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ATARI HOME COMPUTER

FIELD SERVICE MANUAL

4 0/S

ATARI believes that the information described in this manual is accurate and reliable,
and much care has been taken in its preparation. However, no responsibility, financial
or otherwise, shall be accepted for any consequences arising out of the use of this
material. Information contained herein is subject to change. Revisions may be issued
to advise of such changes and/or additions.

Correspondence regarding this document should be forwarded to Manager of Technical
Support, Consumer Product Service, ATARI, Incorporated, 1312 Grossman Road,
Sunnyvale, CA 94086, U.S. America.

TABLE OF CONTENTS

Section Title Page

INTRODUCTION ix

1 THEORY OF OPERATION l-I

Overview l-l

User Interface 1-2

*00/S00 Mechanical Description 1-3

Motherboard 1-4

Central Processing Unit 1-5

ROM Personality PCB 1-5

RAM PCB 1-5

Keyboard 1-6

Power Supply 1-6

Program Cartridge 1-6

*00/800 Electronic Discussion 1-7

Central Processing Unit 1-7

CPU 6502 Integrated Circuit 1-7

Alphanumerical Television 1-S

Interface Controller

Color Television Interface 1-10

Adaptor

Grcphic Television Interface 1-10

Adaptor

I/O Decoder 1-10

Composite Video 1-10

Motherboard Console - *00 l-l 1

Pot Keyboard Integrated 1-11

Peripheral Interface Adaptor I -1 1

Key-In Key-Out Integrated 1-12

Circuit

Memory Map Decoder 1-12

I/O Decoder 1-13

Motherboard Console - 800 1-U

Bi-directional Data Buffer l-U

ROM Personality Board 1-15

Power Supply 1-16

ROM Cartridge 1-17

Accessories 1-17

AC Power Adaptor 1-17

TV Switch Box 1-17

'BASIC Program Cartridge 1-17

2 SILKSCREEN AND SCHEMATICS 2-1

3 TROUBLESHOOTING AND TESTING 3-1

Overview 3-1

Tests ^ 3-1

Equipment Needed 3-1

Testing With and Without 3-2

the SALT II Cartridge

ATARI Home Computer iii

TABLE OF CONTENTS (Cont)

Section Title Page

Overview of Tests 3-2

Power -Up Test 3-2

Keyboard Test 3-2

RAM and ROM Test 3-2

SALT n Menu 3-5

Color Bar Test 3-6

Any Video Test 3-7

Gray Bar Test 3-S

Keyboard Test , . . . » 3-9

Switch Test 3-9

Tone Test 3-9

Display Options 3-10

Port Test 3-10

Verify ROM Test = 3-11

RAM Test 3-12

M Test . . .-•. 3-15

Star Raider Test 3-16

Shake Test 3-16

Bumin 3-16

Description of the Other Functions 3-17

Production Test 3-17

Boot B 3-17

Examine 3-17

Adjust 3-17

Summary 3«1 7

if DISASSEMBLY/ ASSEMBLY MAINTENANCE i^-i

ATARI *00 Home Computer Console - Disassembly .»..,.. ^1

Keyboard and Power Supply Access « if-1

Keyboard Removal if-3

Power Supply Removal ti~4

CPU, RAM and Motherboard Access ^6

CPU and RAM Removal if-6

ATARI 800 Home Computer Console - Disassembly ^-S

Access to RAM Boards and if-S

ROM Board
Access to Power Supply and ^9

Keyboard Assembly

Remove Top Cover if-9

Remove the PCB Module ^-10

Remove the Power Supply „ . . i^-i 1

Access to CPU Printed Circuit Board if-1 2

Access to Motherboard ^-13

Keyboard Removal i^-l /f

ATARI Home Computer iv

TABLE OF CONTENTS (Cont)

Section Title Page

ATARI WO Home Computer Console - Assembly ^15

Module Assembly Reassembly it~l5

Keyboard Installation *-I6

Power Supply Installation ^^-16

Top Cover Installation i^-17

ATARI 800 Home Computer Console - Asc^mbly H~i7

Keyboard Assembly ^17

Motherboard Installation , i^-^7

CPU PCB Installation i^-lS

Power Supply Installation *-l 8

Module Assembly Installation Into Top Cover *-19

Bottom Cover Installation t^iS

RAM and ROM Installation *-20

Cartridge Door Assembly f^-20

PCB Contact Cleaning and Lubricating ^20

Tools Required i^-20

Procedure ^21

Visual Inspection f^-21

5 WO DIAGNOSTIC FLOWCHARTS 5-1

6 WQ/800 SYMPTOM CHECKLIST 6-1

7 800 DIAGOSTIC FLOWCHARTS 7-1

8 GAME CONTROLLERS 8-1

Joystick (X-Y Controller) S-i

Joystick (X-Y ControUer) Check 8-3

Equipment Needed 8-3

Procedure 8-3

Game Paddle 8-4

Game Paddle Controller Check 8-5

Equipment Needed 8-5

Procedure 8-5

9 PARTS LIST g.l

*00 Computer 9-2

800 Computer 9_7

10 SERVICE BULLETINS lO-l

ATARI Home Computer

LIST OF ILLUSTRATION

Figure Title " Page

1-1 ATARI *00 Home Computer Console 1-1

1-2 ATARI 800 Home Computer Console 1-2

1-3 MPU Pin Assignments 1-8

i-4 ANTIC Pin Assignments 1-9

1-5 CTIA/GTIA Pin Assignments 1-10

1-6 POKEY Pin Assignments l-ll

1-7 PIA Pin Assignments 1-12

1-8 WO Motherboard Flow Diagram 1-18

1-9 *00 Power Supply 1-19

I-IO 800 Motherboard Flow Diagram 1-20

1-1 1 800 Power Supply Flow Diagram 1-21

1-12 800 Personality Board 1-22

1-13 CPU Board Flow Diagram 1-23

I-U 8K Dynamic RAM Flow Diagram 1-2^

1-15 16K Dynamic RAM Flow Diagram 1-25

1 -1 6 Game Cartridge Flow Diagram 1-26

1-17 ATARI Home Computer System 1-27

Block Diagram

2-1 WO Motherboard Siikscreen 2-3

2-2 *00 Motherboard Schematic 2-4

2-3 400 Power Supply Siikscreen 2-6

2-^ *00 Power Supply Schematic 2-7

2-5 800 Motherboard Siikscreen 2-9

2-6 300 Motherboard Schematic 2-10

2-7 800 Power Supply Siikscreen 2-12

2-8 800 Power Supply Schematic 2-13

2-9 800 Personality Board Siikscreen 2-U

2-10 800 Personality Board Schematic 2-15

2-1 1 CPU Board Siikscreen 2-16

2-12 CPU Board Schematic 2-17

2-13 8K RAM Board Siikscreen 2-18

2-U 8K RAM Board Schematic 2-19

2-15 16K RAM Board Siikscreen 2-20

2-16 16K RAM Board Schematic 2-21

3-1 Special Graphics Test 3-3

3-2 SALT Header 3-/*

3-3 SALT II Menu 3-5

3-A Color Bar Test Screen 3-6

3-5 Any Video Test Screen 3-7

3-6 Gray Bar Test Screen 3-8

3-7 Port Test Screen 3-10

3-8 RAM TEST Screen 3-13

ATARI Home Computer vi

LIST OF ILLUSTRATION (Cont)

Figure Title Page

*-l ATARI *00 Console, Bottom Cover Screw Location *-2

^-2 ATARI *00 Console, Top Cover Removal *-3

*-3 ATARI *00 Console, Keyiaoard Removal *-4

*-* ATARI *00 Console, Power Supply Removal ^5

*-5 ATARI *00 Console, Module Assembly *-7

*-6 ATARI 800 Console, Cartridge Door - *-9

Assembly Removal

^'7 ATARI 800 Console, Bottom Cover Removal i^-10

if-S ATARI 800 Console, Module Assembly Removal *-l 1

*-9 ATARI 800 Console, Power Supply Removal (^-12

if-lO ATARI 300 Console, CPU Printed Circuit - *-13

Board Removal

'f-l 1 ATARI 800 Console, Motherboard Removal ^--15

*-12 ATARI 800 Console, Keyboard Removal ifr-l5

5-1 Keyboard Connection Chart 5-38

5-2 Defective RAM Boards 5-39

7-1 Keyboard Connection Chart 7-38

7-2 Defective RAM Boards 7-39

8-1 Joystick (X-Y ControUer) 8-2

8-2 Joystick Schematic 8-3

8-3 Game Paddle 8-4

8-4 Game Paddle Schematic 8-5

LIST OF TABLES
Table Title Page

1 -I Memory Map Selected Lines 1-13

1 -2 I/O Decoder Select Line 1-14

3-1 Port Test Legend 3-12

3-2 Defective RAM Boards 3-U

3-3 Defective RAM Identified 3-15

5-1 Clock Circuit 5-36

5-2 Defective RAM Boards 5-39

5-3 Port Test Legend 5-40

7-1 Clock Circuit 7-36

7-2 Defective RAM Boards 7-39

7-3 Port Test Legend 7-40

ATARI Home Computer vii

INTRODUCTION

The ATARI ^00/800 Home Computer"^^ Field Service Manual is organized in 10
Sections:

i THEORY OF OPERATION - overview of how the *00 and 800 Home
Computers work-

2 SILK5CREEN5 AND SCHEMATICS - electrical layouts and drawings for
major components.

3 TESTING AND TROUBLESHOOTING - overview of tests which assist in
diagnosing malfunctions.

* DISASSEMBLY/ASSEMBLY - detaUed instructions to completely
disassemble and assemble both units.

