) Prop up right end of console at least 6 inches from floor. 

(c) Unhook coil spring from expression unit arm. 

(d) Remove screw linking expression unit on amplifier to expression pedal. 

NOTE FOR M-3 ONLY 
A change in all amplfiier coded ''H'' and above removes the positive voltage from 
the stators of the swell assembly- This can be incorporated in earlier amplifiers 
by following the steps below. The end result will place a block-condenser (,02mfd- 
600V) between pin 1 of the 12AX7 and the swell stators- This change will insure con^ 
tinued noise free operation of earlier amplifiers. 

SEE FIGURE 36A OF SERVICE ^L\NUAL 

STEP #1 - Move lower lead of C16 from lug B to lug A, Remove jumper, 
STEP t/2 - Move lower leads of R33, R35, C16 and green lead from lug C 

to lug B- 
RTEP //3 - Move lower lead of R32, Cl5 and blue lead (C15 from ^ ug D to lug C) 
STEP H - Add C9 from lug C to D. 



26A 



LOWER 
MANUAL 



DRAWBARS 



DETACHABLE 
MUSIC RACK 



UPPER on 

SWELL MANUAL 



CONTROL 

TABLETS 




Expression 

(volume) pecal 



FRONT VIEW OF CONSOLE-MODEL M ORGAN 



FIGURE 1 



DIMENSIONS: 
AC INPUT: 

OUTPUT: 
WEIGhfT: 



45-5/8" wide; 25-3/8" DEEP; 42"HIGH 

103 WATTS 

11 WATTS E^I.A. 

249 LBS, 



27 



LOWER 

MANUAL 



DRAWBARS 



PEDAL 



UPPER 
MANUAL 



MIDDLE 



DETACHABLE 
MUSIC RACK 



UPPER OR 
SOLO MANUAL 



CONTROL 
TABLETS 




EXPRESSION 
(VOLUME) PECAL 



FRONT VIEW OF CONSOLE - MODEL N4-2 ORGAN 



FIGURE 2 



DIMENSIONS: 
AC mPUT: 

OUTPUT: 
WEIGHT: 



45-5/8" wide; 25-3/8" DEEP! 42" HIGH 

103 WATTS 

11 WATTS E.I. A. 

249 LBS- 



28 



SYNCHRONOUS MOTOR 



MUSIC RACK BRACE 



PEDAL VOLUME CONTROL 



MANUAL 

STOP 

PLATE 



VIBRATO 
SCANNER 



LINE 
WNEL 



DRAWBARS 



MATCHING 
TRANSFORMER 




STARTING 
MOTOR 



PEDAL 
CABLE 



GENERATOR 
CLAMPING SCREWS 



LINE CORD 



EXPRESSION 
CONTROL UNIT 



TONE 
GENERATOR 



PEDAL I^EYBOARO 
MOUNTING SCREWS 

es) 



'BACK VIEW OF CONSOLE - MODEL M-2 ORGAN 

(with dust cover removed) 
FIGURE 3 



29 



PEDAL DRAWBAR UPPER MAKUAL 

DRAWBARS 



LOWER MANUAL 
DRAWBARS 



CONTROL 
TABLETS 



PERCUSSION 
CONTROL 
TABLETS 



LOWER OR 
GREAT MANUAL 




UPPER OR 
SOLO MANUAL 



PEDAL 

SUSTAINING 

CONTROL 



FIGURE 1 FRONT VIEW OF CONSOLE hA'3 



FIGURE 4 



"START" AND 

RLJN" SWITCHES 
(UNDER MANUAJ-) 



DIMENSIONS^ 
AC INPUT: 
OUTPUT: 
VEIGHT: 



45-5/8" WIDE? 25-3/8"DEEP; 42" HIGH 

103 WATTS 

11 WATTS E.I. A. 

249 LBS. 



30 



VIBRATO LINE 
BOX 



SCANNER 



RUN MOTOh 



POWER 

Terminal 

PANEL 



AMPLlFfER 



PHOr^OGRAPM 
INPUT 



PEDAL GUT OFF 
CONTROL 



SWELL CONTROL 



PERCUSSION CUT OFF 
CONTROL 



BACK VIEW OF CONSOLE M-^ 
(WITH DUST COVER REMOVED) 



MATCHfNG 
TRANSFORWEft 




KEt BUS 3 AH 
SHIFTERS 



STARTING 
MOTOR 



GENERATOR 



PEDAL SWfTCh 
ENCLOSED) 



FIGURE 5 



31 



PEDAL DRAWBAR 



LOWER MANUAL 
DRAWBARS 



CONTROL 
TABLETS 



START & RUN 
SWITCHES 




PILOT LIGHT 



PEDAL 

KEYBOARD 



EXPRESSION 
(VOLUME) PEDAL 



UPPER OR 
SOLO MANUAL 



LOWER OR 
GREAT MANUAL 



TYPICAL M-lOO SERIES INSTRUMENT 



DIMENSIONS: 
AC INPUT: 
OUTPUT: 
WEIGHT: 



44-3/4" WIDE; 25-1/2" DEEP; 44-1/2" HIGH 

155 WATTS 

22 WATTS E. I. A. 

2 68 LBS. 

FIGURE 6 



32 



TAB SWITCH ASSEMBLY 



SCANNER 



RUN MOTOR 



SUSPENSION 
SPRING 



POWER 
TERMINAL 

PANEL 
AMPLIFIER 



PHONO 
INPUT 



PEDAL 

CUTOFF 

CONTROL 



VIBRATO LINE BOX 



PEDAL CONTROL 

MATCHING TRANSFORMER 




START 
MOTOR 



GENERATOR 



REVERBERATION 
UNIT AND 
AMPLIFIER 



SWELL CONTROL 



PERCUSSION 

CUT OFF 

CONTROL 



M-lOO 



BACK VIEW OF CONSOLE 
GENERATOR DUST COVER REMOVED 

FIGURE 7 



33 



UPPER 
WAAJUAL 



0FMWBAA5 



SPGIIAL 
IMPUT' 



LOWER 
P4ANUAL 



ORAWVBAftS 



MATCHING 
TRA^4S- 
FORMER 



1 



MANUAL 
SECTION 

OF 
AMPLlFfER 



VIBRATO 
LINE 



g 

5 

u 

o 



AMOUNT 

OF 
VIBAATO' 
TABLET 



VIBRATO 
SCAhNCR 



VlftRATO 

CHORUS' 
TABLET 






VIBRATO 
TABLET 



PEOALS 



PEDAL SECTCN 
OF 
AMPLIFIER 



PEDAL 

cutoff' 



PEOAL 
ORAWBAR 



INTER- 
MEDIATE 

SECTION OF 

AMPLriEfl 



EXPRES50N 
CONTROL 



I 



RADIO- 



PHONO 



.*>■ 



ourmrr 

SEC TON 

OF 

AMPLIFIER 



SPEAKER 



PEDAL 
ATTACK 
TABLET 



PEDAJ. 

decay' 

TABLET 



PEOAL 
SUSTAIN IMC 
CONTROL 



VOLUME 
TABLET 



FIGURE 8 



BLOCK DIAGRAM - MODEL M ORGAN 



UPPER 
WANUAL 



DRAWBARS 



UPPER 

MATCHING 
TRANS- 
FORMER 



LOWER 
MAP4LIAL 



DPAVvBHftHS 



LOWER 
MATCHING 

TRAhiS- 
FORMER 



VIBRATO 
SOLO 
MANUAL" 
TABLET 



VIBRATO 
LOWER 
manual' 

TABLET 




VtBRATO' 

CHANNEL 




INTER- 
MEDIATE 

section of 

amplif;€R 



viflRATO 

CHANNEL 



VIBRATO 

LINE 



X 



VIBRATO 

cHonus" 

TABLET 



RADIO 
PKONO' 



I 



EKPRE^^iO*^ 
CONTROL 



T 



OUTPUT 
SECTION Of 

AMPLIFIER 



SPEAKER 



AMOUNT OF 

VlSRATO" 

TABLET 



VIBRATO 
SCANNER 



PEDALS 


















PEDAL SECTION 
OF 
AMPLIFIER 








_^^ 




J 


^ 


-^^^ 






-mT- " 












^^^ 






'pedal 

CUTOFF" 

ASiJUSTMENT 




'pedal 

' ATTACK" 
TABLET 


1 


"PEpAi^ 
DECAY - 
TABLET 




PEOAL 

Sustaining 

CONTROL 





PEDAL 
DRA*¥6Aq 



^OluwC 
TABLET 



FIGURE 9 -BLOCK Diagram - MODEL M-2 



34 



O 



3 



U < 

O 






PEPC'J55rOt4 
OM-OF F 
TABLET 






DRAWBARS 




:>Cl ECTOR 
TABLET 




UPPER" 

wA-CwiNG 

THflNS- 

FOavER 



MATCMfMG 

T H AM 5 - 
FORMED 



pf:oal 

CUTOFF' 
ADJU5Tl,»ENT 



I 

1 



PERCU^S'ON 

= ECTIONt OF 
AMPLIFIER 



-—{ DECAV TflOtET 



^OHJME TABLET 



«ADlO 
PMQNO' 



VIBRATO 

50L0 

man.^al' 

TABLET 



MO 
ViBPATO' 
CHANNEL 



VIBHATO 
LOAER 

U A^JUAl' 
TASLET 




MtDJATE 

SECTJON O* 

AMPLif JER 



I 



EXPRE^^IQPJ 
CONTROL 



Output 
section of 

awpuifier 



SPEAKER 



vlSF^ATG 
CHANNEL 



n 



VhSRATO 
LINE 



AMOUNT OF 

VI an AT 0" 

TABLET 



vipflATO 
5CANNEH 



VIBRATO 

CHORDS" 
TA&LET 



PEDAL SECTION 
OF 
AHPHFIER 



I 



PEOA?^ 
AT tack" 

TABLET 



PECAU 
DRAi^flAP 



' P£ DAL 

DECAT ■ 

TABLET 



PEDAL 

SUSTAINING 
CONTROL 



vQlumc 

TABLET 



FIGURE 10 BLOCK DIAGRAM MODEL M-3 



i 



3 






ViM/^n^ 






Tft&t 






LOWfTt 



EVUv*ftA8^ -Afl 



H 



^VStT TAW 



* FLUTES ' 






^CAL^ 



TAU 




Vast Of cavVaa 



JPEttCy5^k»4 ^OTT TA4 






]— 



C^A^^AAS 



4H*ft-*^ 




UPTCfl 


*^ANLi4t. 


_^__ 


^ V^e^UTO 


MA~Cl-tlt4^ 




CANCEl-^ 


THAriS^DP**.^ 




TAB 




y~i 



MAfm^^^s 



L-PWER 

PH*AN^.hAl_ 

MArCk^P^4 



ViVAT-D 
C-A^*CEi_" 
TAA 



AMPLIFIED 



u 



Sf i^TiOM or 



CELTSTEI 
"C-ELELSTLIT 



* ViB^AtO 
TA» 



I 



VlflJ^AlQ ' Nt 







^&AL 



I 



iTfAirf&ArE 
AW^iFJER 



1 



"TFTt-iSiON 



COJl-ftOL 



Of 
AM^hF^ H. 



SPEiUUU 



Ifyt* 



biPAroJ 



1-ftlT- 



¥ -f *HlflArcH 



^^*^ff"tfl 



v^MATG ^A1An-l 

TAB 



l-^ 



HEtf V^IQh 



S^A«A 









' FAST 
TAm 



TAA 



iff T ' 
TJ» 



BLOCK DIAGRAM MODEL M-lOO 

FIGURE 11 



35 



MAGNET 



ONE Slot Of COIL CBOUNOED 




COIL OUTPUT TERMINAL 



TOME WHEEL 



COIL 



FIGURE 12 -TYPICAL TONE GENERATOR 




@ @ @ @ 




18 



\ 
\ 









\ 
\ 



e \@ \0 \@ 



\ 



\ 



(24) 



\ 



\ 



' 




so; 




\ 




^ (5^\ ^^ 



® ® ® 



SYh*CHftOkOOS 
MOTOR CMD 




57 







(60) \ ^ \ (SB) ^ 



®^@ ® ® 



'Q \ 



\ 





\ 



(7^ 

\ 
\ 



e 

13) « 




(56 




D ® © 



e 




BACK or GENERATOR 
(AT BACK OF COMSOCE) 



STARTING 
MOTOR EM) 



*NOT PRESENT ON Mi M-2t M-3 



STARTING 

MOTOR END 



@ 







FRONT OF GENERATOR 



SYNCHRONOUS 
MOTOR END 



@ Q @ 




e 



36} 

\ 





©\ @\ @\ 



(65) 
\ 







\ @\ @\ ®\ ©\ 

S^ (31 






40 













A^ 



^ 



DOTTED LINES SHOW FREQUENCIES WHOSE TOME WHEELS ARE ON SAME ShiAfT 



FIGURE 13 - MAGNET LOCATIONS - ON TONE GENERATOR 



36 






riLTni TnjLMVDfitocni 



ri''Ci> C04KP4CM 



iTUITiHC 




95 We 6 ■■^ 







7|\47\64Vs8';69\*5\02\fl6' S7\9l\72\4e\«5\a9\^^ 



42"^«« 



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NUMBERS ON FILTER TRANSFORMERS ARE FREQUENCY NUMBERS OF TRANSFORMERS 
NUMBERS BELOW TRANSFORMERS ARE OUTPUT TERMINAL FREQUENCY NUMBERS 



FIGURE 14- GENERATOR COVER - MOOEL M ORGAN 



MOTOA (t« 



FILTER TnAl4V0RMCII» 



fl42-| Ul 



STARTTHC 
UDTOfl END 







j T^e 



^£3'*^ n ^ !gB^4 



NUMBERS ON FILTER TRANSFORMERS ARE FREQUENCY NUMBERS OF TRANSFORMERS 
NUMBERS ABOVE AND BELOW TRANSFORMERS ARE OUTPUT TERMINAL FREQUENCY NUMBERS 



FIGURE GA- GENERATOR COVER- MODEL M ORGAN 



HR'AL f*\jVlALn raOftS *PVC -JP 



FIGURE 14A 



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LOWER MANUAL - 



r 



UPPER MANUAL 




DRAWBAR ASSEMBLY 
FIGURE 19 



PEDAL 

CONTACT 
SPRINGS 



PEDAL 
CABLE 



NOTE OF 

SCALE 




KEYING 

CONTACT 

FOR ALL 
PEDALS 



PEDAL 

TENSION 
SPRINGS 



GENERATOR 
FREQUENCY 

NUMBER 



PEDAL KEYBOARD - MODEL M. M-2t AND M-3 

FIGURE 20 



42 



PEDAL 

CONTACT 

SPRINGS 



PEDAL 
CABLE 



NOTE OF 
SCALE 




8 



8 9 10 n 12 



KEYING CONTACT 
FOR ALL 
PEDALS 



PEDAL 

TENStON 

SPRINGS 



13 



GENERATOR 
FREQUENCY 
NUMBER 



FIGURE 21 , PEDAL KEY BOARD MODEL M-lOO 



IWUT FAOM 
ej5 TUBE 



veAATO 

CMOflUS' 

TABLET 



VIBRATO 
TABLET 



AMOUNT OF VIBRATO TABLET 




H 




OUTPUT 



TO aJT 
TUBE 



SECTIONS or VtBRATO LIME 



FIGURE 22 'FUNDAMENTAL OiAGRAW OF VIBRATO 

SYSTEM IN MODEL M ORGAN 



43 



OUTPUT OF 



h^^Rh#^AL 



viaPATO 

SYSTEM 




A TO lin£ boh. 