5 WO DIAGNOSTIC FLOWCHARTS - detailed procedures for
troubleshooting and repairing the *00 Computer.

6 *00/800 SYMPTOM CHECKLIST - quick reference for troubleshooting
each computer.

7 800 DIAGNOSTIC FLOWCHART - detailed procedures for
troubleshooting and repairing the 800 Computer.

8 GAME CONTROLLERS - overview of hand controller construction and
recommended test procedures.

9 PARTS LIST - detailed breakdown of all parts used in each unit.

10 SERVICE BULLETINS - section to be used to hold Field Change Orders,
Upgrade Bulletins, and Tech Tips.

This manual is designed for use by both the experienced and inexperienced service
technician. The Diagnostic Flowcharts (Sections 5 and 7) provide detailed
diagnostics and repair procedures for technicians not completely familiar with the
ATARI *00/800 Home Computers. The Symptom Checklist (Section 6) provides a
rapid repair reference for the more experienced technician.

ATARI Home Computer ix

SECTION I

THEORY OF OPERATION

OVERVIEV

The Atari *00 Computer Home Console contains the central processor unit (CPU) and
memory in the form of the Operating System (read-only-memory (ROM)) and 8K or
16K of user programmable random access memory (RAM). The console contains the
keyboard, cartridge slot, controller jacks, and serial input/output (I/O) port for
connecting peripheral devices (see Figure l-U.

rawci
oNforr

SWITCH

KiirmsAL

CONNECTOa

JACK

SYSTIM RESET
SWITCH

Figure 1-1. ATARI ^00 Home Computer Console

ATARI Home Computers

1-1

The ATARI 800 Home Computer Console contains the CPU and memory in the form of
the Operating System (iOK of read-only-memory (ROM)) and SK to i6K (standard) of
user programmable random access memory (RAM); plus two expansion sockets for
additional RAM modules (maximum ^8K). The console also contains the keyboard,
cartridge slots (2), controller jacks and a serial I/O port for connecting peripheral
devices (see Figure 1-2).

HAND

CONTtOUn

tACKS

SYSTEM HSCT

SWITCM

Figure 1-2. ATARI 800 Home Computer Console

USER INTERFACE

The ATARI *00/8G0 Home Computer Consoles are general purpose microcomputers
using the 6502 microprocessor. The ATARI i^OO/800 Consoles are the central
processing units for their respective systems. Each console comes standard with a
built-in typewriter style keyboard, 8K/16K of RAM, ROM operating systems,
connector jacks for adding peripherals and hand controllers, and a 15-foot Radio
Frequency (RF) cable for connection to the user's television set.

The controller jacks on the front of both consoles accepts the X-Y (joystick) and
paddle hand controllers available from ATARI.

ATARI Home Computers

1-2

The right side panel of the Atari *00 Computer Console contains a peripheral jack,
power ON/OFF switch, and a power jack. The channel 2/3 switch is located on the
back of the console. This switch changes the console transmission frequency to either
channel 2 or channel 3 (refer to Figure 1-1).

The right side panel of the Atari 800 Home Console contains a monitor jack, a
peripheral jack, a channel 2/3 switch, a power ON/OFF switch, and a power jack (refer
to Figure 1-2),

Both Console keyboards provide a full alphanumeric character set, cursor controls, and
special purpose keys- The alpha keys when used in conjunction with the Control
(CTRL) key become special graphic symbols. To the right of the keyboard is the power
ON light and four special control keys (refer to Figure 1-1 and Figure 1-2).
From the top to the bottom they are:

SYSTEM RESET - Interrupts whatever the computer is doing and restarts the
Operating System or Program Cartridge.

OPTION - Interrupt used by the Program Cartridge to choose among

the variations within a game or program.

SELECT - Interrupt used to select one of several games or programs

on the Program Cartridge.

START - Interrupt used to Start the game or program selected from

the Program Cartridge.

»00/800 MECHANICAL DESCRIPTION

The Atari WO/SOO Computer Home Consoles are made up of seven major functional
modu

es they are:

Motherboard

Central Processing Unit (CPU) Printed Circuit Board

ROM Personality Printed Circuit Board (Operation System) (300 Only)

RAM Printed Circuit Board(s)

Keyboard

Power Supply Board

Program Cartridge

ATARI Home Computers 1-3

The Printed Circuit Boards (PCBs) piug into sockets on the motherboard, using a
common Address Bus, Data Bus and clock lines. The various power requirements are
routed from the power supply through the motherboard to all printed circuit boards.

The keyboard connects directly to the motherboard through a ribbon connector. The
sixteen-Une Address Bus allows the microprocessor to directly address 64K of memory.
The eight-line Data Bus provides the communication and data path between the
functional modules.

Figures 1-8 thru 1-17 at the end of this section provide function block diagrams of
PCBs in the *00/800 systems.

Motherboard

The motherboard ties all components of the computer system together. It also
performs a variety of logic functions. All PCBs and connector cables plug into the
motherboard and allow communication between the functional blocks of the '^OO and
SOO Computer Consoles. The motherboard also performs the following:

• Generates a 3.58 MHz master clock for the Central Processing Unit's PCB.

• Generates the Power -ON RESET for the Central Processing Unit PCB and
the peripherals.

• Provides the driving circuitry for the Key-Press signal from the Central
Processing Unit PCB to the Console speaker.

• Converts signals from the various hand controllers into recognizable data
for the microprocessor.

• Buffers and drives the data lines between the Central Processing Unit PCB,
the RAM PCBs, and the remainder of the system.

• Does the first memory map decoding of the possible 64K address locations
into 8K blocks for the microprocessor.

•

Generates control signals for the peripheral devices.

• Receives video data from the Central Processing Unit PCB, converts it
into a composite video and routes it to the power supply PCB.

• Combines the sound from the Computer system and the audio track of
prerecorded cassettes.

• Develops the sound subcarrier for the television audio as part of the
composite video.

ATARI Home Computers 1-^

Central Processing Unit

The Centrai Processing Unit (CPU) PCB is the controller of the entire Console system.
The CPU PCB contains the 6502 microprocessor, and the ANTIC and CTIA (or GTIA)
chips. The CPU PCB controls the Console system and its peripheral devices through
address lines (to select which device it needs to communicate with) and data lines (to
transmit and/or receive data from a selected device) common to the entire system.
Operating instructions for the microprocessor come from the ROM Operating System
on the Personality PCB, Additional functions of the CPU PCB are:

• deceives the master clock from the motherboard and generates Phase 1 (/I
or Ph 1) and Phase 2 (/2 or Ph 2) clocks used to synchronize the entire
system.

• Transmits a REFRESH signal at least every 2 miliseconds to refresh the
dynamic RAM chips on the RAM PCB(s).

• Receives the four TRIGGER lines from the fire button on each of the hand
controller accessories.

• Receives the lines from the four control switches located to the right of
the keyboard-

• Generates video signals to be processed by the motherboard before they
are sent to the RF module on the Power Supply PCB.

ROM Personality PCB

The ROM Personality PCB contains information in Read-Only Memory (ROM), the
program of operating instructions for the microprocessor. Two *K ROMs contain the
Operating System, and one 2K ROM contains the arithmatic functions used for BASIC
programming. Information is retrieved from the ROMs by addressing a particular
location on the ROM using the Address Bus. The data contained at that location is
placed on the Data Bus to be read by the microprocessor.

The ROM Personality PCB also provides the CHIP SELECT signals used to select LSI
chips throughout the Console system and for the bi-directional data buffers on the
motherboard.

RAM PCB

The Random Access Memory (RAM) PCB performs the function of temporary data
storage for the system. The RAM is dynamic, requiring REFRESH, and is available in
SK or 16K versions.

Each RAM chip on the RAM PCB has only seven address lines. To address 16K
locations requires U address lines. To accomplish this, a I*-bit address is

ATARI Home Computers 1-5

sent to the address demultiplexer, which first passes the lower seven bits to the RAM
chips as a Row Address. After an appropriate delay, the highest seven bits are passed
as a Column Address. Data is then either put into or taken out of the location
selected. The direction of data flow is determined by the Read/Write line.

REFRESH occurs at least every two milliseconds. The REFRESH signal is generated
on the CPU Board.

Keyboard

The typewriter-style keyboard is used to generate alphanumeric characters as well as
special graphic symbols. The keyboard allows the operator to communicate with the
console system for writing programs or responding to preprogrammed cassettes or
cartridges. The keyboard consists of 57 normally open switches. The switches are
scanned at a rapid rate and when a switch is found closed, that scan pattern is sent to
the Pot Keyboard Integrated Circuit (POKEY) for encoding.

Power Supply

The Power Supply PCB receives 9VAC from an external power adaptor (transformer)
and provides +5Vdc, +12Vdc, and -5Vdc for the Console system. The Power ON/OFF
switch is mounted on the Power Supply PCB and removes input power by opening the
9Vac lines. An interlock switch breaks power to the system when the operator opens
the top panel of the Console to install or remove Program Cartridges.

The RF Module resides on the Power Supply PCB, The RF Module generates the RF
output for the video screen from the composite video signals received from the
motherboard, and is switchabie to television channel 2 or 3,

Voltages:

+5Vdc A - Supply voltage for the logic PCBs.

■t-5Vdc B - Specially filtered for the video circuitry,

+12Vdc and -5Vdc - Supply voltage for the dynamic RAM chips.

Program Cartridge

The Program Cartridge permanently stores the microprocessor instructions for a
particular application. It consists of two i^K ROM chips mounted on the enclosed PCB,
Information is received from the ROM chips by addressing the memory locations
assigned to the Program Cartridge slot(s). Data in the memory locations is then
placed on the Data Bus lines.

ATARI Home Computers 1-6

400/800 ELECTRONIC DISCUSSION

The remainder of this section provides a detailed discussion of the functions of the
seven major modules.