^ 



20 L2I Tl22Xi5 ^^* 



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VIBRATO PHASE SHIFT L^NE - 



RI4 

"vibrato 
chorus" 



RI5 



I2>^EJS 
Vl&RATO 
"OFF- 



X 



VIBRATO- 




FIGURE 23 -VIBRATO SYSTEM 

MODEL M CONSOLES BEH^W StRlftL NtjM&ER li509 



r40RM4L 



INPLJT OF 
VlRRATO 
5V&TEM 




NORMAL VibRATO 
VI&RATO" 'ON" 



FIGURE 24-V^BRATO SYSTEM 

MODtL >A CQKjSOLES SERIAL NUMBER ii509 f^MD AftO^E 



44 



AMOUNT OF VIBRATO TABLET 



INPUT FROM 

MANUAL 
AMPLIFIER 




VIBRATO 

CHOftUS" 

TABLET 



SECTIONS OF VIBRATO LINE 



OUTPUT TO 



INTERMEDIATE 
AMPLIFIER 



FIGURE 25 -FUNDAMENTAL DIAGRAM OF VIBRATO 

SYSTEM IN MODEL M-2 AND M-3 



45 



INPUT FROM 

MANUAL 
AMPLIFIER 



VIBRATO 
CHORUS' 
TAB 



AMOUWT OF VIBRATO TABLET 
I 






SECTIONS OF VIBRATO LINE 



OUTPUT TO 



INTERMEDIATE 
AMPLIFIER 



CELESTE I 
fcELESTE H 

TABS 



MODEL M-lOO FUNDAMENTAL DIAGRAM OF VIBRATO SYSTEM 



FIGURE 26 



m Lio 



L2 LI 



LI3 UA 



LI6 LI7 



U20 Lai 




FIGURE 27 -VIBRATO LINE BOX-MODEL M AND M-2 ORGAN 



46 



L-1 





Mf Gt 



Later models use a somewhat smaller box, with metal framework. T"™'""' ' 

FIGURE 28 VIBRATO LINE BOX MODEL M-3 




FIGURE 29 VIBRATO LINE BOX ^^^^^ ^-100 




SIDE BRUSH 
TENSION SPRING ^ 



ROTOR CONTACT PiN 



ROTOR 'NSULATOR 



END BRUSH MOUNTED 
ON LEAF SPRING 



-2 SIDE BRUSHES 



ROTOR PLATES 



STATIONARY PLATES 




A-BRUSH COVER REMOVED TO SHOW BRUSHES 



B-VlEW WITH SCANNER COVER REMOVED 
(2 SETS OF PLATES REMOVED TO SHOW ROTOR 



FIGURE 30 vjgRATO SCANNER 



47 



INPUT O* 
VlflHATQ 



OUTPUT O* 
ST STEM 




vkaoATo t .ne box 



^5000 fl^a 



VIBRATO Ph>5E SHIFT LINE 



J 



'¥lBft*TO I = 






(rfODE 



L W' 



VIBRATO SYSTEM 

1 CONSOLES Stfli*L NijWBEfl iMOO TO 2S25i) 

FIGURE 31 



hWP JT OF 
VIMATO 
SrSTtM 



OLfTFHjT OF 

VIBRATO 

STSTEM 




*TD LINE BtMt 



NOflMAL 
Vlftft*TO' 



VIBRATO SYSTEM 

UOOEL M-Z CON&OLCa SERIAU fiuhiDta 2S2S4 AND ABOVE 

FIGURE 32 



THIS VIBRATO LINE BOX 
HAS DIFFERENT APPEAR- 
ANCE THAN UNIT IN 
FIGURE 31 



48 



LOWER MANUAL SCREWS 



END BLOCK SCREWS 



CONSOLE 
LEG 




(S 




— i 




LOWER MANUAL TERMINAL STRJR COVER 



UPPER MANUAL MOUNTING BOLTS 




HOLE fOft 
ACCESS TO 
SCREW 



SCREWS HOLDING MANUALS 
(VIEW LOOKING UP UNDER KEYBOARD) 

FIGURE 33 



NOTES 



49 




50 



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52 



NOTE: 

A change in all amplifiers coded "H" and above removes che positive voltage from che stacors 

of rhe swell assembly. This can be incorporated in earlier amplifiers by following the steps be- 
low. The end result will place a blocking condenser (.02 mfd, 600v) between pin 1 of the 12AX7 
and the swell stacors. This change will insure continued noise free operation of earlier amplifiers. 



Step tfl 
Step Ul 
Step *3 
Step UA 



Move lower lead of C17 from lug B to lug A. Remove jumper. 
Move lower leads of R33, R35» C16 and Green lead from lug C co lug B 
Move lower lead of R32, C15 and Blue lead (C15) from lug D co lug C. 
Add C9 from lug C to D, 




r 



=^s^ 



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^ 



^^^^-^ 




^ 

s 





PICTORIAL M-3 AMP (PARTIAL) 

r 

FIGURE 36A 



53 




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5 



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MANUAL AMPLIFIER 



INTERMEDIATE AMPLIFIER 



OUTPU 



AMPLIFIER 



UPPER MA.^^JAL 
DRAW9ARS 



NINE 
BUSBARS IN 
' 0RAW3AR 



LOWER MANUAL 
DRAWBAR 5 



MATCHING 
TRANSFORMER 

Tl 



MATCH 
TRAN' 



--vv.v 






22 MEG 



R4 



1 

I KEY CONTACT 
■ RESISTANCE 

WIRES ALL 

I J6 OHMS 



at 




<h 




r" 



5^-- 



LU 




EACH DRAWBAR 
HAS 2 BRUSHES 

CONNECTED BY 
ONE OHW RESJSTOR 




W J— ^^d7nQO 



6. a MEG C6 .000015 



}*- 



-± 




< 



^< 



SET OF NINE CONTACTS Ur^DER 
TYPICAL PLAYING KEY ON 
UPPER MANUAL 

i>^A*jv-o — V 

c-AVAr<i — V 




LOWER MANUAL 
BUSBARS 








TAPPED 1/2 OHM RESISTOR 
PROVIDES ^NTEN3tTY 
STEPS FOR DRAWBARS 




.005 



^l 



S Rd 

,4-VW.— H 
P5\2.£MEG 



SPEC 
INPUT' 






lOV. 




^SCANNER^ 



? 



C35 



EXPRESSION 
CONTROL 

_Y LOUD 



C44 



300V. 



.000015 



4__^^ 



5CAN 
PEO" 



d: 



u 



NEGATIVE FEEDBACJ^ 
CIRCUIT PROVIDES VOLUME 
COMPENSATION FOR 
'VIBRATO OFF" 



yiBRATO LiNE BOX^ 
TERMINALS 



AMOUNT OF V 
NORMAL J--/--/--/-" 






R27 R29 

I SMEG;LdMEO 
CIS C40 



SMALL 



.25 



,0002 .0002 



V4 
feSC7 



?j:i^ 



R25 

J|_l — VA* 

C36 1-5 MEG 




25V & 


r ^ 






V 





■n 



^ ^ 



*?*oi 






-la 



^^ a 




+ 290 




A RADIO' PHONO 



,05 



300V 



+ 265 



k 



+ ?2 



VIBRATO ■ "^NORMAL t:^o 





OUTPUT 
TRANSFORMER 



00 




X 



CHORUS 



OFF 



VlfiRATO'ttiS 



ON 



3 



L2 L3 






SET OF NfNE CONTACTS UNDER 
TYPICAL PLAYfNG KEY ON 
LOWER MANUAL 



L4 






l6 




T2 



C46 •** 



-000024-000090 




->J^ 



-s 



SPEAKER 
VOICE COIL 
S OHMS 










U'>i|J 



N 



5 ^ 



i-O 










VT^TvlT 



"■ I r-l' J _L J_ 



IT 




J I LEO LHI |L22 IL23 



C34 



00067 



_i3 




VIBRATO -=^ 



TYPICA 



NORMAL 

—3. 



x 



VIBRATO PHASE SHIFT LINE 

(FOR E3CACT CIRCUIT SEE FIGURES !2A AND T2B-1 



GENERATOR OUTPUT 
TERMINALS 




PEDAL AMPLIFIER 



PEDAL IN C49 



2aov. WITH NO PEDAL PRESSED 
120V WITH ANY PEDA^ PRESSED 



PED 



.02 



V7 
€BA6 



4,5 V A.C. 





■ SOFT 

RS7 
— ^^VVX — 



"VOLUME' 



C53 



22 MEG 



.005 ^^ 



-J 



X 



POWER SUPPLY 



1.5V. WITH^ 
ANY PEDAL 
PRESSED 



50 V WITH NO PEPAL PRESSED 

40 V. WITH ANY PEDAL PRESSED 



+2 90 



RUN SWITCH 
■OFF- 



POWER 
TRANSFORMER 

6.3 V. 



C55 






.IB MEG 



BLK 



120 V 



"PEDAL CUTOFF 



R53 



R54 



KEY SW M 



7^'^ 



ATT- KEY 



3.9 MEG 
DECAY SW( 

NORMAkl 



22M£G 
"SUS SW' '^ 



-O-20 




-START" 250 
BUTTON 



STARTING 
MOTOR 



SYNCHRO- 
NOUS 
MOTOR 



110 V 



>! 




1 



.01 ^ 



HEATERS 



5V 




C57 





-115 



in 



R6 



rtot I r^o 




+ 300 +290 *2e5 
9 9 9 



R67 ' R&e ' 



560 iflOO 



« J-« "_L tf 



^J 



GREY 



56000 2200 i2Q00 

'SPEAKER FIELD" 
_, r^TT' 



pj 



FIELD 1000 OHMS 



FAST 

■PEEWL 
DECAY 



ON 



PEDAL 
SUSTAINING 
CONTROL 



PEDAL 
ATTACK 



PEDAL KEYING 



E F F' G 
PEDAL CONTACTS 



CONTACT CLOSES 
AFTER ANY PEDAL 
CONTACT OPENS 



ALL VOLTAGES ARE PLUS FROM OROUNC UNLESS OTHERWISE NOTED- 
ALL DX, VOLTAGES MEASURED WITH 20,000 OMMS-PER-VOLT METER- 
• * • THIS IS A FIXED CAPACITOR [ 0OOO6 MFD.J IN CONSOLES BELOW SERIAL 
NUMBER 6411. 
* » THIS JUMPER AND RESISTOR IN CONSOLES BELOW SERIAL NUMBER 3 41? ONLY, 

• THIS RESISTOR IN CONSOLES SERIAL NUM3ER 9411 AND ABOVE- 



AO-21007-0 



SCHEMATIC DIAGRAM - MODEL M ORGAN 



SCHEMATIC DIAGRAM 
MODEL M 
FIGURE 40 



59 



VIBRATO LINE BOX 



TO CONTROL PANEL TO SCANNER 



rr^ -z % z2:cijc^« %^ X 3 '^~n ^TO amplifier 

IIOO^OCCf.CCOCODOo'-' 



DRAWBARS 




-i A- 




CO ^ 







BK 




Bh 



D D C 



MATCHING 
TRANSFORMER 



PEDAL 
DRAWBAR 



V 











i 




H^ 





G a 




















75 74 



52 51 



29 ze 



rs 



Upr^ER 
MANUAL 



<U 



^ FROM MANUAL 
BUSBARS 



FREOUF^*CY 
NUMBERS - 





V 





6 





11^'_ 



6 6 
75 74 





6 o 6 







6 6 









,11 



cooooc Qcoboo DQor 





HI 



29 



c 6 




i 



l_OWER 
MANUAL 



/- Rt r^ 



TO AMPLIFIER 



CONTROL PANEL 



\ 




eCN WPRES TO 
CONTROL PANEL 




VIBRATO 



JUMPER WIRES 
\ CONNECT SCANNER 
TERMINALS OF 
^\ SAME NUMBERS 

2 P*- ^ BOTTO M 

. / 
/ 

-^3 WIRES TO 
BN BK ^' VIBRATO LINE BOX 

SCANNER 



GENERATOR 



B5 c 669 WJo 7i o 47 640 SBc 69£^ 15o 62g BOc £7c Sf p 72o 4&v 65 



AZ9 



309 



3S9 



339 3&9 



o 43; 3Ji;. 