Central Processing Unit

The Central Processing Unit (CPU) PCB contains the 6502 CPU (or MPU) chip (A303),
t^c CTIA or GTIA chip (A301), the ANTIC chip (A3a2), tri-level address buffers (Z303
and Z304), and the clock generator (Z302A and Z302B).

CPU 6502 Integrated Circuit

The 6502 microprocessor contains register flags, interconnections, arithmetic logic,
and control logic, all recognized operation codes. The characteristics of the 6502
microprocessor ares

Byte-oriented structure

151 opcodes

Decima' and binary arithmetic modes

Seven addressing modes

True indexing

Stack pointer

Two interrupt levels

64K address range

Integral clock circuit

Single +5 volt dc power requirement

Figure 1-3 is an illustration of the 6502 pin assignments. The functions of the pins are
explained on the following pages.

ATARI Home Computers

1-7

vss

C i

RDY

C 2

c >

IS^

N.C

NMI

YP*C

vcc

A«

Aa ■

A«

AlO

l»

All

MCSfiMZ

RES

^(IN)

N.C

R/V

« J

AI2

AI3

Alt

22 1

A13

21 [

VSS

Figure 1-3. MPU Pin Assignments

Alphgtnumenc Television Interface Controller

The primary function of the Alphanumeric Television Interface Controller (ANTIC)
chip is to fetch data from memory, independent of the processor, for display on the
video screen.

Figure 1-4 is an illustration of ANTIC Pin Assignments.

ATARI Home Computers

1-8

GROUND VSS

CTIA Data ANJJ

CTIA Data AN I

Light Pen EP

CTIA Data AN2

Interrupt Input RNMl

Interrupt Output NMl

Refresh REF

HALT HATt

Address Bus A3

Address Bus A2

Address Bus Al

Address Bus AH

Read/Write R/W

Ready RDY

Address Bus AlO

Address Bus A12

Address Bus A13

Address Bus AH

Address Bus A15

Data Bus

ft^

Reset

FPhJf

Fast Phase C

Phtf

Phase Clock

Data Bus

Ph2

Phase 2 Clock

Address Bus

All

Address Bus

VDD

5V Power

Figure 1-^. ANTIC Pin Assignments

ATARI Home Computer

I -9

Color Television Interface Adaptor

The Color Television Interface Adaptor (CTIA) chip retrieves graphics data from
memory vU the ANTTC DMA process- This data is routed to the CTIA eraohics
registers. Figure 1-5 illustrates the pin assignments for the CTIA and GTIA,

Address Bus
Address Bus
Ground
Data Bus
Data Bus
Data Bus
Data Bus
Trigger
Trigger 1
Trigger 2
Trigger 3
Console Sw
Console Sw 1
Console SW 2
Console SW 3
PAL Color Delay
Color Delay
Alphanum. Data
Alphanum. Data 1
Alphanum. Data 2

V5S

PAL

DEL

ANO

ANl

AN2

R/W

321

C5I

CS2

PH2

FPHO

OSC

VDD

hAlT

- CSYNC

21-

LUM2

LUM 1

LUM 2

COL

Address Bus
Address Bus
Address Bus
Data Bus
Data Bus
Data Bus
Data Bus
Read/Write
Chip Select 1
Chip Select 2
Phase 2 Input
Clock Out
Oscillator Input
Power
HALT

Output Sync
Luminance 2 Output
Luminance 1 Output
Luminance Output
"Color

Figure 1-5. CTTA/GTIA Pin Assignments

Graphics Television Interface Adaptor

The Graphic Television Interface Adaptor (GTIA) is an extended capabilities version of
the CTIA, having additional high-resolution modes-

I/O Decoder

The I/O Decoder integrated circuit (ZiOl) is a one-eight decoder demultiplexer. The

Iv^?^®^®^ " ** ^"^*^ '^ *® *^° ^<^ 200' but is labeled ZlOl in the 800 Console and
Z1Q5 in the WO Console.

Composite Video

J^^.'tP^T ,^? ^.°° Motherboards route the Composite video signals (COMP CHROMA,
COMP LUM, MOD, and COMP VIDEO) to the Power Supply to build the RF videtJ
output.

ATARI Home Computers

1-10

Motherboard Console - ^QO

The *00 Console Motherboard contains the Pot Keyboard (POKEY) (AiOl) chip , the
Peripheral Interface Adaptor chip (PIA) (A102), the ROM Personality chips {A1Q3 thru
A105), the Keyboard Key-In/Key-Out analog multiplexers, the Memory Map Decoder
(Z103), the controller jacks (JlOl thru JIO*), the CPU connector jack (JllO), the
Keyboard connector jack, RAM connectors and Cartridge connectors-

Pot Keyboard Integrated Circuit

The Pot Keyboard Integrated Circuit (POKEY) provides the Interface between the
Keyboard, the Serial I/O ports, and the microprocessor. It also contains four semi-
independent audio channels, each with its own frequency, noise, and volume control.
Figure i-6 shows the pin assignments of the POKEY.

Ground
Data Bus
Data Bus
Data Bus
Data Bus
Data Bus
Phase 2 Clock
Put Scan
Pot Scan
Pot Scan
Pot Scan
Pot Scan
Pot Scan
Pot Scan
Pot Scan
Keyboard Scan
5 V Power
Keyboard Scan
Keyboard Scan
Keyboard Scan

VSS

VDD

AUDIO

R/W

CSl

CSQ

IRQ

SOD

OCLK

BCLK

KRl

SID

Data Bus
Data Bus
Data Bus
Audio Out
Address Bus
Address Bus
Address Bus
Ac^iiress Bus
Read/Write Control
Chip Select
Chip Select
Interrupt Request
Serial Output Data
Serial Output Clock
Bidirectional Clock
Keyboard Scan
Serial Input Data
Keyboard Scan
Keyboard Scan
Keyboard Scan

Figure 1-6. POKEY Pin Assignments

Peripheral Interface Adaptor

The Peripheral Interface Adaptor (PIA) (6520) has two 8-bit programmable I/O ports
and two control bits for each port, for a total of ten lines per port. Figure 1-7 shows
the pin assignments of the PIA.

ATARI Home Computers

l-ll

^ l—

PAT

PAl

PA2

P«

PA*

PA«

p^r

PBI

PB2

PBS

PB«

1«

PB7

17
IS

■L

-c

1»

vcc m

■ c:

MCSU20

40
39
3S
37
3«
33
3*
33
32
31
30
2f
2S
27
2S
23
2*
23
22
21

n** — ^cAi

^ ■ »• CA2

—J , „„ ^ iR^

3 ^ iRQB

3 -^ RSI

n-* M»

3
J.
1
3

3
3
3^

3-»-

3^
3^

ENABLE

CSl

CS2

R/ir

Figure 1-7. PIA Pin Assignments

Key- In Key-Out Integrated Circuits

These two *051 (ZlOl and Z102) integrated circuits are used to scan the Keyboard for
input data on the '^00 and 800 Computer Consoles. The *051 integrated circuits are
analog multiplexers controlled by the input lines A, B, C and X.

Memory Map Decoder

The Memory Map Decoder integrated circuit (Z103) on the 400/800 Motherboard is a
one-of-ten decoder. Four input lines (pins 12, 13, and U, and 15) determine which
output line is selected. The 400/800 Computer Console uses only three of the input
lines (pins 13, 14, and 15 and pin 12 being grounded) for a total of eight selected output
lines (SO -S7), Refer to Table l-I for the line selected for each input combination.

ATARI Home Computers

1-12

Table 1-1

Memory Map Selected Lines

Signal -Grd

A15

Al*

A13

Active

Pin - 12

Line

Device

1-SO

8K RAM BLOCK

2 -SI

8K RAM BLOCK

3-S2

8K RAM BLOCK

*-S3

8K RAM BLOCK

5-S*

8K RAM/CARTRIDGE L,R

6-S5

8K RAM/CARTRIDGE L

7 -56

2K ROM

7-S6

I/O DECODER (Z105)

9-S7

*K ROMs (2-"E" <Jc "A")

I/O Decoder

The I/O Decoder integrated circuit (2105) is a one-of-eight decoder /demultiplexer.
The I/O Decoder is used to select the different output devices, such as PIA chip,
^^*^^y/^^P ^^ ^^« ^'^*^/*^T^A chip. Only four of the possible output selections are
used. (See Table 1-2.) The I/O Decoder Is enabled by inputs on pins *, 5, and 6; pin *
input coming from the Memory Map Decoder (S6), pin 5 input coming from the Address
Bus and pin 6 input coming from the Chip Select (CS) line. The Binary Decode is
provided by the Address Bus (A08, AQ9 and AlO),

ATARI Home Computers

1-13

Table 1-2

I/O Decoder Select Line

Enable

Binary Decode

A12 All
Pin 6 6

AIG
3

1 A59

Active

Device
Selected

YO-15

CTIA

Not used

Y2-13

POKEY

Y3 -12

PIA

Not Used

Y5-10
9

External Select
Not Used
Not Used

Motherboard Console - 800

Read descriptions provided in Motherboard Console - 400, for items similar in both the
i^00 and SOO Console Motherboards- The following paragraphs describe those items
unique to the 800 Console Motherboard.