BOO 41 




L. ^^A 



TO MATCH. TRANS 
TO AMPLIFIER 



■TO VIBRATO LINE •\ 



GY 



.GN 




VIBRATO LINE BOX 
NUMBERS 



6 ' 



fB^ 



BK 





J=dt.. 



t*.Uo 



CT'jiX'^^^ygj:?,' 



^ 



TO GENERATOR 



lA' 




TO CONTROL 
PANEL 



4 BN WIRES TO 
VIBRATO LJNE 






e BK Wtf*ES TO 
VIBRATO LfNt 



C CN WIRES TO 
SCANNER 






•T " -7 



la 



76 54 ^83 59 ^ 76 52 1 ftf 57 . ■*! 30 79 55 ^ 

6^ 23 M^ 28 4T 21 9] 26 2, IQ 7^^ 24 12^ 20 sT 



77 _53 




89o 70c 46 

S4c i39 




TO CONTROL PANEL 
R42 



o87 06B d44 cCl 



/f^ 



^tr? 



I I 



BK 



J-^ 



^ 




o 



c49^ 



FREQUENCY NUMBERS 



25 t^ 11 



jv-'Vif'vwjrjj^ 



'RUN- 
SWITCH 



'START- 
BUTTON 



FROM 



CONTROL PANEL 



^d—b^^ r- 



1 



I 1 ' 



AN 



" £J 



YEL 



FROM 



CONTROL PANEL 




AC LINE 120V MOV SPKR 
GREY BLK BRWN FIELD 

WH BK 

GY , BK ISN 





BK 




BK iBN BL 



i5 




1 




LINE 
PANEL 



YEL 




GY 


R IBK 




BK 





































DECAY SUS PEDAL 
SW SW IN 



GW ^' BK GY 



AMPLIFIER 





FROM CONTROL PANEL 
[^PEDAL DRAWBARJ 

FROM 



/ SPEAKER N, 



/ MATCH TRANS 



MATCH 
TRAN 



GY 

© ® © 

IGN BK 




y 



COLOR CODE 


BK 


BLACK 


BN 


BROWN 


R 


RED 


OR 


ORANGE 


YEL 


YELLOW 


GN 


GREEN 


BL 


BLUE 


VIO 


VIOLET 


GY 


GREY 


WH 


WHITE 



s 



TO SUSTi^lNINC SWITCH 



ON EXPRESSION PEDAI 



LINE 
CORD 



STARTING 
MOTOR 



SrNC. 
MOTOR 



7 



BN |BKGVlBK^BK^feK^BK^BK^BK_lB. 
rREQ.NdS.l2 



7 



r 







NOTES B 



II 10 9 B 

A* A G= G 



i 4 3 z \ -i- 



PEDAL KEYBOARD 



WIRING DIAGRAM 
MODEL M 
FIGURE 41 



WIRING DIAGRAM- MODEL M ORGAN 



60 



VIBRATO LINE BOX 



TO CONTROL Panel 
^ . ^ 



TO SCANNER 



P-T -^^--»-"»^w_^^ 






[T'Z Z<:22:tx<:c^ ^"V »; ^fafT") ,T0 AMPLIFIER 



DRAWBARS 







V 








rr'^TT'^ — r. 






rni 




~^ 

























7" 74 



13 5' 



29 29 



16 



UPPER 
MANUAL 




OJ 





HK 



MATCHING 
TRANSFORMER 



^Trj 1^ 



PEDAL 
DRAWBAR 



O 



FROM MANUAL 
BUSBARS 



\ 



FREQUENCY 
hJUMBERS — 




'. ■ >/'.' 1^ 



6 ii> 6 6 a 6 





' — 7^"'" 



Tl' 



OS 000 Q 

75 74 






"7 ^ T- 




□ c 




660 




"T y 






U 



□ 60 00 t b f> 





u 




3060 

29 2& 








\A 



LOWER 
MANUAL 



e CN WfPES TO 
CONTROL PANEL 



■o ^ ? % \ CONNECT SCANNER' 

TERMINALS OF 
SAME NUMBERS 




BOTTOM 



BN BK " VIBRATO LINE BOX 
VIBRATO i SCANNER 



GENERATOR 



42? 309 :> 359 **Oo c a 339 3a';* o 43? 31 



90T 71 




^ 



11'^ 



CI 3 6c 4 1 o 



-tr. 



47? 64^ ae- eg? ^45? 02? ae^ e/" 8i^ 72; ^af 'es'^ 

LLXJii! i ii n i till 



TO AMPLIFIER— ^^*4 



CONTROL PANEL 



TO MATCH. TRANS 

-TOAMPLJF"IER 



^ 



GY 




6K 



BN 



\^h 



EEC^CSS^ ^ ^^ctctt:^:':':^^'^':'^^^'^^?^ 



GENERATOR 



R42- 



63 59 . 76 52 







W 50^79 5534 BO,77_53 




70 




-i^TO CONTROL PANEL 





-TO CONTROL 
PANEL 



4BN WfFES TO 
VIBRATO LINE 



fl BK WIRES TO 

VIBRATO LINE 



6GN WIRES TO 

SCANNER 



„^^ 34p 390 0' 

a o ' 3 ^ 

~ 4fl^ fl3 S7 eSi |44 



SI 



BK 



6 



T 



.32 53 ^75 5i .30 50 .73 



13 i. ^*<EQUfcf^CT NUMBERS 



tr.-^ tJjr.T ^J n P iif ^ f ■ T I TrTT--"=cxrj'!^?3&^':^^ ■ V ■RA^XJlTV.A^Tl 



rt '-Ajj.AJT i 



■run' 

SWITCH 



'START- 
BUTTON 



FROM 



CONTROL PANEL 



I 1 



i r--, BN L > 
l^3i 1?__! 



YEL 



FROM 



FROM PEDAL 



CONTROL PAN£;L 




DRAWBAR 



^ 




SPEAKER 



FROM CONTROL PANEL 



III3 



AC LINE 
GREY BLK 

WH BK 



I2CV nov 

BRWN 



5PKR 
FIELD 



BM 








BKjBK ;B N[BL 



YEL 




LINE 
PANEL 



BKi m 





BN BN 



GY 



V 



\^ 



DECAY SUS 
SW SW 



BKl GN 

GN Y BK 



PEDAL 

IN 



VOICE 
COIL 



GY 



PED KEY VI B 



BNI 6K 
fBN 



SCAN 
PED 

BK WBK 

6 




(PEDAL DRAWBAR} 

FROM 
MATCH TRANS. 



WATCH 
TRAN 




GN 



AMPLIFIER 




/ 



COLOR CODE 


», 


SLACK 


BN 


BROWN 


R 


RED 


OR 


ORANGE 


YEL 


YELLOW 


CN 


GBEEN 


w. 


BLUE 


VIO 


VIOLET 


OY 


GREY 


WH 


WH'TE 



TO SUSTAINING SWITCH 

ON EXPRESSION PECAL 



^ 



LiNE 
CORO 



STARTING 
MOTOR 



SYNC. 
MOTOR 



" f (( 

3N BKGYmK 

a id 

FREQ, NO'SJZ 
NOTES B 



T 



T 



f 



T^-^^-r-^^"" 



^WV^^'^ 



3K 



PEDAL KEYBOARD 



REVISED GENERATOR COVER 
SERIAL NO, IS083 AND ABOVE 



WIRING DIAGRAM -MODEL M ORGAN 



WIRING DIAGRAM 



MODEL M 
FIGURE 



- 15033 AND ABOVE 



41?\ 



61 



r 




t 0*TCMlHG 






„ Q?eBRE^59? 



LOWER WAf^UAL 



MANIUAL AMPLIFIER 



GENERATORS 

49-91 OSE 
THtS DRCUlT 




BagaR 




(iENtaATORS 
A4-4B VJSE 
THIS CiPCUJT 



t KtT CWJTaCT 
I «E5i5T*NCt 

I lb OKU2 



I 



•ri 



itj 




ff^ 



ipW 



U^ 





Off 

TZ 'vibrato 

THA^SFOHMfP, MA**UAL 

'vibrato !i:"H^ 

LOWER 
uanual.' 

■ON' 



DR*WB*n 
^ BRUSHES 
ONNECTCD Bv 

Ohm RESI5TOH 



5tT or NihiE CONTACT! UNCER 
TTPJ C*L Plating f^EY OH 

IJPP£H U*NUAL 



16-43 uit 
THIS CIRCUIT 





»/i 




LOWER MANUAL BULBARS 








INTERMEDIATE AMPLfFlER 



RiV 



.000025 



O jO 



SET Of NINE CONTACT! UNDER 
rTf*iC*L Slaving utT ON 

LOWER UAhUAL 




^ 





NEH*TOW OUTrUT^ 
TERMINALS 






PEDAL CABlE 











'4-^. 



I^mLG 



r 







m 



VJB S^-^ 



R2 R2A 



2tlV 



^ i-4= 



* «-. ^ELttTED M 

•'^2*0 FACTORS TO 
^\t eALA»dC(. 

CHAhSELS 



0.2 k4£& 2.7H£<i 

VI c J 

"^ t5J7|z5v I, 

t T (T-^-^ti 

47000 



-OOI V3 







1^ 




■*Z90 



■*Z40 



C20 IS OOOOiO IN SERifci- 
MO ^b49& ANO AbOVt 



EXPRE35*0N 
CONTROLT 



OUTPUT AMPLIFIER 

(5tT AT *ACTO«>') 



CiO 



CIS 



V4 
6SC7 



r^ 



.0DC2 - ^°' 

R2« 

«2»0 I'^uEgJ LAUEG > 



\ SOFT 





,0OOD24-,000C§O 



*5 



€5NT^^^^ 



C2S 



tTh 




ZU) 



U 






1-1*0 



! K -f • 




or s. * lu 



■^ (V > --LI 



viB fC). 
LINE- Y^ 



VIBWA70 L^Ng BO* 
TERMINALS 




'vibrato ^JNOHMAl h^ < p 

CMOnuS' \ VIBRATCT ' > o 



ru 






'AMOUNT OF VIBRATO' 



^ SCANNER ^ 



>. 



A 




g>oy 



o 



B 4 




+Z90 




£60 V 



-^SM, 



\1MS1 




\ 




^\ 




4 






fO«^ EIACT vlMATO CtRCUlT 
SEE rifcURE IS 



VIBRATO PHASE SHIFT LINE 



VOLUME 



NO PEDAL PRESSED OV. 
AMY PEDAL PRESSED ( v 



NO PEEAL PRESSED 260V 
ANY PECAL PRESSED S5V 



N«] PEDAL PRESSED 45V 
AM" PEDAL PHESSeO 55V 




^Z 



PEDAL^^MPLlFiER / "^ 

-M 4s 4^ 




^ 




NORMAL 
"SOFT' 



Ai^L DC VOLTAGES MEASURED iVlTH 
20000-OHMS-PER-VOlT METER 



^ ££ MEIf 



^05 



RUM SWITCH 



POWER 
TRANSFORMER 
T4 



POWER SUPPLY 



f>i o< 



'-^EYSw- Pes 



R74 



ZiO 



120 V 



BLA 




RB? 



-START- ?5o 

WJTTOH (looo FOR 

a4Dv) 



STARTING 
MOTOR 



110 V 



STNCHBO- 
tslOUS 
MOTOR 



fc.1V 
HEATERS 



tZVO -t-ZftO 



^ « 



ATT- KEY 



. 4700 





39 MEG 

^DCCAT Sw'gj'suS Sw" 



^ORual' 



FAST 




-Zi 



GREY 



HEATER RESISTOR 



■'^AVv 



(iBDDOFORiAO V) 



EMRRtSSrON COhYWOl 




- 3ii 



E^8 



"^S 3,. I 5 



W 



Ra«« 



RM 



'OFF 



ON 



PEDAL 
ATTACK' 



od"e ff*gg*a*^b 
pedal contacts 



PEDAL HErlN& 

CONTACT C^.OiES 
AFTER ANY PEDAL 
CONTACT OPENS 



"PEDAL PEDAL 

DELAY" Sustaining 
CONTROL 



T4 



T3 




0©00@0@0 



^»ooo 



-z\ 




SPEAKER f lELO 

— ^fcrr^ — 



TOP VltW OF AMPLIFIER 



70O OHMSB 

* \H EARLY M-; CONSOLES (seRlAL ntfS. &ELOW iljso) 
RBS IS S4000. Ra7 (1 jOpOO. Af*D SPEAKER FIELD IS 
lOo! OHMS. 



SCHEMATIC DIAGRAM 

MODEL M-2 ~ 19000 AND ABOVE 

FIGURE 42 



SCHEMATIC DAGRAM- MODEL M-2 

SERIAL NUUBEn lUOO AND ABOVI 

COUPLES VIBRATO line; SCRIAL WU»UR nz»4 ANDAbOvE 



62 



VIBRATO LINE BOX 

TO COMTROl PAi^EL TO SCAHWE-R 



TO GENERATOR 



6 G^J WIHE5 TO 
COhTPOL PANFL 




STARTING 
MOTOR 



SYNC. 
MOTOR 



SERIAL NO .9000 AND ABOVE 



WiRtNG DIAGRAM OF HAMMOND ORGAN CONSOLE MODEL M-2 



WIRING DIAGRAM 

MODEL H-2 - I90OO AND ABOVE 

FIGURE 43 



63 



VIBRATO LINE BOX 



TO CONTROL PANEL TO SCANNER 



DRAWBARS 



GV 






GY 



MATCHING TRANSFORMERS 

T2(lDWER M^NiJAt.) Tl(SOLO manual) 



TO QEHIHAJOR 



6 GN WIRES TO 

CONTROL PANEL 




STARTING 
MOTOR 



5YNC. 
MOTOR 



WIRING DIAGRAM 

MODEL M-2 - 25254 AND ABOVE 

FIGURE 43A 



WiRlMG DIAGRAM OF HAMMOND ORGAN CONSOLE MODEL M-2 

I 



COUPLED VIBRATO LINE SERIAI. 25254 AND ABOVE 



64 



/ 



i/i 
< 

o 

< 

IT 

UJ 

o 



z 
o 



H 





30LO 



T 

iMATCHING 



ORAw6AaS 






Fl R R R H MATCHi^JG 

LJLJLJLJL^ TOAMSfORiv 



GENERATORS 
4^'^L 1J5E 
THjS C<RCU(T 



GENERATORS 




Q 




- VlB*UTO -^ 
SOLD 



VIBRATO 
LOW£P 

majjllal" 



^ 



R 30 

-WW 



,0000.^0 
■C6 



ft2< n22 
10 MEG 5 3WF:G 

KTOOc! 



MANUAL 
AMPLIFIER 



INTERMEDIATE AMPLIFIER 

CI3 iroooos 



OUTPUT AMPLIFIER 



■ 

i/ 



«^a 




r^t^ CQUJACT 

RESISTANCE 

WIRES ALL 
IS QMMS 



<Xi 



s 



GENERATORS 

;6-43 USE 
TH15 CIRCUIT 



VIBRATO 
CHAf^MEL 
INRJT 



/ 




0000^7, 




*l-5 6 . 

^7ME& 



£50 

SELECTED AT 

TACTORV TO 

BALANCE 

CHANNELS 




cz 



EXPRESSION 
COMT^OL 

/LOLjD 



^ 



5ET At TACTCRV 



C25A 



CIS 



CI6 



VIBPaTO CHANNEL 
INJPUT 



te 



H6 

^?M£G 

R7 "fl 

—r/zu-r— V-^A 

lOWEG 2 7MeG 
R5 

t-VjVw 



00O03O 



VI 
6AU6 



0047 



C^. /Od 



V3A 

I2AU7 




m] 



5ET OP MWE CGMTACT3 
"urJOEH T^'OiCAL T^LAYIPSG 



'1,6 b- 



KEY 



PERCU55 



AMPLIFIER 



RIO 

,j 1 1 MEG 
- ui 



;*-l7 




.^C2B 
047 



rJ 




zgo 




R3Z 
1 ^MEf^ 



■^ SOFT 



OOQ2 5 .0OO2 2 ^^-l- 



c^O |jOQQO^Q 



ogog:?^ - ooaogo 




r4o; 



C^i 



OJ 



o 



s-;g 



BAQIO 

PHO« O 



l^ 



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.^^-^ 



^^90 




V 3B 
2AU7 ^-24 






305 V 



-+250 



fti^ort v4a; 



^ ^^s 



ul 




.001 
R4^A 



.2' MEG 



PEDAL SIGNAL 



n3fl<5 .56 v^:. 

CSI aND qj£ ARE OWlTTCD 

VA TEflvllSiAL6(5 ABOUT 'OC vol I ^ 

i^lgA 15 47MELJ *ND <3 CONNECTED PE"wCErj V4- 

IfciiMirJAufi AMD Ci-OUND ify CODE A£ fl ONlt, 

R5^A i5 OMlTlt^ 1*4 C:^E.i: OMLV 

'139f3?r^iJ CHMe.)j5 CONNECTED &ETa£?.^ V4TEP,WiNAl 

3 iWC CC-JUNDj AiuD USED INMEADC" > 5v QlAS^ i« CODE 

C Oncf. 




N-l *■. U 



3CSV 



■=- 3 




SPEA-^EA VOICE 
COIL e Ohms 



c27 used only \n 

Amplifiers code 
f and above. 



^JOTE A^P'.LFiERS w;th no maraeo code 

LETTE=J a:^E COCE A. 



"T 




Tt 



PERCUSSION 
. HAPMOMLC 
PEPCU'SSION SELECTOR' 

^OFF' Third- 

I 1 

"On' -SECC^JD^ 



T 



W \- 



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■o 

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Rid 



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20OVT6 



RSe*!** 

[^7000 




• 205-^ ' 




C34 
"f^.ODl 



PERCUSS lON 
5^■i^.AL. 



I I 

?oov5 "^ 




rfl 




A"' 



OP VJBRATQ 



vg 
J2AU7 

SELECTED AT FACTORY TO 
&AL*NCE CHANNELS 



on 

'per C 'J SSI ON 

COT OFF" 



ViSRATO LINE 
SOJf TEt^tMIKALS 






K'^ ® 



Sr-1ALL 



PERCUSSION 
VOLLJMe- 



r:53 

— \wv- 

4700 




nee 

-r-'VWv 

^.7M£G 

<JR5'* 

1. 3 MEG 




25 V 



■'i'EPCUSSlON decay" 




Q-O 

^— 'AVv — 

^^UOOO 



-=- f^oaMAL 




LZ 



fy 





VOLUME 



SI 



lJ 






o 




-VIBRATO PHA5E 5HIFT LINE ^ 



^ 




ENEHATQP OUTPUT 
TERMINALS 



PEDAL AMPLJ F^ER 

vio 

6BAfi 




NO PED^L PRESSED OV 
ANY PEDAL PRESSED JV 



M 





= EDAL CaSlE 







J^ -z 




C59^^o^ 



PEO*L 

OF^Av^eAa 



POWER SUPPLY 



lEATER 
PESiSTOfl 



4SO0 (JQOOO FOR Z34VJ 



1 



POWE^ 
TRAP4SfORMEH 
T7 



;- Ji: 



^ '^gc' 



j-\ 



NO PEDAL ^HISSED 290V 
ANY PEOAL PHE55EO lOOV 



RUN 
S W I TC H 
—0 



■3J0 



R30 



377 



PEO-L 
CUTOFF 



' 5 TART ■ 
iWlTCK 



250 



STARTING 

MOTOR 



SYNCHRO- 
NOUS 
MOTOR 



4700 



IZMEG 




r/> 



PCOAL 
ATTACft 




R62 

'WW— 

S.9Me G 



'ZZ 



-o- 



Z: waeov 



S C6I 
"J .00220^ 



CY 



2 5 MEG 



t ^ 



6 0V 
HEATERS 



^. 



380 V 



^m 




zcoo 



R96 
6O0O 



R97 
150 



C63 ^^%oo 



RIGC 
2200 



V6 W6 X ti 

NORMAL 'off 



FA5r 



T7 






® © 



/^ 



. T5 ,r 
I j.^^ 

EXPf^ESSJON . 

CONTROL r-' 



© © © 



T6 




ALL DC VOLTAGES WEASLRED WITH ZO.CDO 
OHMS-PER-VOLF VIETER^ ANO ALL CONTROL 
TAGLETS TILTING TOWa^C ►^RONT OP C0N5OL 



JUMPER 

IN 
SPEAKER 

Plug 



SPEAKER 

Field 
TiTTT- 



*^^oo 



f -tOOV 700 OMMS 



RlDI 



390OQ 



Rioa 

-60O 



-19 



PI 03 

.V^AV- 
lOOOO 



PEOAL 
DECAT 



PEDAL SUSTAINING 
CONTROL 



TOP vjew of amplifier 



.i^ 



CD DȣF F*GO*AA"a 

PEDAL SIGNAL CONTACT OF LA^T 
REOAL RRE5SED REMAINS OPEN 

U^ED ONLY IN AMPLIF'.ER^ CODE & flS;D AB-T'VG 



PEDAL rtEVfAlG 
CONTACT CLOSES 
AFTER ANY PEDAL 
CONTACT 0PEV5 



SEH 



SCHEMA^C DIAGRAM 

lAL NUM&ER J©aX3 AND AfeOVE 



MODEL M-3 



* « VALU6 IN CCLIE 4 AMPLlFi^K' 



#■*«■ USEi ONLY IN C"L. h A Ahfl-^LlFlt Vti 



SCHEMATIC DIAGRAM 

MODEL M-3 
FIGURE 44 



22A 



65 



■on 



/ 



id 

o 



ijpOfP MANUALS 
DRAWBARS. 



LOWER MANLfAL 






IMATCHING 

iTRANSrc'^MER 



r— I I —y ^-• 



GENETS A TCR5 

49-91 USE 
THIS CIRCUIT 



OBfflS 



"viBWaTO-D' 
SOLO. 

■ 2 MAMUAL 

— 1 wATiHtMG "on 



G£tJEPATQR5 

A4,4B USE 
THIS IlRCUiT ,^ 



■DjIC-^^ 



=0! 





10OO3C' . -^ . . 




ON 

VtEPATO 
LOWER 

wanual" 



P20" 

i7MEG 

RSI R2P. 
JVSV„ 
lOMEG. .\3MEG 

-^-w^-r 4*^%,^_-4— \w. — 

470od iL_ J^^^l47MfG 






iNTElRMEDiATE AMPLlFlE^R 



CI3 J/ OODOH 



CIO 



NON VIBRATO 
CHANNEL 
INPUT 



VlSR'^TC' rlHANJNEL 
I^JPlJT 





t 






.27 MEG _[_ 



'^*230 - 



5£:lECTED at 
FACTORV TO 

BALANCE 
CHANNELS 



,— ^^v^ 



.OG002C 



2?MEG 
AflA/^ — rVW*- 



C3'/00l 



"OMEG t^MEG 
R5 



0047 



ffi 



d> 



KEEV CC^JTACT 
RE5t5TANCE 
WIRES ALL 
I& 0KM5 



GEt^ERATORS 

ie-43 lse 

THIS CiRCLIIT 



VI 

&Aue I J 



V3A 
i£AU7 



SET or M^JE COT^TACTS 
UNDER TYPICAL PLAYING KEY 






R47 
r^W^ — 
4 7 MEG 

T4 R^ 



P^RCUSSiON AMPLIFIER 

C26 

v7 

T5 



PERCUSSiOhi 

PERCUSSION SELECTOR" 

'OFF' 'THIRD" 

! I 

"ON" -SECOND" 












EXPRESSION 

CO^JTROL 

/LOVO 



OUTPUT AMPLIFIER 

CZ3i;*'5ETAT fACTORV 



^ 



25A 



CgPnQOOCg Q 



^-^ 



^t 



'2Ai7 



r4DV 



CZI 



CI5 



CI6 



I 

r 



O0022 ^002 E 



R32 



t+3? 



■A/i^-' VvW 



SMEG 



I 6 MEG 
O 



"^^ 






♦ 



op 

HADIO 
PHON O 







R4G 
I MEG 



0O0D24 - 00D090 
V^5 






^^ +290 



u 



o fr^2 



. o 

(tROM V4A) 




305V 



in 



AMF^HFL^R CCDE G ANC ABOV £ - Ol/T^P JT 
CODE H ANjD A feOVEl - C.3 ACE:'ED 



,V6 ^ 

6V6 PJ 

u 



290 



i>Ol 

-—WA— 



.27 MEG 



T3 




5tOV 



3C5v 



"O 




SPEA 
COIL 



e OHMS 



PtlDAL SjGKIAL 



v9 ' 

2ftU7 ^00vT6 



rt 



^ 








o 



200\H ' 




PEBCUS&ION 
bl&NAL 




H4 




VOLUME 



AMOUNT or VIBRATO 



V9 

I3AU7 J 

SELECTED A"^ FACTCRV TO / 
&ALANCE CHANNELS 



ViG^aTO LIME 
BOX TEfiroli^ALS 



+ 



*32 



4# 



13 




l*Ena;5SioN 

VOLUME- 



R55 

— WVv- 

4700 




R60 
-VAV 



PERCUSS' 
CUT 01 



4.7WtG 
R59 
l.Sf^CG 



■»-<^ 



^ 



JO 

i\i 



-f 



25 V 



R57 M / 



62000 



PERCUSSION DEC*Y 
5LOW 



EAST 





nj 



R5D 



-=■ NORMAL 



i32 



E47 




SMALL 



LJ 



L3 L3 



.VA:-,-VVvVA- 



RN^AL 




^047 




:^^1200C 



^ 



-VIBRATO PHA5£ iHIFT i_lME 



^ 




IERATOP OUTPUT 



C56 



TERMINALS 



NO PE1>^L PREr^ED OV 
ANY PEDAL PRESSED (V 




PEDAL AMPL I nC-R 

VIO 

e9A6 



PEOAL CABLE 






01 



c^EDAL 
DRAW&AR 



POWER SUPPLY 



^'^^.>^. ('^^5E:j} 



D91 RE5:6TOR 




4500 fiSOOO FOR Z54V) 



powe:^ 
_ transformed 
1 T7 



- NO PEDAL PRESSED 290V 
ANV PEDAL PRESSED lOOV 



R65 

300OO 



S ^"^7 

■O — VAV 
4700 



PEDAL 

Cutoff 



Rei 

-VV/v- 






Tc57 



^^^-^l 



■^VvV 



3gMEG 



V6 



^^MEG 



'-2 2 




Bl 



'START' 

5w;tch 



R90 



250 
.000 FOR 



STARTING 
MOTOR 



SYNCHRO 

NOUS 
MOTOR 



% C&l -L 
^^.0022 




GV 



t.OV 
HE ATERS 



c ^ 



380V 




L 



^v 




R93 

50 



iJ+- 310 



t20^ 



■^3Z 



R95 

-A'AV- 
SOOO 



A 



C6 



R56 

— WA- 

60OO 



Q+^90 



^°/. 



3 DO 



C62 

450 






PEDAL 
ATTACK""^' 



y6 



T7 




T3 





TS 



T^:^H 



I f 



!T4 



EXPRESSJON 
CONTROL 



r 




!T6 



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ALL DC VOLTAGES MEASURED WITH ?aOOO 
OHh/S'PER-^OLT METEP AND ALL CONTROL 
TABLETS TiLTfNG TOWARD FRONT OF COWSOlL 



JUMPER'' 

W 

i^PEAh^ER 

P-UG 



-lOOV 



SPEAKER 
FIELD 

niTrm- 



-0= 



RiOO 
"2200 






700 OHMS 



RiOl 



i90OO 



'2 2 



RiOE 
'AVvt 

leoo 



-19 



R105 



^. 