The 800 Console Motherboard contains the POKEY chip (AiOl), the PIA chip (A102),
/^?n'!^f^'^^^ Key-In/Key-Out analog multiplexers (2103 and 2104), the I/O Decoder
-nn? ' S^-^i^^c^ional Data Buffers (2105 and 2106), the controUer jacks (JlOl thru
M.nJ' 5 Jj^n^Jj^^*""^ connector jack (3106), the left and right Program Cartridge jacks
^ S^^^^^.^l^^L^^*" ^^^ connector jaci' (JlOl), the ROM Personality connector jack
U107J, and the RAM Memory connector jacks (3102, J103, and JiQi^), See Fieures 1-1 1
and 1-12. *

Bi-directional Data Buffer

The Bi-directional Data Buffers (Z105 and Z106) are 74LS243 quad transceivers,
commonly referred to as tri-level buffers. Tri-level refers to the three levels that can
occur in the device; the first level pin 1 going high and pin 13 staying low, allows data
to tlow through the data buffer in the direction of the CPU; the second level, pin 13
going high and pin 1 staying low, allows data to flow through the data buffer in the
direction of the POKEY chip, the PIA chip and the Personality PCB; the third level,
with pin 1 and pin 13 both staying low, creates a high impedance condition in the data
buffers and allows other devices to transmit data on the Data Bus lines. This high
impedance state also isolates the CPU and the RAM PCB from noise generated from a
device using the Data Bus lines.

ATARI Home Computers

1-U

ROM Personality Board

The ROM Personality printed circuit board plugs into connector Jack 3107 and
occupies memory locations D800 thru FFFF. The Personality board contains the
operating system on three ROM chips, two 4K chips and one 2K chip (see Figures 1-13
and 1-U). The two *K ROM chips (A^Ol and A403) contain the I/O subsystem,
interrupt processing, initialization Power-Up and Reset. The 2K ROM chip (AW2)
contains the floating point arithmetic package.

• I/O Subsystem

The I/O subsystem contained in the ROM Operating System provides a
high-level interface between the user programs and the Console and
peripheral hardware. All peripheral devices capable of dealing with
character data have symbolic names (such as K, D, P, E) and may be
accessed using a Central I/O (CIO) routine.

• Interrupt Processing

All hardware interrupts are handled by the interrupt subsystem in the
Operating System. Vectored addresses contained in RAM memory point to
subroutines in ROM to handle each type of interrupt.

• Initialization

There are two levels of initialization provided by the system, Power-Up
and Reset. Power-Up initialization is performed each time the system
power is turned on, and Reset initialization is performed each time the
Reset key is pressed.

Whenever the system power is turned on, the Operating System examines
and notes the configuration of the unit. The Operating System performs
the following actions at Power-Up:

Determines the highest available RAM address

Clears all RAM to zeroes

Establishes all RAM interrupt vectors

Initializes the ROM Cartridges

Sets-up the video screen (2^ x i4-0 text mode)

Boots the cassette if desired

Checks ROM Cartridge for disk boot instructions

Boots the disk if desired and a disk drive is attached

Transfers control to the ROM cartridge, and booted program

ATARI Home Computers 1-15

Whenever the Reset key is pressed, the Operating System performs some, but not
ail, of the functions performed at Power-Up. The Operating System performs
the following actions after the Reset key is pressed:

Clears the Operating System portion of RAM memory

Re-establishes all RAM interrupt vectors

Formats the Handler Address table

Initializes the ROM Cartridges

Sets-Up the video screen for 2* x *0 text mode

Transfers control to the ROM Cartridge and booted program

The remaining 2K of Operating System ROM is a floating point program which is
not used by the other parts of the Operating System itself, but is available to
non-resident programs such as BASIC, Calculator, PASCAL, etc. The following
routines are among those found in the ROM program;

ASCII to floating point and floating point to ASCII conversion

Integer to floating point and floating point to integer conversion

Floating point log, exponent, and ploynomial evaluation

Floating point number clear, load, store and move

POWER SUPPLY

The ifOO and SOO Power Supply have identical circuitry, with a few exceptions (See
Figures 1-9 and 1-11). The Console Power Supplies receive 9Vac (J20* and J206, i*00
and 800 respectively) from the external power adaptor (transformer) provides +5Vdc,
and ■i-12Vdc, and -5Vdc for the Console. Both the ^00 and 800 Power Supplies have two
power ON/OFF switches, S202 and S203 for the ^^00 Console, and S201 and S202 for the
800 Console. S202 and S201, respectively, are Power Interlock switches.

The RF signal is generated in both the 400 and 800 Power Supplies from the MOD
signal received from the motherboard. It is routed through the A203 RF Module to
develop the RF output through J203.

A peripheral connector jack, 3202 for the *00 Console and J204 for the 800 Console,
provides the serial data-in /data-out port for the system. Devices are "daisy chained"
together from this output port. Each peripheral device is identified by a unique
address, enabling all devices to reside on one output port.

Also contained on the 800 Power Supply board is the Monitor connector jack (3205).
Present at 3205 are the composite video signals to drive a video monitor. The 800
Power Supply board also contains switches S204 thru S207. These switches are the
System Reset, Option, Select, and Start, respectively.

ATARI Home Computers 1-16

ROM CARTRIDGE

The Atari ROM Program Cartridge contains two ROM chips designed to provide a
specific program application (See Figure 1-16). The 6502 microprocessor reads the
information contained within the ROM chips by addressing memory locations SOOO thru
BFFF Hex. When the ROM Program Cartridges are inserted in the motherboard, they
disable the RAM address locations 8000 thru BFFF, in SK increments. The left ROM
Cartridge overlays memory locations AOOO to BFFF, and the right ROM Cartridge
overlays locations 8000 to 9FFF.

ACCESSORIES

AC Power Adaptor

The AC Power Adaptor plugs into a standard wall outlet to provide the 9Vac used by
the Consoles. The other end of the power adaptor plugs into the power jack on either
Console.

TV Switch Box

The TV Switch Box allows the Console to be connected to the 300 ohm RF antenna or
75 ohm cable inputs on a typical televison set.

'BASIC Program Cartridge

The 'BASIC Program Cartridge (provided) is a standard feature for both Consoles and
contains the ATARI BASIC Interpreter.

ATARI Home Computers 1-17

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ATARI Home Computers

1-18

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ATARI Home Computers

1-19

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1-20

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ATARI Home Computers

1-21

ADDRESS DECORDER/
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ATARI Home Computers

1-2*

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ATARI Home Computers

1-25

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ATARI Home Computers

1-26

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ATARI Home Computers

1-27

SECTION 2
Sa.KSCREEN AND SCHEMATICS

The following pages contain representative silkscreens and schematics for the ATARI
*00/800 Computer Consoles. Minor variations in design may be encountered depending
upon the production date of the Console. These drawings provide all details required
for an in-depth understanding of both the *00 and 800 Consoles-

ATARI Home Computer 2-i

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ATARI Home Computer 2-2

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ATARI Home Computer

2-3

Figure 2-2. *00 Motherboard Scehmatic
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ATARI Home Computer

2-^

Figure 2-2. WO Motherboard Scehmatic
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ATARI Home Computer

2-5

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ATARI Home Computer

2-6

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ATARI Home Computer

2-7

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ATARI Home Computer 2-8

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ATARI Home Computer

2-9

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ATARI Home Computer

2-iO

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ATARI Home Computer

Figure 2-6, 800 Mother Board Schematic
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ATARI Home Computer

2-12

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ATARI Home Computer

2-13

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ATARI Home Computer

2-U

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ATARI Home Computer

2-15

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ATARI Home Computer

Figure 2- U. CPU Board Siikscreen

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ATARI Home Computer

2-17

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ATARI Home Computer

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ATARI Home Computer

2-19

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ATARI Home Computer

2-20

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ATARI Home Computer

2-21

SECTION 3

TROUBLESHOOTING AND TESTING

OVERVIEW

This section describes the procedures to maintain, troubleshoot, and test the ATARI
*00/800 Computer Consoles. The section is divided into two major categories:

1. TESTS

2. TROUBLESHOOTING

TESTS

The following discussions pertain to the troubleshooting procedures required to
checkout the ATARI &00/800 Home Computer Consoles.

Equipment Needed

You

ATARI

■equire six basic pieces of equipment in order to analyze the failures of the
' i^OO/800 Home Computer Console. These items include:

15MHz oscilloscope

Stand Alone Test Cartridge (SALT II)

Peripheral Port Test Connector

Hand Controller Jack Test Connector

Television Set (properly adjusted)

Small Tool Kit

ATARI Home Computer

3-1

Testing With And Without The SALT II Cartridge

All tests are reviewed in this section. Procedures for the use of the tests are detailed
in Section 5, *00 Diagnostic Flowchart, and Section 7, 800 Diagnostic Flowchart.

OVERVIEW OF TESTS

A variety of test routines assist you in identifying probable sources of problems within
the computer console.

Power-Up Test

This test prepares the Console for the remainder of the tests. Should the Console fail
this test, no other test results can be considered valid.

• Format: Connect the power adaptor to the Computer and the Computer to
the television set. Make sure there is not a cartridge in the console —turn
the POWER switch ON. The words ATARI COMPUTER - MEMO PAD
should appear on the screen in the upper left corner.

Keyboard Test

This tesx verifies that all keys of the keyboard are properly functioning. This test -Iso
verifies that the POKEY chip's keyboard functions are operating properly. If one key
faUs, then the problem is Ukely the keyboard. If more than one key fails, you must
perform further tests. (These tests are discussed later in this section.)

• Format: Depress each key of the keyboard. As you press each key, watch
the screen to verify if the computer is echoing the key. Be certain to use
the CTRL key with other keys. This checks special graphics functions not
tested elsewhere (See Figure 3-1).

RAM and ROM Test

This test verifies that the CPU, RAM, and ROM chips are ail properly functioning.

• Format: Due to the possible complexity of this test, it has been broken
into four subsections.

I. Turn the POWER off, insert the SALT II cartridge (for the 800, use
the left cartridge slot), and turn the POWER on. The SALT Header
should appear on the television screen (See Figure 3-2). This verifies
that the CPU, Operating System (OS) ROMS, and the lower RAM are
functioning.