'400 



■V: 



25 



PEDAL 
DECAY 



CCDD'EF F-GCAA'B 

PEDAL SrGT^AL CONTACT OF LA^T 
PEOAL PRESSED REMAINS OPtN 



PCDAL I\EVIH& CONTACT 
CLO&Eb 1/VMEN AWV PEDA.L 
IE ri^L^^ED (AFT F.R. 
PECAL SicUAL OCMTACT 
OPEN^)AfcJO CPCN^ WHEN 
PEDAL 15 RfcLeA^ED 



PEDAL SUSTAI.-^ING 
CONTROL 



TCP VIEW OF AM^LJFiER 



SCHEMATIC DIAGRAM MODEL M-3 



SCHEMATIC DIAGRAM 

MODEL M-3 - 904-85 Aid ABOVE 

FIGURE 44A 

66 



"OFP; 



r' 



\ 




T\ 
IMATCHING 

I TRANSFORMER 



UPPea MANUAL5 
DRAWBARS 




LOWER MA>JLrAL 
DRAWBARS 



d 



G£^CRAT0R5 

THIS CIRCUIT 




e 




"VIBRATO TjKj 
SOLO 
>S MANUAL' 

MATCHlWG "Of 

RA^iS^GRMER 



-^ 




iA 



UPPER 

MANUAL 

BULBARS 



Lrt 



GENERATORS 
44^46 U5E 

TTHIS CIRCUIT ^ 












i^EY CO^JTACT 
RESISTANCE 
WIRES ALL 
15 OHMS 




C 



s 



s 



GENERATORS 

ie-43 USE 
THIS CifVCuiT 



LOWfR 

MAMTJAL 

BUSBARS 





R20 
^7MEG 



3 



^ 









o-'AW 





ON 

VIBRATO 
LOWER 
MAHVML ' 



AMPLiriER 



intermediate: amplifier 



Output amplifier 



NQN VIBRATO 
CHAt4NEL 
INPUT 




-V/vV^/A^v--- 
lOMEG VUviE':* 

4TO' 

<o 



■OQl 





P2B 



CIO 



47viFf^ 



,.0000 27 



*l 5 _ 

(FROM VAj 



SELECTED 



R23 
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FACTORY Ti: 
BALANCE 

Channels 



VI6RATO C*^ANNEL 
iNPyT 



i^ 



2 2V1E5 ' 

R7 Rfl 

lOMEG 2 7 MEG 

RS 

I47G0' 



c?o 



VI 

fiALie 



C4 
00-17 



si* 



SET OF NINE COh^TACTS 
UNDER TYPICAL ^LAYI hiG KEY 



(FROM 



PERCUSSION AMPLIFIER 



R47 



47 MEG 
R46 



K 



c2a 



PERCUSSION 
"OFF 

t 

'ON' 



PERCUSSION 

HARMONIC 

SELECTOR" 

"THJRD' 

t 

"SECONO" 





*265 




A^v^ — 

,2 7 MEG 



V4A 

I2AX7^, 

l-WV^J 




fl) 



c^5 



EXPRESSION 
CONTROL 

/LOUO 



C5 



^^ 



lETAT FACTORY 



C?0] /OOOOZO 



V4& 
J2A)«7 



Cl6 A 



0002? D0Q2Z 



R32 



ISMECX I I.BMEG 



R33 

-WW - 



^'2- 



Ti^ 



q:< 



>fo 



SOFT 



oTgr 

RAOIO 
p f^Or4 o " 



W3s^ 



CZ( 




o\ 



R40 
MEG 






U> 



ui 



2<^ 



000024 -OOO 



090 



CZ7. 






o 

[ti?G*l J44^ 



"^ c: 





f 



□ 47 



30SV 



'255 



1 



V6 M 
6V6 " 



"0-19 



^ 






T3 



AMPLIFIER CODE <i AND ABOUE - OO'^^UT 

T^P OMfTTED. 

CDO^ M irJD A60''E - CI ADDED 

CODE J AWD AiiOi-e - P4 SPf,/><ER. 




*3zo 



'ev6 



3CSV 



■J 



krt 



Of 





SPEA^-Efl vOfCE 
COIL S OHMS 



O 



15 



2AU7 



U 



H 



p^ 




c 





Pl^DAL SlGWAL 






O— ^ 



C34 



,001 




PEi^CUSSlON 



I 



M4 



7 9 



SCANNER 




AMOUNT OJ^ VIBRATO 




VOLUME 



V 



4 



v9 
lEAtn 

SELfTCTED *T FACTORY TO 
BALAf4CE CHANNELS 



\ 



ViSP^ATO LINE 
aOJf TERMINALS 



t 



PERCU5SIOM 
VOLUME' 



R33 
4700 




R60 
■'VW^ 



25^ 



4 7MEG 

R59 
l_V/, 

I5WCG 



-31 

-H 

'pERCuSSiGnT 
CUT OFF" j o 

1^ 








P57 

— w\^ 

32000 



M '\ 






iSSlON OECAY 






-^Wv 



o 



-=^ NOClMAL 



>32 






SMALL 




l2 l3 



8 



8 





"^n 



Inorwil 



R46 



2 a MEG 



.-^ 



lS 





CN 



L(0 



LI* LI2 



iriJ 



L 

LI4 jus 




J ^ ^ Si* ^J 

^ g_ g_ i ^_ 



8 



u 




s 



^^12000 



VIBRATO PH A5E IM\V~ LINE 



^ 




C^ 



PEDAL AMPLI tier 

eBA6 



o 





CS^.,01 



P^DAL 
DRA*VBAR 



POWER SUPPLY 



R91 RESISTOR f'*" '-^^E^) PQWEO 

__»,V.'., -— ( TRANSFORMER 

J50O CieOOQ FOR Zi4V) ] T7 




*320 



NiO ^ECAL ^^RESSEb 2qOv 
ANY PEDAL PRESS-ID lOOV 



■-235 



S 77 

■O — ^/vW- 
4700 



. I 9 MEG 
RQ5 g^ 
30000?^ PEDAL 

1 ^CUTOFF 



0L 



:D^-=^ 



-START' 
SWITCH 



350 

1000 FOR 
234V 



STARTING 
MOTOR 



S^NCmRQ- 

NCU5 

MOTOR 



J_L2MEG 




— ^A^^V- 

3.9MEG ^2MEG 



^$? 



V-r^^-2 2 



GV 



■ -J 



C6iJ- ^' 



-^.0022- 



'^ 



v6 



PEDAL 
ATTACK^ 



NORMAL 

I 
I 

FAS T 



5 0V 
HEATERS 



R92 




^U4 ff /" 



320V 



1 
3201V. 




'J}Q 



— -^ 



*32 



Ct2 



C63 



CbZA 
'450 



R96 
60OO 



Ft 97 

ISO 



=9^ 



00 



X i 



PEDAL 
OECAY 



"OfF 



ON' 




T3 




,V5 (V6V (V5 




EXPRESSION 
CONTROL 



^s; 



ALL DC vClTACES MEASURED WITH 20.000 
0HM5-PtR-yOL7 Mt'EP, ANO ALL CONTROL 
TABLETS TJLTING TOAyiRD FRONT OF CONSOLl 



eioi 

IfiO 




ntoo 

2300 



9-^*5 



T: 



'"Sioo 



4go 



10 OOO 



-leo 



Bi02 

-wv. 



stooo 

C64 



25 



PEDAL Signal CONTACT OF LAST 
PEOAL PRESSED REMAINS OPEN 



PLOAL hEYlNi-- L'^'lTACT 
LLCf.ci. ^mEN any pedal 
IS Vr^..-^^. U 1 AT 1 tC 
PF -■ _ S" -*JAl_ I.C^TACT 

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PEDAL SUSTAIN I rJG 

CONTROL 



F-'-^ 'iPtA'' F 



TO^ VIEW OF AMPLlFtER 

SCHEMATIC DIAGRAM MODEL M-o 

T 

- 'yt'\'\^\. ri'i. OS -If I AN u A™ "'VI'- 



SCHEMATIC DI 
MODEL M-3 - 
FIGURE 44B 



AGRAM 
1 09466 



AND ABOVE 



67 



VIBRATO line: box 



TO COWTflOL CAMEL TC SCA^m^R 






DRAWBAR5 

BgaBBBegg b 



g^ggBB^ 



MATCHING TRAM5rORMER5 



FREQUENCY 
NUMBERS ~ 




t GN WIHE^ TO 
COWTROL PA»Jt^ 




t: 



^^ % 5^^ CC^JNECT SCAKMER 
4 \ TERMl'MAL^ or 



OTTOM 






^ 3 w I p 1 5 TO 
VIBRATO LJNE &CX 



VlBRATOE SCANNER 



GENEiRATOR 



85 



?? 



£6 



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90i 7 



t. I c c 



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45 €2| Be 



ezi E 

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67 



91 



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16 



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83 ^,S9 



1 1 i 



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74 ^50 



79 .55 






fi* o^o ^ 



77 ^53 



irl 26 4 2\ 9 26 2 



24 121 2^ 5 




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^ 



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c o c 



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1 



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PERCJSSIC^J SWITCH 

■_ _ _ _f^EAR -yjly^ WJTH COVER ?E_*^OVEp; 






ri :■_■ 



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"^rr^^>V^'^>^^"^"^^V i: 



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BM 



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5 ^ ^ ^* ^ + 

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STARTING 
MOTOR 



SYNC- 

MOTOR 



REFERENCE SYMBOL^ REFTR TQ SCHEMATIC 
Diagram of o^^GAN mOD^L MO 



WIRING DIAGRAM 
MODEL M-3 
FIGURE 45 



WlRIMG DIAGRAM OF HAMMOND ORGAN CONSOLE MODEL M-3 



68 



VIBRATO LINE BOX 



TO COMTPOL PAfJEL TO SCANNER 

A. A. 



^ r. 



2 V 2 V r 3 
C lO OJ n i> ro 



fOCOl^TCO^, PAHtL- 



IS _A__^ z 

rn^0 , fiji a OiZo yf o jfijiFa fffl OS O' pi* 75 



^'cT^ 




TO AMPU^PliR 




0PAWBAR5 



1 — r 





S/ATCHING TRANSFORMERS 

T2(lO*^EO manual.) Ti(solO liamuai.) 



^1 



Pi^^^ 










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7S 7^ 



5? SI 



29 25 



le 



SOLO 
VVAKiLiAL 



•-V 




WH 




PECj-.L 

DPAWBAP 



BUSSARS 



FPECuEMCY 
NUMBERS " 




6 O & i O 6 6 

T5 74 



6oo O^OiOCooobooooOoCHi^ O'liicio oCicioOoiibOo 



52 Si 



1 0666 60600006001 
29 ^S (B 



LOWER 
M^frjLTAL 




;^ 




VI O GV 



VfH 





; -o 



th:l gh 



RED 




rEL 



GN 



f^^. 




Cy BK 








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/ 



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"^ ^0 % 5^X C:;^JNECTSCAMN£0 

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VIBRATO LINE 30X 



P'e.^ a>^ 



VIBRATO^ SCANNER 



GflA*' "= 0>jT<?0\^ PANEL- 



*za 



678 






65<v 5ai 



71 ^ Al'^ 



659 67t 




jM' 



051 6e» 



A90 



dST 674 



CbBO 



679 



6S6 



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66-1 



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osi oaz 



^3^ 



700 4fi 



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6&^ 



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Diagram of organ model M'3 



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WIRING DIAGRAM 

MODEL M-3 - 90485 AND ABOVE 

FIGURE 45A 



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FIGURE SO 

WIRING DIAGRAM 
HAMMOND ORGAM 
M-1 00 SERIES 
WITH A044 
AMPLIFIER ' 



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NOTES 



76 



THE HAMMOND ORGAN 
SERVICE INFORMATION 

M-IOOA 

SERVICE MANUAL 

SUPPLEMENT 





HAMMOND ORGAN COMPANY 



77 



M-IQOA PRESET PERCUSSION UNIT 

When added to the M-lOO series instrument, this unit adds five pre-voice percus- 
sion effects, including reiteration in three speeds. It also provides three percus- 
sion effects, '^Normal (Non-Vibrato)^', 'Vibrato", and "Delayed Vibrato". For the- 
rhythm accompaniment it also provides a "Cymbal -Brush" effect, the "Brush^' 
being on the lower manual, and available when played in a legato fashion each time 
a key is depressed. The "Cymbal"^ is available on the pedal and sounds each time a 
pedal is depressed. The ^'Cymbal-Brush" control turns these effects on and selects 
the "Cymbal-Brush" volume. 



SELECTOR SWITCH 

With the "Selector Switch" in the "Drawbar" position, the signals from the upper 
manual harmonic busbars are routed to their proper drawbar in the upper manual 
group. The following is a breakdown of the harmonic switching used in this kit; 



HARMONIC BUSBAR SWITCHING AND REITERATION SPLIT 

UPPER MANUAL 

The Sub-Fundamental, sub-third and eighth harmonics are not switched. The sixth 
harmonic busbar is used for percussion keying. With the "Selector Switch" in the 
"Drawbar" position, all harmonic busbars are routed to their proper drawbar. 



REITERATION SPLIT 



ir A tr 



Chime 



A" CHANNEL 

Znd 

3rd 

4th 
(5th to Freq. Div. ) 
(1-1/4 From Freq, Div.) 



un u 



B" CHANNEL 



DRAWBARS 
Fundamental 



Guitar 



Fundamental 
3rd 
4th 
5th 



2nd 



Marimba 



Fundamental 



2nd 



3rd 
4th 
5 th 



Xylophone 



Fundamental 



3rd 



2nd 
4th 
5 th 



Banjo 



2nd 
3rd 
4th 
5 th 



Fundamental 



78 



MODE SWITCH 

With the ^'Mode Switch" in any of the reiteration positions, the harmonics necessary 
to produce the "Chime'^ ^^Guitar", and ''Banjo" are all fed into the "A" reiteration 
channel only, while the "Marimba" and "Xylophone" effects feed harmonics into both 
the "A" and the "B" channels. This split into the "A" and "B" channels only occurs 
with the use of reiteration. Without reiteration, all effects are routed into the 
regular percussion system. The two reiteration channels are identical. You will 
note that across the secondary windings of the two input transfornners is located a 
fieldeffect transistor. The gates Q200 and Q207 are fed alternating pulses from a 
bistable multivibrator which supplies alternate pulses to each one of these gates. 
That is; one is on, while the other one is off. These gates shunt the signal to 
ground, thereby making the channel inoperative. These individual signals are fur- 
ther anriplified by a one stage transistor amplifier, Q201 for the "A" channel, and 
Q208 for the "B" channel. They are then mixed together and fed to a common ampli- 
fier which in turn feeds the percussion output terminal, terminal P on the AO-67 
amplifier. The multivibrator which supplies the keying pulses for these two gates 
does not run continually, but rather is turned off and on each time a key is depres- 
sed on the upper manual. The multivibrator consists of Q205 and Q206. Q202^ 
Q203 and Q204 provide the necessary switch pulse to start the nnultivibrator. 

NOTE: Whenever the reiteration is used, it connpletely bypasses the percussion 

section of the AO-67 amplifier. 

With the "Mode Switch^' in the "Normal", ^'Vibrato", or "Delayed Vibrato" po- 
sition, the various pre-voiced percussions are routed into the regular Hannmond 
percussion system, in which case these percussion effects are now available at the 
percussion output terminal, terminal P on the AO-67 amplifier. With the "Mode 
Switch" in the nornnal position all percussion voices sound as nornnal, that is, they 
have no "Vibrato'^ With the "Mode Switch'' in the "Vibrato" position, a portion of 
the signal available at the P terminal is routed through an isolating resistor into 
the "Vibrato" input terminal, terminal '^B'' of the AO-67 annplifier, so that the per- 
cussion voices appear with the "Vibrato", In the "Delayed Vibrato" position, a 
portion of the signal available from the P terminal is routed to the base of Q214, 
It will be noted that the emitter of this stage is not bypassed and the output of this 
stage is relatively low. During keying, after a predetermined tinne lag, Q210 and 
Q2 11 turn off, and Q2 12 and Q2 1 3 go into conduction, thereby placing C211 across 
the emitter resistor of Q214, This materially increases the gain of the stage and 
as the percussion is dying away, feeds this amplified portion of the fading percus- 
sion signal into the "Vibrato" channel of the amplifier giving a "Vibrato" tail-off 
to all the percussion voices. Two positions of the "Mode Switch", "Vibrato" and 
"Delayed Vibrato" also effect the normal Hammond percussions when they are in 
use, 

FREQUENCY DIVIDER 

When using the "Chinne" effect, it is necessary to create a 1-1/4 harmonic for the 
proper reproduction of the "Chime" tone. This is accomplished by routing the 5th 
harmonic into an amplifier made up of Q227 and Q228. Q229 and Q230 rectify and 
further annplify this pulse which is then fed to a two-stage frequency divider, made 
up of Q231, Q232, Q233 and Q234. The output of this second frequency divider is 
then routed back to the "Selector Switch", and is used as one of the harn:ionics in 
the "Chime" effect. 

NOTE: Because a frequency divider can only handle one frequency at a tinne, any 

attempt to play two or more "Chinae" notes at a time will result in dis- 
tortion. 



79 



CYMBAL AND BRUSH 



The "Cymbal-Brush'' switch when in the "off position disables the keying functions 
necessary to produce the "Cymbal and Brush" effect. With the "Cynnbal-Brush" 
switch in any one of the "on" positions, the 8th harnnonic of the lower nnanual is 
disabled and this harnnonic busbar is used for keying the "Brush" effect. The pedal 
keying contact is likewise switched into its proper keying circuitry so that it will 
activate the "Cynnbal" effect each time a pedal is depressed, 

BRUSH KEYING 

With the "Cymbal-Brush" switch in any of the "on" positions, the base of Q217 is 
routed now to the 8th harmonic busbar in the lower manual. Anytime a key is de- 
pressed, the base'voltage of this transistor is routed to ground, and this stage stops 
conducting. The attendant rise in collector voltage is innpressed on one plate of 
C217 and on R262. The other plate of C217 responds by driving excess electrons off 
to ground through diode D204, the resultant positive voltage is then fed to the base 
of Q222, the "Brush" gate. To the base of this "Brush" gate is also fed the noise from 
the noise generator Q218, This noise is nov/ tuned in the collector circuit and fed 
through R279 into the "Cymbal and Brush" amplifier section. 



CYMBAL KEYING 

With the "Cymbal-Brush" switch in the "off" position, the pedal keying contact in the 
pedal switch is routed to the pedal control terminal, terminal "S" on the AO-67 
am^plifier. With the "Cymbal-Brush" switch in any of the "on" positions this keying 
contact is transferred to the base of Q216. Q215 is connected between the pedal 
keying terminal, terminal "S" and ground. With no pedal pressed and Q216 con- 
ducting, reverse bias is supplied from the emitter of Q2 1 6 to the base of Q2 15. Each " 
time a pedal is depressed the base of Q216 is routed to ground. With Q216 not con- 
ducting the reverse bias on Q215 disappears and forward bias is supplied through 
R255, Q215 now conducts and routes the pedal keying terminal to ground. With 
Q216 in a state of non conduction its rising collector voltage is impressed on one 
plate of C219 and on R216. This rapidly rising pulse is fed to the base of Q219 and 
Q220. Here the pulses are sufficiently amplified and fed through the diode D203 and 
on to the base, of Q221, the "Cymbal" gate. To the base of this "Cymbal" gate is also 
fed the noise fronn the noise generator, Q218, The collector circuit of Q221 is 
tuned for the best "Cymbal" effect, and the output of this gate is coupled through R281 
into the "Cymbal and Brush" amplifier "sec tion. 



CYMBAL^BRUSH AMPLIFIER &£ NOISE GATE 

The "Cymbal-Brush" annplifier section consists of Q224 and Q225. The output is 
taken from the emitter of Q225 and fed to the volume switch. The output of the 
volunne switch is then fed back to the noise gate. This noise gate, Q226, effectively 
shorts the signal line to ground when neither of the "Brush" or "Cymbal" effects are 

in use. R261 and 262 feed a positive voltage to the base of Q223 anytime that a low- 
er manual key or pedal is depressed when the "Cymbal-Brush" switch is in any of 
the "on" positions. When this occurs, Q223 goes into conduction, thereby depleting 
the base voltage applied to Q226, With Q223 in a state of non conduction ("Cymbal- 
Brush" not keyed), sufficient base bias is supplied through R287 to the base of Q226, 
putting it into a state of conduction and thereby shorting the signal line to ground. 



SO 



CHANGES A^m REVISIONS 



Referring to Figure 56 of the M-IOOA Service Manual Supplement » the following 
components on the schematic have been deleted. These four components will be 
found in the middle and lower portions of the Brush and Cymbal keying circuit- 
try. The following items have been deleted: C-218, R-265, R-275, D-204, and 
C-2A3- The following component values have been changed: R-283 was 47K is 
now lOK; R-285 was 470 ohms is now 100 ohms; R-296 was lOK is now 4-7K; resist 
or R-279 which was selected is now fixed at 4-7K. 

Two Zener diodes, D-209 and D-211 in the power supply, have likewise been 
eliminated. D-209 is now replaced with a 68K half-watt resistor and should 

be designated R-325. These changes alter the voltages available from two of 
the taps on the power supply. The tap which was marked +91 volts should now 
be changed to read +80 volts. The supply previously marked -12 volts should 
now be changed to read -9 volts. On the schematic diagram, Figure 56, add a 
220K resistor from the collector of Q-213 to ground. Designate this component 
R-330. 



NOTES 



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NOTE 
PLUGS MARKED 

"X" ARE MATED 

ON lATZ MODEL 
M-lOO WITHOUT 
END BLOCK ASS'Y 



r_ 



a^JlBLfGT: Ibn [bK r&K TBK fBK T&K JBk ^BK TTl 



I 15 \^Cn JZ II iO 9 B 

jj , C B A* A fi' G 

16 



Bk Bhv IB^ BM ifiK B^ 



r* » 



_of- DAAfat,»r EJUL^ I 



■* 3 2 I 

0' D C* C 



^£DAL KEYbOA^O 



S"REV£R6 SPEAKER 
6 OHMS 






AO-31208 



WIRING DIAGRAM M-IOOA 
FIGURE 57 



SPIRING DIAGRAM M-IOOA 



88 









HM^T]-' 














^R-Z0 3 U 



^R'ZO^V ^ 






\c-Zo 



^^ih V 




^ 








fl-Z89 
— V~ 



W«irE'SHl£LOE£l 






-0 



B 'CH^^NEk. if^Pt/T 



H^i^2H 








HI1> 






/ r^p 










'*•" 



Y 



r-^oo 



^r^ip 











■ ^-zs-ei — >- fcTi?V - 




^OS' 




M53S2U 




















•-OI5-' 










— [ff-ZTzT- « 



MMSIT-» 










1 

^ 

fe 



Mft-3i g I— 



! 



Mff-3o3 [ -^ 








^^'3QaU 



i 






■- t^-306) -* 

<^3/V "- fc^Tsh 



^4.^3 



m 



oj?fl*i 



.^ 



'-2 '7 3) » 



BRUSH £_£t/£L-^ 

t-ZO( 







T 



•-{ P.-30I Y - 









o 






iz?7,.- H^^^i^h 



'PCT^USS)OV To 






P Bu) 




v Y 












^8 






+ 



^ 



55)^7-oSkH/rcK 



H^29S"H 



R-292, 






# 








1, 
o 



HtSIh -^ ^^^^^^ 




ME^a— 



rf^PuT 








^^-^4(k 






- (^^9% T 



-{R^33> 



WHFTf 

SHfCLDtp 







wttrre 



= ® 



Hff-^38 1 -* ^R'^37U 



^ 



FIGURE 58 



PERCUSSION UNITS PARTS DIAGRAM 



89 



INSTALLATION AND MAINTENANCE 

INSTRUCTIONS 



IMPORTJNT-Wh^n the organ is set up for opera- 
tion, the generator should be freely suspended. To do 
this remo\x four hexagun head screws under shelf, turn 
four sleeve and washer assemblies over so that washers 
are down, and replace screws, tightening them securely. 
Use shims under console, if necessary, to set level in 
order that generator is free to move in any direction. 
Failure to do this will cause noisy operation. 

The console back should be at least 1 14" from the wall to 
allow proper ventilation. Be sure that the motion of the 
pedals is not restricted by rugs or unevenness ot the fioor. 
When playing the console, see that no piece ot electrical 
equipment having a strong magnetic field is close to it. 
For example, an electric clock standing on the console 
can in some cases produce a loud hum in the speaker. 
This may occur also if a clock or other piece of electrical 
equipment is in an adjoining room close to the wall 
opposite to the organ. 

Before plugging in the organ, be sure your electric sup- 
ply is alternating current of the 
proper voltage and frequency as 
specified on the name place. It it 
is not, or if the frequency is not 
regulated, consult your dealer* 



DATE Of LED 



PEDAL CUTOFF 
ADJUSTMENT 

If you find that a faint pedal note 
is heard continuously as long as 
the organ is turned on, this con- 
trol probably needs adjusting. It 
is a slotted shaft located on the 
face of the amplifier and is set at 
the factory. To adjust it, set the 
expression pedal wide open, pull 
the pedal drawbar to its loudest 
position, leave all control tablets 
up, and play, then release, the 
liighest pedal key. Allow the pedal 
note to decay for at least 15 

■ 

seconds, and then slowly turn the 
pedal cutoff control clockwise 
until the faint pedal note just dis- 



appears. Do not turn it any farther. This procedure will 
probably be necessary in case the 6BA6 tube is replaced. 

PERCUSSION CUTOFF ADJUSTMENT 

If the percussion tones do not fade away or their decay 
is unusually fast or stow, this control probably needs 
adjusting. It is a slotted shaft located on the face of the 
amplifier and is set at the factory. To adjust it, push in 
all drawbars, and push down only the tablets marked 
'Tercussion Second Harmonic/' ^'Percussion Fast De- 
cay," and 'T'pper Presets-Drawbars," Use a weight to 
hold down several keys on upper manual, and set ex- 
pression pedal to loudest position. After about 5 seconds 
turn percussion cutoff control until the tones are just 
barely audible. Do not turn control any farther since 
this setting will provide the smoothest decay. This pro- 
cedure should be followed in case the 12AU7 tube 
(nearest to end of chassis) is replaced. 

MOVING OR SHIPMENT 

If the organ is moved at all, always be sure that its 
weight is supported by the case and not by the pedals or 
pedal mechanism. Be careful also not to put undue strain 
on the legs. Aside from this, no special precautions are 
required if the organ is to be moved only from one room 
to another. If it is tn be moved some distance^ it is 
important that the generator be fastened duwn to the 
shelf. Remove and reassemble the four sleeve and washer 
assemblies with sleeves down and tighten securely. This 
will prevent serious damage. 

OILING AND MAINTENANCE 

CALTIONiOil at end of first year and only once a year 
thereafter. NOTE; Before oiling refer to oiling instruc- 
tion label located on generator cover or back paneh Use 
the chart at right as a reminder, IMPORT.ANT: Use 
only special oil supplied with organ. When your supply 
is exhausted, you may purchase additional oil from your 
dealer or direct from Hammond Organ Company. 

With the exception of regular oiling^ the organ will 
require little attention. If any servicing is required, call 
your Hammond dealer or write to the factory. Always 
mention the model and serial number, shown on the 
name plate. 



RAPHJCS 



PRINTED IN U.S.A. 

HOOO-006059 9/83 1 300 



HAMMOND ORGAN COMPANY 




OMK^UNtCATlONS 



PARTS ORDERING UJFORMATION 



Uhen ordering replacement parts from the Hammond Organ Company, the 
following guidelines should be observed: 

1) Address all parts orders to: 



2) 



HAMMOND ORGAN COMPANY 
PARTS DEPARTMENT 
4200 W. DIVERSEY 
CHICAGO, IL. 60639 



All orders should specify the model and serial numbers of 
the instrument that is being serviced. (Note: On late 
model instruments the model and serial numbers are printed 
on the tag attached to the underside of the organ keyboard 



} 



3) All orders should specify the Hammond part numbers of the 
desired parts, 

4) All orders should provide a specific description of the 
desired parts. (For example; Power transformer, 15 volt 
zener diode, F through B key module, etc.} 




PARTS LIST EXPLANATION 



This parts list begins by listing all the major assemblies (designated) 
by ^C^) on pages 6^3 thru 6^4- Major assembly breakdowns are then 
listed numerically ( CD » (T) ,@, etc. , < ) on the following pages. The 
format for which major assemblies are broken down is shown below. 