ATARI Home Computer 3-2

DO THIS

PUSH PUSH

SEE THIS

PUSH

PUSH SIMULTANEOUSLY

PUSH

PUSH SIMULTANEOUSLY

Figure 3-1, Special Graphics Test

ATARI Home Computer

3-3

ATARI 400/800
STAND ALONE
SYSTEM TEST

REV 2 04

(Type ?

RAM:40K TIA NTSC
ROM: MATH NTSA:NTSA

Figure 3-2. SALT Header

i^.

If a green/yellow colored screen is returned, this indicates a probable
OS ROM malfunction. Swap-out the ROM set with a known good set
(make certain to test after each ROM is replaced), this allows you to
pinpoint the defective ROM.

If the words, SYSTEM FAILURE appear on the television screen, this
indicates that the lower RAM is not functioning. When this happens
and a *00 Computer is under test, turn the POWER off, swap-out the
RAM board with a known good one and turn the Power on. If the
SALT Header is returned to the screen, this indicates a probable
malfunction in the RAM board which was removed. Refer to the
DIAGNOSTIC FLOWCHARTS, Section 5 and 7 for troubleshooting
procedures.

If the 800 Computer is under test, turn the POWER off and swap-out
the front RAM Card with a know good one. Place the suspected
defective RAM CARD into the number 2 RAM slot (the third slot
behind the OS), and turn the POWER back on. This lets the SALT II
cartridge troubleshoot the suspected RAM CARD later in the
DIAGNOSTIC FLOWCHARTS.

If RAM and ROM boards have been swapped and the condition
continues to persist, swap the CPU board with a known good board to
isolate the problems.

ATARI Home Computer

3-4

* • * NOTE * * »

Once you have isoJated the problem to either the RAM, ROM, or
CPU boards, clean the board edge connectors and retest the boards.

The SALT 11 cartridge takes you through the next phase of tests. Use the SALT II
cartridge to perform the following tests.

SALT n Menu

Figure 3-3 illustrates the SALT II menu of tests. The highlighted character in Figure
3-3 is red on the screen and is the command letter for each test.

ANYV
COLO

Keyb

IPORT

mi
mi

2 PRO

HELP

IDEO
RBARS

TEST

IBOOT B
IDT SPLAY

LIGHT PEN
?HELP

DUCTION TEST

Figure 3-3. SALT II Menu

ATARI Home Computer

3-5

Coior Bar Test

This test verifies and allows for adjustment to the color circuitry. With SALT II
properly in place, enter the command letter C and press RETURN, Figure 3-^ is a
biack and white representation of what your television display screen should look like.

REFERENCE BAR

SAME COLOR

Figure 3-*. Color Bar Test Screen

A l5-color rainbow scale is displayed above the reference bar with a single color bar
below. The color bars directly above and below the reference bar should be the same
color (golden rod). If not, proper adjustment of R309 makes the color bars above and
below the reference bar identical thus adjusting the coior frequency of the console to
the proper setting.

ATARI Home Computer

3-6

Proper operation of the unit is indicated by you being able to make this adjustment and
by consistent color within the entire span of each bar on the screen. Minor glitches on
the edges of the color bars are acceptable. Leave this test on for at least 60 seconds
in order to catch any intermittent problems, such as a bar momentarily changing
colors or blanking out.

Any Video Test

This test verifies the console's ability to generate a video (TV) display. This test also
checks for pattern sensitivity of the rvNTIC chip.

By entering the command letter A and pressing RETURN, this test is activated.

Figure 3-5 illustrates the screen display for the Any Video Test. NOTE: Figure 3-5 is
a black and white representation of a colored screen.

The screen should have a black background with eight vertical bars. Half of the
vertical bars should be narrow, and the other half, much wider. A horizontal bar
should appear across the top of the screen. From the left to right, the shade of color
on the horizontal bar should change. On the right of the bar, two Vs should be
displayed, right side up; one in normal video and the other in inverse video.

Figure 3-5. Any Video Test Screen

ATARI Home Computer

3-7

Gray Bar Test

This test verifies that the CTIA (GTIA) is generating the three LUM iines.

By pressing the command letter G and then RETURN, this test activates.

Figure 3-6 iiiustrates the screen display of the Gray Bar Test. The screen is divided
into eight equal sized horizontal bars. The bar at the top of the screen should be black
and subsequent bars should progress to white at bar eight. The bars should lighten in
even shades. The screen should be steady and unchanging. These lines may have minor
glitches at their edges. A thin white line should always appear just over the top
(black) bar. No color should appear anywhere on the screen. The areas above the top
(black) bar and below the bottom (white) bar are of no importance to this test. This
test should be left on for at least 60 seconds to ensure that there is no "flashing" of
color or shifting of the gray bars.

Figure 3-6. Gray Bar Test Screen

ATARI Home Computer

3-8

Keyboard Test

This test verifies the Console's ability to accurately accept operator input from the
keyboard.

By pressing the command letter K and RETURN, this test is activated. You are to
press each of the keys EXCEPT, the SPACE BAR, CNTL and both SHIFT keys. Each
letter pressed is returned to the display screen. Once this portion of the test is
completed, hold down the CNTL key and press the lette r A. The letters CTRL are
returned to the screen. Now, hold down the left SHIFT key and press A. The word
SHIFT is re turne d to the screen. By holding down the right SHIFT key and pressing A,
the word SHIFT is again returned to the display screen. Finally, press the SPACE BAR
and then, RETURN. The words KEYBOARD PASS or KEYBOARD FAIL appear on the
screen below the keyboard test. If the SALT II cartridge detects any key failures
during the test, the defective keys appear on the screen in the color red.

Switch Test

This test verifies the proper operation of the four Console Switches (START, SELECT,
OPTION, and SYSTEM RESET). By pressing the command letter S and pressing
RETURN, this test is activated. Press the console switches in the following order: 1)
START; 2) SELECT: 3) OPTION; and ^f) SYSTEM RESET. Upon pressing SYSTEM
RESET, either PASS or FAIL is returned to the screen.

Tone Test

This test verifies the ability of the POKEY to generate four sound registers through its
sound generation circuits. Press the command letter T and RETURN. A prompt
(question) is returned to the screen asking you which register you want to test. You
must press the key with the number of the register you want to test (1, 2, 3, or *) and
then press RETURN-

The test generates eight tones in descending order. The first three tones are very nigh
and may be inaudible to some people. Each tone begins at maximum volume and fades
to minimum volume. You must enter the command letter before each register test.
Make certain to test all four sound registers.

NOTE: The television volume control may have to be turned up in order for you
to hear the first three tones.

ATARI Home Computer 3-9

Display Options

This function, which is not a test, displays a diagnostic matrix when used in
conjunction with either the RAM TEST or the PORT TEST. It allows you to identify
which ROM chip has failed when used with the VERIFY ROM TEST.

By pressing command letter D and RETURN you access this function. The screen
returns the prompt to enter a test format, To use the PASS/FAIL indicator, enter the
command letter P and press RETURN. To display the ERROR TABLE, enter the
command letter E and press RETURN. For the following PORT, VERIFY ROM, and
RAM TESTs, press the command letter E and RETURN. The screen prompts you to
enter the command letter S for a single test, or C for continuous testing.

You are now ready for the three tests. To terminate any of the following three tests,
press the SPACE BAR. NOTE; The RAM test completes its current test before
stopping.

Port Test

This test verifies the ability of the computer system to communicate through the
controller jacks and the peripheral I/O port.

The command letter P and RETURN activates this test. Make certain that the
Peripheral Jumpers are in place, and press RETURN again. Figure 3-7 illustrates the
Port Test Matrix Display. This figure is a biack and white representation of a color
television screen. The zeros should be a blue tint.

0000
0000
0000
0000

210
000
000
0000

8888

0000

0000 0000
0000 0000
PORT TEST

ERROR
COUNTER

TEST
COUNTER

Figure 3-7. Port Test Screen

ATARI Home Computer

3-10

The four digit number in the lower-right corner of the dispiay screen shows the number
of tests completed. In addition, the four digit number above it in red is an error
counter which indicates the number of times the test has failed.

If a failure occurs, a Red 1 is displayed in the matrix, this shows you the location of
the errored condition. Table 3-1, Port Test Legend should be used to determine the
cause of the failure condition. (Please note, a blinking 1 at location A 5 does not
indicate a failure.)

A passing condition for all test is indicated by a in that location (i.e., CO or D*). If
the failed test passes on the next pass, the 1 is replaced by a 0. The error counter in
the lower-right corner of the screen increments by one for each error .

Verify ROM Test

This test checks the Console's ROMs by performing checksum tests on them. By
entering the command letter V and pressing RETURN you activate this test. The
screen displays a checksum for each ROM and the value returned by the MATH PACK
together with a PASS or FAIL indicator for each. • Upon completion of the test, the
screen displays VERIFY ROM and either PASS or FAIL for the entire test. This test
can be used to pinpoint which ROM is failing. If you suspect a ROM is intermittently
failing; run this test for 15 or 20 minutes.

RAM Test

This automatically uses six different tests to verify the operation of the RAM boards-
Enter the command letter R and press RETURN to begin this test. A prompt is
returned to the screen asking how many 8K blocks of memory to check (maximum of
five). Type the number of memory blocks in the unit and press RETURN. (Remember
that, 1 equals each 8K RAM card and 2 equals each 16K RAM.)

The computer displays the amount of RAM it is testing. If the amount is not what you
entered, one of two conditions may exist: 1) the unit does not contain tne amount of
memory you thought it did; or, 2) the unit has defective RAM card(s).

Figure 3-8 Ulustrates a defective RAM test system response screen. The four digit
number in white at the bottom right of the screen indicates the number of tests
completed. A red four digit number directly above this is used to count the number of
failures.