(6) Maj or Assemb ly 



1 
2 

3 



Minor Assemb ly 



tt 



II 



tt 



ft 



b 

c 



Component of Minor Assembly 
ti If If II 



tf 



It 



ft 



M 



1 

11 

111 



Sub-Component 
PI 



* « 



II 



Example : 



( 6 ) Lower Keyboard Assemb ly 



119-000095 



1 

2 
3 



Preset Kev Module 
Preset Key H^dule 
Key Module 



057-054157 
057-054156 
057-054077-005 



37 Visual Memory Cance 1 Assemb ly 
a Spring 
b Grommet 



060-053454-001 
012-028799 
04 3-053308 



m 



Screw 

i Washer 



999-054489 
999-000810 



NOTES : 



1. Assemblies not shown are NO LONGER AVAILABLE - NLA 

2. Items without part numbers are NLA- 



3- Parts listing does not insure availability 



TABLE OF CONTENTS 
MODEL M,M2,M3,M100 



MAJOR ASSEMBLY 



PAGE 



MAJOR ASSEMBLY FRONT VIEW (MODEL M3 & MlOO SHOWN) 6-4 

MAJOR ASSEMBLY REAR VIEW (MODEL M3 & MlOO SHOWN) 6-5 

(T) CONTROL PANEL ASSEMBLY 6-6 

Cl) STOP SWITCH (TONEBAR) ASSEMBLY 6-7 











STOP SWITCH BASE 6-7 

CONTROL SWITCH ASSEMBLY 6-7 

UPPER KEYBOARD ASSEMBLY 6-7 

UPPER RIGHT HAND ENDBLOCK 6-8 

FRONT STRIP 6-8 

LOWER LEFT HAND ENDBLOCK 6-8 

LOWER KEYBOARD ASSEMBLY 6-8 




101 LOWER RIGHT HAND ENDBLOCK 6-8 



lU EXPRESSION PEDAL ASSEMBLY 6-9 

U) PEDAL SWITCH ASSEMBLY 6-9 

13^ MATCHING TRANSFORMER 6-9 



14) GENERATOR ASSEMBLY 6-9 




15) AMPLIFIER ASSEMBLY 6-10 

16) REVERB AMPLIFIER 6-11 

in REVERB UNIT 6-11 



(^ 



SPEAKER. 



6-11 



19) VIBRATO LINE BOX 6-11 

2?1 PEDAL VOLUME CONTROL 6-11 



© 



MISCELLANEOUS PARTS 6-11 




22^ VIBRATO SCANNER SERVICE INFORMATION.. 6-12 




M-3 

Note: Item (ij not used on M, M2^ M3 




Note: Item (T) not used on M-lOO 




M-3 



Note: Item ®,® not used on M, M2, M3 




M-lOO 





PARTS LIST M. M-2, M- 


-3. M-lOO 


(T) COf 

1. 


JTROL PANEL ASSEMBLY (M-lOO ONLY) 




CONTROL PANEL 




2. 


SWITCH ASSEMBLIES 
BASS PEDALS 
PERCUSSION 
VIBRATO 








,..008-024530 




UPPER PRESETS 






REVERB & VOLl'ME 




3. 


INDIVIDUAL SWITCH 








...008-024602 




REVERB I & II 






FAST DECAY 






SECOND & THIRD HARMONIC 


008-024605 






,..008-024606 




FAST DECAY 






VOLUME SOFT 






BASS MUTE 






VIBRATO CHORUS & PEDAL LEGATO 






VIBRATO CELESTE I & II 






DRAWBARS , FLUTES , D lAPASON , ENSEMBLE 








..008-024613 




VIBRATO CANCEL 


008-024619 




CLARINET & FULL ORGAN 


008-024626 


4. 


CONTROL TABS 








. .031-036656 


FAST DECAY (2 USED) 


• * ^^ ^1^ ^ ^-^ ^ \i/ V -^ vy 

031-036488 




BASS MUTE 


031-036657 






. .031-036486 




THIRD HARMONIC 


■ W \^ ^^ ^k \^ %^ \J T ^m^ \J 

031-036487 




PERCUSSION SOFT 


031-036489 




VIBRATO SMArt. 






VIBRATO CHORUS 








. .031-036558 


VIBRATO CELESTE II 


■ m \j m^ ^ \J -^ \r \J -^ \-ii 

031-036659 




DRAWBARS (2 USED) 


031-036481 






. .031-036661 


DIAPASON 


W W ^r m^ ^U \J ^J \—f \-J fi—f ^U 

031-036660 




ENSEMBLE 


031-036482 






..031-036662 




TRUMPET 


031-036483 




CLARINET 


031-036484 


* 




..031-036485 




REVERB I 


031-036493 


T 


REVERB II 


031-036494 






..031-036495 


3. 


START SWITCH 


008-024537 


6, 


RUN SWITCH 


008-024536 


7. 




. .016-022885 


a. LENS 


V V X^r ^^ ^^^ H^ ^BH ^BH 'i^r ^_# ^^r 

016-031454 




b. PUSH ON CLIP 


013-031468 



© 


STOP SWITCH (TONE BAR) ASSEMBLY 














.120-021620-001 








MODEL M-lOO 










1. 


TONEBAR KNOBS BLACK 

IVORY 




025-035570 

025-035571 

.025-035572 








WITH RED DOT 












a. KNOB SCREWS 




821-070514 






2. 


TONEBAR CONTACT WITH SLIDER 




060-036603 






3. 


BUS BARS 










4. 






.043-020574 






5. 


BUS BAR PANELS 




025-020373 






6. 


PEDAL TONEBAR SLIDER ASSEMBLY 

a. COUPLING INSULATOR M,M2,M: 

MlOO 


M,M2,M3 

MlOO 

! 


060-035984 

.045-020727 

045-024517 




© 


STOPSWITCH BASE 








^ -^ 




MODEL M 












MODEL M2,M3 












MODEL MlOO 








© 


CONTROL SWITCH ASSEMBLY 








^^-»*^ 




MODEL M 












MODEL M2 












MODEL M3 








■ 


I. 


ROCKER TABS VIBRATO ON/OFF (M ONLY) 


.025-020655-002 








PEDAL ATTACK 




025-020655-003 








PEDAL DECAY 




025-020655-004 








VIBRATO LOWER MANUAL 


.025-020655-005 








VIBRATO SOLO MANUAL 


025-020655-006 








VIBRATO NORMAL/VIBRATO CHORUS 


025-020655-007 








AMOUNT OF VIBRATO 










2. 


TOGGLE SPRING 








© 


UPPER KEYBOARD ASSEMBLY 








^*^^^ 




MODEL M 












MODEL M2,M3 












MODEL MlOO 










1. 


BUS BAR CONTACTS M,M2,M3 

MlOO 




.030-033445 






2. 


KEY CONTACTS 




012-033530 






3. 


KEY COMB ASSEMBLY M,M2,M3 (1 


USED) 


057-021239 








M,M2,M3 (3 


USED). . . . 


.057-021238 








MlOO (1 


USED) 


057-038083 




H 




MlOO (3 


USED) 


057-037989 






4. 


KEY CHANNEL ASSEMBLIES M,M2,M3 (SHARPS) 


057-035832 








M,M2,M3 ( 


; NATURALS) 


.057-035831 








MlOO (SHARPS & 


NATURALS ) 


060-033392 






5. 


KEY SCREWS (ALL) 




850-000002 




t 




a. WASHERS 










6. 


nP'^TnP FFT T M M2 M3 . . . . 




.042-022369 






MlOO 




■ 'a^ m^ ^mJ ^^ ^^ ^1^ ^^ w' 






7. 


DOWNSTOP FELT M,M2,M3 

MlOO , 




042-001701 
.042-031227 





















8. KEYS M,M2,M3 



KEYS MlOO 



© 



SHARPS 

C 

D 

E 

F 
G 

A 
B 
CX 

SHARPS 

C 

D 

E 

F 

G 

A 

B 

CX 



UPPER RIGHT HAND ENDBLOCK 
MODEL M»M2,M3 
MODEL MlOO 



(18 USED) 025- 

(3 USED) 025- 

(3 USED) 025- 

(3 USED) 025- 

(4 USED) 025- 

(4 USED) 025- 

(4 USED) 025- 

(4 USED) 023- 

(1 USED) 025- 

(18 USED) 025- 

(3 USED) 025- 

(3 USED) 025' 

(3 USED) 025- 

(4 USED) 025' 

(4 USED) - 025' 

(4 USED) 025 

(4 USED) 025 

(1 USED) 025 



■036295 
■035666 
■035667 
■035668 
-035669 
-035670 
■035671 
■035672 
■035673 
■032672 
-042279 
-042280 
-042281 
-042282 
-042283 
-042284 
-0422J5 
-042286 



025-024307 



© 



© 



© 



FRONT STRIP 

MODEL M,M2,M3 
MODEL MlOO 

LOWER LEFT HAND ENDBLOCK 
MODEL M,M2 
MODEL M3 
MODEL MlOO 

1. PERCUSSION SWITCH ASSEMBLY (M3 ONLY) 

a. ROCKER TABS PERC ON/OFF 

PERC VOLUME 

PERC DECAY 

PERC HARMONIC SELECTOR 

b. TOGGLE SPRING 

c. SWITCH PANEL ASSEMBLY 
LOWER KEYBOARD ASSEMBLY 

MODEL M,M2,M3 

MODEL MlOO 



061-020371 

051-024165 



025' 
125 
025' 
025 
025 
025 



■024848 
■000023 
036083 
■036084 
■036082 
■036081 



119-000010 



NOTE: 



PARTS FOR LKB ASSEMBLY ARE 
SIMILAR TO THOSfi^ USED ON THE 
UKB ASSEMBLY (5 



@ LOWER RIGHT HAND ENDBLOCK 

MODEL M,M2,M3 
MODEL MlOO 



025-024847 



8 



@ EXPRESSION PEDAL ASSEMBLY 

MODEL M,M2 
MODEL M3 
MODEL MlOO 

1. PEDAL ASSEMBLY M,M2,M3 

MlOO 

2. RUBBER MAT M,M2,M3 

MlOO 

3. PEDAL SUSTAIN CONTROL M,M2,M3 

4. LINK & BEARING STRAP ASSY M,M2,M3 

5. PEDAL ARM M,M2,M3 

MlOO 




12 




© 



043-046347 

028-020458 
041-020456-003 



PEDAL SWITCH ASSEMBLY 

M,M2,M3 
MlOO 

1. PEDAL CABLE M,M2,M3 

MlOO Oil 

2 . ACTUATOR 045' 

3. PEDAL KEYS BLACK (SHARPS) (5 USED) 025 

BROWN (NATURALS) (7 OR 8 USED) 025' 

4. GUIDE FELTS (2 PER PEDAL) 042' 

5. UPSTOP FELT (26 USED) 042- 

6. DOWNSTOP FELT (13 USED) 042' 

7. ACTUATOR SPRING 012- 



■024545 

■020436 
■031469 
■031666 
■021255 

■020410 
■031898 
■020972 



3 J MATCHING TRANSFORMER 
MODEL M,M2,M3 
MODEL MlOO 



003-021752 
003-024498 



GENERATOR ASSEMBLY 

MODEL M,M2,M3 

MODEL MlOO 
1* RUN MOTOR (ALL) 

2. START MOTOR (ALL) 

3. VIBRATO SCANNER M 

M2 
M3,M100 

4. DRIVE COUPLING ASSEMBLY (RUN MOTOR TO 

GENERATOR) 

5. DRIVE GEARS COUPLING SPRING 

6. MOTOR COUPLING SPRING (FLYWHEEL SPRING) 

7. MAGNET AND COIL ASSEMBLIES 

FREQ #1 
MlOO FREQ 
FREQ 



021-035903 
021-035137 



n 

?/2,4,6,9,ll 



064-035769 
012-031463 
012-002345 

065-036583 
065-033268 



FREQ #3,5,7,8,10, 


12 






FREQ #13 THRU 17 




065-036582 




MlOO FREQ #13 




065-033271 




FREQ #18 








FRFQ #19 THRU 24 




■ 




FREQ #25 THRU 30 




065-033273 




FREQ #31 THRU 36 




065-033275 




FREQ #37 THRU 43 














9 





© 

+ 

* 


AMP 

I. 

2. 
3. 

4. 
5. 
6. 

7. 

8. 
9. 

10. 