ATARI Home Computer 3-1 1

Table 3-1

Port Test Legend

!.-:

« -3

S s h

S.-s

3^«
S -«

-t

P ft ~

Z 35

3£

<auQ»CBioa:

ATARI Home Computer

3-12

As was the case with the PORT Test, failures appear as Red Is in this display. If the
pattern is in a state of constant change, one of the RAM boards probably has a set of
defective 7*LS158 chips. If you replace the chips make certain that the new chips
have the same manufacturer and the same date code. This ensures compatibility. To
determine which board(s) is(are} defective, perform the following three steps:

1) Turn off the power,

2) Remove one of the boards.

3) Start the test from Display Options, page 3-10.

If the pattern is stable, look at line B, Columns * thru 7 to determine which board is
defective, (See Table 3-2).

D
E

0100
0001
0000
0000
RAM

0000
1000
0000

TEST

TESTING 40 K

0004-
0004

ERROR
COUNTER

TEST
COUNTER

Figure 3-S, RAM Test Screen

ATARI Home Computer

3-13

Table 3-2

Defective RAM Boards

Defect

Indicator Description

Bifr ist SK Block

2nd 8K Block

B5; or

B4 and B5

B6;or

B* and B6

B5 and B6;

Ba, B5 and

B7; or

B4 and B7

3rd 8K Block

*th 8K Block

5th 8K Block

Compare rows D and E, if there is a difference between any one column use Table 3-3
to identify specific defective chips. If more than one column is different replace the
7£fL52^4 chip and retest.

ATARI Home Computer 3-Iif

Table 3-3

Defective RAM Identifier

Difference

Column

Description

I6K

Z512

Z5U

Z510

ZJ08

Z509

Z5(j4

Z507

Z505

Z506

ZJ05

M Test

P?i?-,^*^^ ^*^^^®5 ^^® proper operation of the Video Buffer Chip (400-Aill and 800-
A103},

To perform this test, turn off the Console POWER, remove the SALT II cartridee and
insert the BASIC cartridge. Turn the POWER on and perform the following three
entries; ®

ATARI Home Computer 3-15

1) Type: NEW and press RETURN.

2) Type: 10?"M-; :GOTO 10 and press RETURN.

3) Type: RUN and press RETURN-

The system starts printing Ms, character after character, line after line- If any are
blurred and/or nin together, the Video Buffer Chip or another of the discrete
components in the video summing circuitry on the mainboard is probably defective.

To stop this test, press BREAK or SYSTEM RESET,

STAR RMDEr'^^ Test

If the Console has effectively passed all previous tests and performs this game without
any visible problems, it is almost certainly operating properly.

Turn POWER off, remove the BASIC cartridge, insert the STAR RAIDER^^ cartridge,
and turn the POWER on. Now, go through the game's various screens and functions

(play the game).

Shake Test

Grasp the unit firmly with both hands and shai<e it vigorously for approximately 10 to
20 seconds. DO NOT HIT or STRIKE the unit against the bench or other hard object
without having your fingers between the unit and the surface being struck. Perform
the MEMO PAD test to make certain that none of the connections, boards, and/or
components have become unseated, and that the unit is properly operational.

Burn in

After the unit has successfully passed all the previous procedures and is operating
correctly, it is ready for burnin

Burnin consists of operating the system continuouisly for a long period of time
(recommended S hours). Use one of the following three methods.

i) Insert the SALT II cartridge and run it with continuous RAM or PORT test.

2) Insert Star Raider or another game cartridge and run it.

3) Perform the ^tOO/SOO Console Test (810 Disk Drive required).

ATARI Home Computer 3-16

At the end of the BURN-IN period, check the unit again for any malfunctions, using
SALT II Test checks. Once the unit has passed all the final checkout procedures, it is
ready to be returned to the customer.

DESCRIPTION OF THE OTHER FUNCTIONS FOLLOWS;

Production Test

Command letter "Z". This function allows you to run through the series of test semi-
automatically by pressing the space bar. It will ask you the serial number of the unit
and print it out on a printer with the word PASS or FAIL.

Soot B

This function is not used at this time.

Examine

Command letter "E". This allows you to test a specified RAM location (address).

Adjust

Command letter "3". This is used to debug audio and serial port control lines (Motor
?.. £°"^^and) on the system console. A fixed frequency audio signal is produced
while PIA ports are exercised.

SUMMARY

This section has taken you step-by-step through aU the tests and general
troubleshooting steps required for evaluation of a suspect defective *00/800 console
Now read through the section, DISASSEMBLY and ASSEMBLY, before going on to
Section 5, Diagnostic Flowcharts, and Section 7, 800 Diagnostic Flowchart.

ATARI Home Computer 3-17

SECTION »
DISSASSEMBLLY/AS5EMBLY MAINTENANCE

ATARI WO HOME COMPUTER CONSOLE - DISASSEMBLY

The following describes the procedures required to disassemble the *00 Computer
Console. Read the following NOTES first, then proceed.

• • • NOTE • ♦ ♦

L Be very careful about mixing screws. Plastic and aluminum
parts can be easily stripped or damaged by puncture If the
wrong size screw is used.

Z. Excessive torque on screws can strip the plastic and aluminum

parts.

o Plastic - 6-inrh pounds torque maximum.

o Aluminum - 10-inch pounds torque maximum.

3. Protect the plastic surfaces of the console by working on a
soft surface (a grounding pad works very well) when the
Console is turned over, bottom up.

*. Use ALL static control precautions when handling any printed
circuit board.

KEYBOARD AND POWER SUPPLY ACCESS

To remove the top cover, perform the steps in the exact order given.

• Turn the unit side down.

• Remove four screws from the bottom cover (See Figure ^f-l).

ATARI Home Computer i^-1

BOTTOM COVER

Figure *-l. ATARI £*00 Console, Bottom Cover Screw Location

Turn unit upright.

Unhook top cover from keyboard (see Figure f-2).

Open cartridge door.

Lift top cover off.

ATARI Home Computer

^-2

TOP coven

Figure *-2. ATARI WO Console Top Cover Removal

KEYBOARD REMOVAL

To remove the keyboard, perform the following steps in the exact order given. Use
Figure ^3 as a reference for the following two steps,

• Remove single Iceyboard screw,

• Lift left end of keyboard and disconnect keyboard ribbon cable.

ATARI Home Computer

^^-3

Figure *-3, ATARI *00 Console, Keyboard Removal

POWER SUPPLY REMOVAL

To remove the power supply, perform the following steps in the exact order given.
Use Figure *-4 as a reference for the following four steps.

• Disconnect RF cable from power supply.

• Remove two screws from power supply.

• Gently pull power supply away from casting l/£f inch and lift out the
interlock switch plunger.

• Lift the power supply straight-up off the motherboard connector pins.

ATARI Home Computer

if_4

INTERU3CX PLUNGER

X INTERLOCX
/ SWITCH

POWEJ? SUPPLY

MOTHEH aOAPO
CONNECTOR

RF CASLS
Figure *-*. ATARI WQ Console, Power Supply Removal

ATARI Home Computer

£^-5

CPU, RAM, AND MOTHERBOARD ACCESS

To remove the module assembly, perform the steps in the exact order given. Use
Figure ^5 as a reference for the following two steps.

Disconnect and remove speaker assembly.
Lift module assembly out of the bottom cover.

CPU AND RAM REMOVAL

To remove the CPU and RAM printed circuit boards, perform the steps in the exact
order given. Use Figure *-5 as a reference for the following six steps.

Close and latch the cartridge door.
Set the module on its back-
Remove the eight screws from the bottom shield and lift off the shield.
Lift the motherboard assembly out of the aluminum casting.
Carefully unplug the CPU and/or RAM boards.
Unhook and remove the plastic cartridge guide.

ATARI Home Computer

if-6

CPU
aOARO

RAM

BOABD

suioe

SPEAKER
ASSCMSUr

AUIMINUM CASHNG

MOTHER aOARO

SCrrOM SHIELD

Figure ^-5. ATARI f^00 Console, Module Assembly

This concludes the disassembly of the WO computer console.

ATARI Home Computer

*-7

ATARI 800 HOME COMPUTER CONSOLE - DISASSEMBLY

The following describes the procedures required to disassemble the ATARI SOO Home
Computer console. Read the NOTES on pages ^t-l thru ^- 3 first, and then proceed.

ACCESS TO RAM BOARDS AND ROM BOARD

To gain access to the RAM and ROM boards, perform the steps in the exact order
given.

Remove the cartridge door assembly. Use Figure '^-6 as a reference for the following
eight steps.

• Turn the system power switch to the OFF position.

• Open the cartridge door.

• Turn the cartridge door clamps towards the outside of the Console.

• Lift the cartridge door assembly 1/* inch, pull it towards you, and lift it
off.

Remove the RAM and ROM modules.

• Lift out the RAM module<s),

• Lift out the ROM module.

• Lift out any cartridge<s).
Turn cartridge door clamps to original position.

•

ATARI Home Computer i^-8

CARTRIDGE DOOR
ASSEMBLY

Figure t^-6. ATARI 800 Console, Cartridge Door Assembly Removal

ACCESS TO POWER SUPPLY AND KEYBOARD ASSEMBLY

To gain access to the power supply and keyboard assembly, perform the following steps
in the exact order given.

REMOVE TOP COVER

Use Figure *-7 as reference for the following three steps.

• Turn unit upside down.

• Remove five screws from the bottom cover.

• Tilt the back of the bottom cover up and towards you to remove it.

ATARI Home Computer

^^-9

BOTTOM COVQI

Figure 4-7. ATARI 800 Console, Bottom Cover Removal

REMOVE THE PCB MODULE

Use Figure *-8 as a reference for the following seven steps.

Remove two screws from the aluminum casting flange.

Remove the single screw from the power supply board (lower left corner).

Disconnect speaker cable, remove speaker and set it aside.

Turn the unit over.

Carefully pull the back of the console top cover assembly to 90° separating
it from the PCB module.

ATARI Home Computer

if-10

Reach over the top cover and unplug the keyboard's ribbon cable.

Set the top cover assembly aside.

Lift the power supply board straight up.

Remove plastic cartridge guide by unhooking the latches from the bottom
side of the motherbcard-

MO0UU£ ASSCMBLT

KCYBOAin}

RiaaoNCAaL£

SPCAKER
HAHNESS

Figure ^^-3. ATARI 800 Console, Module Assembly Removal

REMOVE THE POWER SUPPLY

Use Figure *-9 as a reference for the following five steps.

• Unplug the RF cable from the power supply board.

• Unplug the power supply harness,

• Remove three screws from power supply board.

ATARI Home Computer

*-U

RF CABLE

POWER
SUPPLY

MOTHER BOARD
CONNECTOR

WIRE HARNESS

Figure *-9. ATARI 800 Console, Power Supply Removal

ACCESS TO CPU PRINTED CIRCUIT BOARD

Use Figure ^-10 as reference for the following four steps.

• Turn the unit upside down,

• Remove the nine screws from the lower shield,

• Lift the motherboard and lower shield out of the aluminum casting.

• Remove the CPU PCB.

ATARI Home Computer

if-12

ALUMINUM
CASniM

Figure *-lO. ATARI 800 Console, CPU Printed Circuit Board Removal

ACCESS TO MOTHERBOARD

Use Figure ^11 as reference for the following three steps.

• Carefully slide the tip of a screwdriver underneath the motherboard next
to the nylon clip. Gently raise the handle of the screwdriver, prying off
the nylon clip. Repeat this operation for the remaining three nylon clips.

» » * CAUTION • » ♦

Be care&l not to bend any of the pins on the Motherboard
Connector.

Do NOT allow the tip of the screwdriver to damage traces.

ATARI Home Computer

i*'{3

Lift the motherboard off the lower shield.

Remove the plastic cartridge guide by unhooking the four latches from the
bottom side of the motherboard.

cAimiooe suioe

aOTTQM SHIGLO

Figure ^-11. ATARI SOO Console, Motherboard Removal

KEYBOARD REMOVAL

Use Figure *-l2 as reference for the three steps, to remove the keyboard from its
case.

• Turn the top cover upside down.

• Remove four screws from the four corners of the keyboard.

• Lift the keyboard out of the top cover.

This concludes the disassembly of the Atari 800 Home Computer console.

ATARI Home Computer

i^-U

KEYBOARO

TOFCOVCR

Figure *• 12. ATARI 800 Console, Keyboard Removal

ATARI WO HOME COMPUTER CONSOLE ASSSEMBLY

The following outlines the steps required to reassemble the Atari t*-OQ Home Computer
console and it's related printed circuit boards.

MODULE ASSEMBLY REASSEMBLY

Refer to Figure i^-5 as reference for the following five steps.

• Snap the cartridge guide into the motherboard (it only goes in one way).

• Insert RAM and CPU printed circuit boards into the motherboard with the
component side of the PCBs facing away from you. Before reassembling
the PCBs, make certain that they have been cleaned and lubricated.
(Refer to pages *-21 and *-22 for instructions.) '

• Set aluminum casting upside down, invert the motherboard and gently
lower it into the casting.

Atari Home Computer

^^-15

• * • NOTE * * •
The CPU PCB must fit into the guides in the aluminum casting.

• Install lower shield and secure it with eight screws.

• Install the module assembly in the bottom cover.

KEYBOARD INSTALLATION

Refer to Figure 1-3 as a reference for the following three steps-

• Plug the speaker cable into the motherboard (no Polarity) and set the
speaker into the bottom cover.

• Plug the keyboard ribbon cable into the connector on the motherboard.

• Gently lower the keyboard over the Power-ON LED and guide posts on the
aluminum casting.

POWER SUPPLY INSTALLATION

Use Figure ^^-^ as reference for the following five steps.

• Align the power supply over the motherboard connector pins and bottom
cover guide posts and gently press it down.

• Install the interlock switch plunger into the aluminum casting. Make
certain that the lower end of the plunger is positioned over the interlock
switch and the plunger shaft rides in its notch in the power supply heat
sink.

• Insert and tighten the two power supply mounting screws.

* • * CAUTION • * *
Be sure that the RF cable is not trapped under the module assembly.

• Route the RF cable through its slot in the power supply board and plug it
into the power supply jack.

• Insert and tighten the single keyboard mounting screw.

Atari Home Computer ^-lS

TOP COVER INSTALLATION

Open the cartridge door.

Slide the top cover down over the open cartridge door and the power-ON
LED (Refer to Figure '^-2),

Guide the top cover locator pins into the keyboard holes and snap the top
cover hood under the keyboard-
Close the cartridge door and set the console on its face.

Align the top and bottom covers and Insert the four screws into the bottom
cover and tighten (Refer to Figure *-l).

ATARI 800 HOME COMPUTER CONSOLE ASSEMBLY

The following outlines the steps required to reassemble the Atari SOO Home Computer
Console and its related printed circuit boards.

KEYBOARD INSTALLATION

Refer to Figure '^-12 as reference for the following two steps.

• Set the top cover upside down with the keyboard in it,

• Insert and tighten the four mounting screws.

» * * NOTE * » •

Check the spacebar and keys to make sure that they are not binding
before proceeding.

MOTHERBOARD INSTALLATION

Refer to Figure '^-ll as reference for the following two steps,

• Snap the plastic cartridge guide into the top side of the motherboard.

• With the motherboard right side up, snap on the four nylon clips of the
lower shield. Make certain all four clips are firmly seated.

Atari Home Computer i^-17

CPU PCB INSTALLATION

Refer to Figure ^-10 as reference for the following five steps.

• Plug in CPU PCB, Make certain the component side of the board faces
away from the plastic cartridge guide and is firmly seated.

• Turn the aluminum casting over.

• Turn the motherboard upside down and set the motherhoard and lower
shield into the aluminum casting.

• • * CAUTION * • ♦

Make certain that the CPU PCB sets in its slot in the aluminum
casting.

• Insert and secure the nine screws in the lower shield.

• Set the console on its feet.

POWER SUPPLY INSTALLATION

Refer to Figure ^9 as reference for the following six steps.

• Carefully align the power supply connector with the motherboard pins.

• Set the power supply down over the guide pins on the aluminum casting and
gently press down.

• Attach strip connector between power supply and motherboard.

• Insert and tighten the three screws of the power supply board.

• Recommend the power supply harness.

* * * CAUTION • » »

Plug the power supply harness cable from the motherboard to the
power supply pins with the orange or purple wire towards the
aluminum casting.

• Plug the RF cable, the short end, into the power supply jack.

Atari Home Computer £^-18

MODULE ASSEMBLY INSTALLATION INTO TOP COVER

Refer to Figure ^^-8 as reference for the following six steps.

• Set the top cover upside down,

• Invert the module assembly and lower it into the top cover. Turn the
cartridge door latches toward the inside in order to clear the top cover.

• * * CAUTION * * •

Make certain that the RF cable is not trapped between the power
supply board and the top cover standoff (upper left screw hoie).

• Lift the motherboard one-inch out of the top cover and plug in the
keyboard hamess-

• Insert and tighten two screws into the front holes of- the aluminum casting
and into the top cover.

• Set the speaker into its receptacle foam side down. .
Connect the speaker cable to the jack (no polarity).

•

BOTTOM COVER INSTALLATION

Refer to Figure ^7 as reference for the following four steps.

Align the bottom cover with the four-hand-controller ports.

Seat bottom cover firmly, all the way around. Make certain the RF cable
exists through its hole and is not trapped between the covers.

Insert and tighten the five bottom cover screws-
Set the console right side up.

Atari Home Computer i^-lS

RAM AND ROM MODULE INSTALLATION

Refer to Figure *-6 as reference for the foliowing two steps.

• Insert the ROM Module in the slot closest to the keyboard.

• Insert a maximum of three RAM modules in the remaining slots.

CARTRIDGE DOOR ASSEMBLY

Refer to Figure '^7 as reference for the following two steps.

• Set the cartridge door assembly on the top cover and slide it to the rear of
the cover. This action engages the tab of the door into the aluminum
casting.

• Loci< the cartridge door assembly down with the two clamps next to the
program cartridge slots.

PCS CONTACT CLEANING AND LUBRICATION

The following instructions explain the procedures required to properly clean and
lubricate the PCB contacts of the CPU, RAM and ROM boards once they have been
removed from the motherboard.

Tools Required

ZEP Safety Solvent or Isopropyl Alcohol

Dust-Free Cloth

Acid Brush

Board Cleaning Brush

Libriplate (DS-ES Lubricant)
Procedures

1. Inspect the PCB contact for flux, dirt, foreign material, and deeply serated
contact fingers.

2. Moisten the dust-free cloth with solvent and clean the finger contacts.
Make sure both sides of the contacts are clean and free of residual
lubricant and contamination.

Atari Home Computer if-20

* ♦ * NOTE ♦ * *
Avoid touching the contact after cleaning.

3. If corrosion or residue remain on the contacts it is necessary to clean the
contacts further using the board cleaning brush. Use the following
procedures-

• Moisten the board cleaning brush with solvent and firmly brush the
contacts. Four to six strokes is enough. Be careful and do not touch
any other part of the board.

• Perform step 2 again.

*. Dip the acid brush into the lubricant.

5. Apply an even coating of lubricant to the contact fingers on both sides of
the PCB. The coating of lubricant should be thick enough to protect the
contact fingers from corrosion- Do not spread the lubricant to areas other
than the contact fingers.