M3 FREQ y/42 

FREQ /M4 THRU 48 

FREQ //49 THRU 54 

FREQ #55 THRU 60 

FREQ y/61 THRU 72 
FREQ //73 THRU 91 

LIFIER ASSEMBLY 
MODEL M 
MODEL M2 
MODEL M3 
MODEL Ml 00 


065-033277 

065-033176 

065-033177 

065-033160 
065-033161 

, . .003-028526 


M3,M100 
OUTPUT TRANSFORMER M,M2,M3 


P W ■ ^_X 'm^ ^^ ^aJ ^^ ^^ ^v* ^^ \^ 

003-024157 

003-024954 

,. .003-024111 


PERCUSSION MATCHING TRANSFORMER 

MS.MIOD CT4) 

PERCUSSION INPUT TRANSFORMER 

M3,M100 (T5) 

PERCUSSION OUTPUT TRANSFORMER 

FILTER CAPACITORS 

50MFD/450V 

DUAL 50MFD/45DV 

50/50/50MFD/450V 

20/20/30MFD/400V,30V 

40/20/20/30MFD/400V,25V. . , 

a. MOUNTING INSULATOR 
SWELL CONTROL 

a. TRIMMKR CAPACITOR 


^B V ^^^ m^ ^^v ^r ^BH ^^m ^^r ^^^ 

003-036229 
,..003-036498 
,..003-024112 

450-010070 
450-040400 

...450-040300 
045-021032 

499-021468 
. . .060-020765 


POTENTIOMETER (PERC & PEDAL CUT OFF) 

VACUUM TUBES 5U4 

fiVfi 


676-000124 

002-005201 

. . .002-006703 


6SC7 

6J7 
6J5 


■ V V ^rf \^ ^^ ^-r' ^^ \^ ' ^^ ^^ 

002-006305 
TOO0-000OO0-6J7 

. . .002-006502 


6BA6 
6SN7 


V ^B W ^» ^» ^^^P '^^ ^^ ^^ T^' ^^^ ^^^ 

002-006501 

002-006306 

. . .002-006500 


6C4 
12AU7 


^B ^ V B—r ^_r ^hv ^r ^w^ ^v ^^F ^^^ ^-^F 

002-006300 

002-012300 

. . .002-012301 


LINE CORD (ALL) 


■ ■ ■ tkJ *a^ k^ ^^ -^ ^^ 4#^ ^r ^B 

011-053851 


10 1 








W 



fe} REVERB AMPLIFIER (MlOO ONLY) 

AO-35 (EARLY MODELS) 
AO-44 OR AO-66 (LATER MODELS) 

1. POWER TRANSFORMER AO-35 

AO-44 (DOMESTIC) 003-024956 
AO-44 (EXPORT) 003-036756 

2. OUTPUT TRANSFORMER AO-35 

AO-44, AO-66 003-036552 

3. FILTER CAPACITOR AO-35 450-040200 

AO-44 

4. MINIATURE LAMP GE#12 6.3V/.15A 016-022885 

5. LAMP HOLDER 

6. POTENTIOMETER AO-44 R27 2K 

AO-66 R6 IM 676-000101 

7. TRANSISTOR AO-44, AO-66 001-021260 

8. FUSE AO-44 ONLY DOMESTIC 3/4A 016-039512 

EXPORT 3/8A 

9. VACUUM TUBES 5U4/5Y3 002-005201 

ECC83/12AX7 002-012301 

6BQ5 002-006700 

EZ81/6CA4 002-006200 
ECL86/6GW8 002-006401 

^7) REVERB UNIT MlOO ONLY 121-000046 

s) SPEAKER M,M2,M3 

MlOO (REVERB) 014-046896 

(LOW FREQ) 014-030812 

(HIGH FREQ) 014-024347 




9 J VIBRATO LINE BOX 121-000053 

1. COJL (LATER MODELS) 003-033303 

(EARLY MODELS) 003-021842-003 




OJ PEDAL VOLUME CONTROL 



@ MISCELLANEOUS PARTS 

1. GENERATOR SUSPENSION SPRING 012-033227 

2. EYE SCREW 
a. NUT 

3. GENERATOR HOLD DOWN SCREW 824-000003 
a. SLEEVE WASHER ASSY 060-021751 

4. START SWITCH M,M2,M3 008-016944 

5. RUN SWITCH M,M2,M3 008-024536 

6. KNOB FOR START OR RUN SWITCH 025-002071 
^ 7. MUSIC RACK BRACE M,M2,M3 

' 8. MUSIC RACK THUMB SCREW M,M2,M3 

9. MUSIC RACK HINGE MlOO ONLY 032-033414 

10. REAR COVER MlOO ONLY 




:m 




HAMMOND ORGAN COMPANY 

DIVISION OF HAMMOND CORPORATION 

11700 Copenhagen Court / Franklin Park, Illinois 60131 

(312) 766-6950 



REPAIR 



A N D 



DISASSEMBLY 



O 



r 



VIBRATO 



a 



CAMMER 



O 



(A) Although this technical bulletin is based on scanner repair, it is not the 
single source of vibrato problems. Check existing switches, vibrato pre- 
amp. (tubes, etc), phase shift line box, and cables both to and from the 
scanner. 



(B) 



SYMPTOM 


CAL'SE 


^!iPa:r 




(I) D<ad 


(U) Vibrato Switch 

(b) Vibrtto pre-amp, (Tubes, etc-) 

(c) Open SlgnaL Wire to Une-box 

{d) Open Froa Scanner ihlelded cable. 


(la) Eeplace Svltch 

(b) Replace tubea or other 
defective cosponcnta. 

(c Replace wires or repair 
4 d) connections. 




(2) Choppy Vltrato 

m 


(2a) Shorted capacltora on Ilae-box 

(b) Open collfl on line box 

(c) Oil saturated bakelitc Insularors vhlch 
plclt up Icnpurlclea and short out the 
staclonary plates to the D\alfi aaaeobly 
chaaala of acanncr. 

\A) Rotor plates rubbing agalnaC the stationary 
plAtca Inelde scanner. 


C2a) Replace defective com- 
& b) ponents 

(c) CXoan Stationary snd rotor 
platen and replace insulat- 
ors, icolacin^ thr ^taclon^iry 
plates from the Tialn ^haasis. 

(d) Check end play £.nd height of 
rotor on gear and fhaft 
assembly. 




(3) Stow Vlhr*to 


(3a) Seml-froxen bearing on gear aod shaft ^sseobly 

(b) Poor tension on drive springs of the gear 
and shaft assembly. 


(3a) Check oiling threads and 
for pvoper oiling. 

(b) Replace g^ar and shaft 
CEsembly . 




W Ko vibrato 


(4) Frozen bearing on gear and shaft assembly 


(A) Replai^e gear and shaft 
asseaibly. 




(5) SqueAlLlog SouQd. 


(3a) Tension springs of the carbon brushes els- 
positioned caualng the brushea to icake a 
aqucaklng sound against che rotor contact plna. 

Cb) Dry bearlngi 


(5a) Heat spring connection 
with soldering iron and 
spring will fall Into ic« 
proper position. 

(b) Check for proper oiling. 





12 



PARTS LIST 



Syn. Motor & Scanner 



B Oil Cup Assembly 



064-016844 



Oil Felt 



D Felt Retainer Spring 



012-002996 



Screws (3) 
Screws (2) 



Shielded lead and Cover Assembly 



066-033247 and 066-033248 



H Brush Lug & Insulator Assembly 



End Brush Spring Assembly 



066-016821 



Brush Assembly 



066-016958 



K Screws (2) 



846-040314 



L Screw (1) 

M Housing Cover Assembly 
N Screw (4) 



Cable Clip 



Stationary Plate (16) 



066-016829 



Rotor Assembly 



066-016828 



R Screws (16) 



816-080720 



Insulators (16) 



036-016747 



Insulators (16) 



045-021942 



U Front Plate Assembly 



V Bristol Set Screw (2) 



999-002032 



W Gear Housing Assembly 

4 

X Screws (4) 



Gear & Shaft Assembly 



018-033192 and 018-033193 



-13 



SCANNER REMOVAL. DISASSEMBLY MD REPAIR PfiOCEJXJRE 



Q) 



DETACH MOTOR AND SCANNER ASSEMBLY (A) FROM THE GENERATOR ASSEMBLY BY REMOVING FOUR 
NUTS FROM THE SYNCHRONOUS MOTOR WHICH ANCHORS THE MOTOR TO THE L BRACKETS OF THE 
GENERATOR ASSEMBLY. 



iH) 



(2) 

(3) 

(4) 



(5) 



REMOVE THE CABLE CONNECTIONS IN THE ORGAN SO MOTOR AND SCANNER ASSEMBLY IS FREE FROM 
ORGAN. 

NOTE A. C, LINE BOX^ AND OUTPUT CONNECTIONS FOR REASSEMBLYi 

LOCATE OIL CUP (B) AND OIL FELT (C) INSIDE CUP. THE OIL FELT MUST BE REMOVED AND THE 

COTTON THREADS UNWRAPPED FROM THE FELT BEFORE SEPARATING THE SCANNER AND MOTOR. REMOVE 

FELT RETAINER SPRING (D) AND LIFT UP ON THE FELT TO REMOVE THE THREADS. 'DO THIS VERY 
CAREFULLY TO AVOID BREAKING THE COTTON THREADS). 

AFTER REMOVING THE THREADS FROM THE OIL FELT TAKE A PICK OR A PAPER CLIP AND REMOVE 
THE THREE THREADS FROM THE ONE SIDE OF THE OIL CUP BY PULLING THEM THROUGH THE HOLE IN 
THE CUP, THE THREAD FROM THE OTHER SIDE OF THE CUP NEED NOT BE REMOVED. 

LOCATE SCREWS (E) WHICH HOLD THE MOTOR AND SCANNER^ASSEMBLY TOGETHER. REMOVE THE SCREWS 




(6) 



AND PULL THE MOTOR AND SCANNER ASSEMBLY APART. NOTE: THERE IS A GEAR ON THE END OF THE 
MOTOR SHAFT AND MUST BE GUIDED THROUGH THE HOLE OF THE SCANNER HOUSING TO SEPARATE THE 
MOTOR AND SCANNER. 

REMOVE TWO SCREWS (F) FROM THE REAR COVER (6) Of- THE SCANNER. BEFORE REMOVING THE COVER 
NOTE THAT THERE IS A SHIELDED WIRE ATTACHED TO THE COVER. THIS WIRE IS CONNECTED INSIDE 
THE SCANNER AND THERE IS VERY LITTLE SLACK IN THE WIRE, REMOVE THE COVER AND TIP IT BACK 
CAREFULLY SO YOU CAN SEE INSIDE. LOCATE THE CARBON BRUSH AUDIO PICK-UP ASSEMBLY (J). 
THE CARBON BRUSHES MUST BE REMOVED BEFORE THE MAIN HOUSING ASSEMBLY COVER (f1) IS REMOVED^ 
IN ORDER TO PREVENT DAMAGE TO THE CARBON BRUSHES AND TENSION SPRINGS, LIFT END BRUSH (I) 
AND SLIP THE TWO CARBON BRUSHES (H) OFF THE ROTOR CONTACT PIN, (BE EXTREMELY CAREFUL OF THE 
ROTOR CONTACT PIN DURING DISASSEMBLY SO YOU DO NOT BEND OR BREAK THE PIN). 




14 




(7) 



(8) 



(9) 
(10) 



Cll) 



(12) 



(13) 



SHOULD IT BE NECESSARY TO REMOVE THE CARBON BRUSH AUDIO 
PICK-UP ASSEMBLY (J). DESOLDER THE AUDIO WIRE FROM THE 
BRUSH ASSEMBLY AND RFMOVE THE TWO (2) SCREWS (K) . TO RE- 
MOVE THE END BRUSH (I) REMOVE SCREW (L) AND SEPARATE FROM 
THE BRUSH ASSEMBLY, 

REMOVE THE FOUR C4) SCREWS (n) AND SLIP THE HOUSING COVER (M) OFF THE MAIN ASSEMBLY, 
NOTE: MARK THE HOUSING COVER (M) AND THE MAIN ASSEMBLY CHASSIS (U) TO INDICATE THE START- 
ING POINT OF THE SCANNER CABLE. ALSO MARK THE LOCATION OF THE CABLE CLIP (0), 

STATIONARY PLATES (P) AND ROTOR (Q) ARE MOUNTED ON THE MAIN ASSEMBLY CHASSIS (U) . REMOVE 
TWO (2) OF THE STATIONARY PLATES (P), BY REMOVING SCREWS (R) , WHEN REMOVING THE STATION- 
ARY PLATES FROM THE ASSEMBLY YOU WILL NOTICE THAT THERE ARE INSULATOR (S) AND (T) ON BOTH 
SIDES OF THE MAIN ASSEMBLY CHASSIS, INSULATING THE STATIONARY PLATES FROM THE ASSEMBLY (U) 
THEN REMOVE THE ROTOR ASSEMBLY (Q) BY LOOSENING THE TWO (2) BRISTOL TYPE SET SCREWS (V). 
TO AVOID DAMAGING THE ROTOR CONTACT PIN DURING DISASSEMBLY. 

REMOVE THE REMAINING (14) STATIONARY PLATES AND INSULATORS. 

CLEAN THE STATIONARY PLATES, ROTOR PLATES AND OTHER METAL PARTS USING A FREON SPRAY OR 
OTHER CLEANING SOLVENTS THAT DO NOT LEAVE ANY RESIDUE AFTER DRYING. AN ABSORBENT CLOTH 
OR SWAB CAN BE USED IN CONJUNCTION WITH THE CLEANER- 
CAUTION; DO NOT ALLOW SPRAY 



SPRAY METAL COATED PARTS WITH KRYLON CORONA DOPE (CLEAR), 

TO GET ON OIL THREADS OR ROTOR PICK-UP PIN, 

IN MOST SCANNER REPAIR YOU NEED NOT GO FURTHER IN DISASSEMBLY THAN STEP NUMBER ELEVEN (U) 
BUT SHOULD CONDITIONS WARRANT FURTHER DISASSEMBLY CONTINUE WITH NUMBER (13). OTHERWISE 
INSTALL NEW INSULATORS AND REASSEMBLE THE SCANNER. 

IN REMOVING THE GEAR HOUSING ASSEMBLY (W) THERE ARE FOUR (4) SCREWS (X) HOLDING THE 
ASSEMBLY ON TO THE MAIN ASSEMBLY CHASSIS (U). UPON REMOVING THE GEAR HOUSING ASSEMBLY 
YOU WILL NOTICE THE BAKELITE GEAR AND SHAFT ASSEMBLY (Y) . THE SPRINGS ON EITHER SIDE 
OF THE BAKELITE GEAR ALSO INTERMESHES WITH THE METAL GEAR OF THE SYNCHRONOUS MOTOR TO 
DRIVE THE SCANNER. 

(14) TO REASSEMBLE THF SCANNER REVERSE THIS PROCEDURE, 






1 



HOOO-006059-PL 



9/83 



PRiNTED»NU.S.A. 



HAMMOND ORGAN COMPANY 




OMMUNIC*tlONS