VISUAL INSPECTION

The following instructions explain specific areas to check on the Consoles for damage
or abuse.

1. Inspect the controller jacks and peripheral jacks for broken and/or bent
pins.

2. Check the RF cable for cracks in the insulation, bare, or pinched areas.

3. With the console power ON and MEMO PAD on the screen, open the
cartridge door to check the interlock switch. Usinj^ a small blade
screwdriver, press the plunger down. Release the plunger and see that it Is
returns to its open position. In its open position the console is powered-
down.

^. Inspect the cartridge slot for foreign objects or damage.

5. Inspect the power jack for bent and/or damaged pins.

If any of the above damage is found, repair the defective area. Use the disassembly
and assembly instructions at the beginning of this section.

Atari Home Computer i^-21

SECTION 5
WO DIAGNOSTIC FLOWCHART

The Diagnostic Flowchart is intended to be easy to use and the primary aid when
troubleshooting the ATARI WO Computer Console. Follow the prompts in the order
presented. When a question is asked, follow the line from that box which best applies
to the unit's situation. The flowchart leaves little to chance, it tells you when to
perform a specific test and when to replace components.

Swap Out Procedure

At many places in the diagnostic flowchart, a box tells you to "swap-out" a chip or a
number of chips in a particular order. The "swap-out" instruction means that you
should replace the indicated components (one at a time) with a known good component
of the same type. The 400 should then be tested with the new, known-good component
in place to see whether the "swap-out" solved the problem being checked. If the swap-
out did not fix the problem, the known-good component should be removed, and the
original component reinserted. In this way, you avoid needlessly replacing good
components.

CAUTION:

Extreme care shouid be taken when handling the integrated circuit, chips. They are all
v«3r sensitive to static electricity and can easily be damaged by careless handling.
Always keep the chips in their plastic carrier tubes or on conductive foam when not
handling them. Make certain you are well grounded when handling the chips. Atari
strongly recommends that you wear a conductive grounding band (which ties from yow
arm to ground) when handling the chips.

Thediijw are also susceptible to damage from stress when being removed from or
inserted into the sockets. Always use a chip-puUer when removing the chips. Do not
pry the chip out with a screwdriver or any other tool.

Failure to follow the above guidlines results in unusally high chip failure rates and
extra expense.

ATARI Home Computer 5-1

400 POWER-UP
CATASTROPHIC FAILURES AND BASIC OPERATIONS

Remove any Carcrldpe
and Power-up Console

Is a clear

MEMO PAD

YES

teat special graphics
mode of keyboard
using Figure 3-1

YES

Co to START,
next pave

Pass

Go to POWER-UP,
PART II, Page 5-8

N'oce failures t co be

used lacer with

keyboard cesc

ATARI Home Computer

5-2

400 FOWER-UP
CATASTROPHIC FAILURES AND BASIC OPERATIONS
SNOWY SCREEN

Is tha scre«n snowy

YES

Go to Slack/ Gray
Screen, Page 5-4

Check, adjust, or

replace AC power

aciaptor, channel

select switch and

TV switch box

Is a clear MEMO PAD
on the screen

Does Power Supply

Board. J201. Pins 3.

6, and 7, have +5v

YES'

NO I Is there a good
ground connection at
Pin 1 of RF Module

Repair

YES,

Is a clear MEMO PAD
on the screen

YES

Go to POWER-UP,
PART II. Pa^e 5-8

YES

Is the RF Module
mistuned or defective

Go to Black/ Gray
Screen. Page 5-4

YES I Go to POWER-UP:

PART II, Page 5-8

Check . repair . or
replace the following:

CR206-CR209. replace

IN4001 type diodes

with IN5391 (C017988)

Does voltage reg-
ulator (A202) have
+5v

Check C208. C209,
R203, and S202 -
replace if defective

Is a clear MEMO PAD
on the screen

YES

ATARI Home Computer

5-3

400 POWER-UP
CATASTROPHIC FAILURES AND BASIC OPERATIONS
BLACK/GREY SCREEN

Is the screen black
or gray

lYES

Check Power Supply
Board for:

Is there -5v on J201
Pin 18

iGo to GREEN /YELLO
I SCREEN, Page 5-^

YES

Check, repair, or
replace the following:

CR206 - CR209 -

replace 1N400I type

diodes with 1N5391

(C017988)

CR201 - Ca203, and
C2ai, C202. and C210

Is there >I2v an
J201. Pin 2

NOTE 1

See Table 5-1, start
at the top of it and

trace back until clock

signal appears,

indicating which

component has failed.

YES

Check . repair , or
replace the following;

Voltage Regulator

(A20I), CR204 and

C203 - C205

Check the CPU
Board for:

'' Clock Circuit (see

NOTE I)

Chip Reset Voltages:

Is there +5v on

A302, Pin 36 and

A303, Pin 30

Repair

YES

Replace CTIA/GTIA
(A301)

Is a clear MEMO PAD
on- the screen

YES

Go to POWER-UF.
PART II. Page 5-8

Go to C, next page

ATARI Home Computer

5-4

400 POWER-UP
CATASTROPHIC FAILURES AND BASIC OPSaATIONS
3LACK/GREY SCREEN { cont )

On the Mother-
board

Swap-out A103. Alll

2103 - ZX05. QIQ3,

Q104. and XlOl

Is a clear MEMO PAD
on the screen

Check and replace

discrete components

In video summing

circuitry

Is a clear MEMO PAD
on the screen

YES

Go to POWER-UP,
PART II, Page 5-8

YES

Go to POWER-UP,
PART II. Page S-a

Go to GREEN/YE14.0W
SCREEN. Page 5-6 !

ATARI Home Computer

5-5

400 POWE-?.-U?
CATASTROPHIC FAILURES AiVD 3A5IC OPERATIONS
GREEN /YELLOW dCREEN

Is there

a defective

YES

Repair

RAM card in the
Unit (check lowest
RAM slot arst)

YES

Swap-out ROMs

F(A103), E(A104),

and D(Aia5}

Is a clear MEMO PAD
on the screen

Go to POWER-UP,
PART II. Page 5-8

YES

Swap-out the

following A303.

and Z303, and Z3a4

Is a clear MEMO PAD
on the screen -

Go to POWER-UP,
PART II. Page 5-8

Go to SOUD BLUE
SCREEN. Page 5-7

ATARI Home Computer

5-6

400 POWER-UP
CATASTROPHIC FAILURES AND BASIC OPERATIONS
SOLID BLUE SCREEN

Are the words -

YES

Go to POWER-UP,
PART II. Page 5-8

MEMO PAD on the
screen

/"^

[DO)

■

Swap-out the POKEY
(AlOl) chip

Is the screen strictly
BUck and Vbita

YES

Swap-out 0X07 and
XIOl on Mocherbaord

Is a clear MEMO PAD
on the screen

Call ATARI Tech Line j

Specialist 1

YES

Inside California
(800) 672-1466

Outside California i

Go to POWER-UP,
PART II Pase 5-8

(800) 538-1535 I
(800) 538-1536 !

ATARI Home Computer

5-7

400 POWER-UP. PART 11

<3tarO

Turn power OFF,

Insart SALT II

Cartridge, and turn

power ON

RAM:

Do«9 screen look

like Figure 3-2

See NOTE 2

YES

la there ^40 color or
are the coiors off

YES

Go to COLOR
BAR Teat, P»ge 5-9

Is the screen solid

green, yeilow, or

red

YES

Reeat SALT II

Cartridg* and reteat

Does screen look
like Figure 3-1

Repeat POWER-UP^— *"
PART I, Page 5-2

YES

NOTE 2

could be 3K. 16K.
24K, 32K. oe 40K

TIA: couid be NTSC or PAL

ROM: could be -

MATH:NTSA:NTSA

MATH:NTSa:NTSB

MATH:PALA:PALA

' MATH:PALS:PALB

ERR: ia displayed for any

bad ROM, verify error

condition via VERIFY
aCM Teat, Page 5-

Go to COLOR
BAR Teat. Page5-9l

ATARI Home Computer

5-8

COLOR BARS

Preaa C and
RETURN

Oo*a screen look
like Figure 3-4

Can you adjust R309
to the proper color

YES

Adjust R3Q9

Does screen look
like Figure 3-4

Go to COLOR BAR

TROUBLESHOOTING,

Page 5-lQ

Does MENU appear NO
i (Refer Figure 3-3) j

@ YES

YES

Repeat POWER-UP,
Page 5-2

Go to TIA, Page5-10

Go to COLOR BAR
TROUBLESHOOTING .

Page 5 -10

Go to TIA. Page 5-10

ATARI Home Computer

5-9

400 COLOR BAR
TROUBLESHOOTING

STAR

Swap-out A301 and
A302. on CPU Board

Oo«9 screen look
like Figure 3-4

Swap CPU Board

Does screen look
Uke Figure 3-1

Swap-out Alll, Q107
on Motherboard

Does screen look
like Figure 3-4

YES

Go to TIA, Page 5-13

YES

Trace color circuitry

on CPU Board.
Make cetain to check
color delay circuit
and R3Q9

YES

Go to TIA. Page 5-13

Go Co next page

ATARI Home Computer

5-10

400 COLOR BAR
TROUBLESHOOTING (cont)

Verify that each o£ tfaa foUowing levels and/or
signal wave forms exist before procee<iing to
the next step. Use SALT 11, COLOR BARS.
locked into the continuous mode.

Is there 3.58MH2
oscillation at R1S8
on Motherboard.
Refer Figure

YES

Is there input
signal to base of
Q107 Refer Figure

YES

Is there output
signal from collector
on Q107 Refer
Figure ,

YES

Swap-out XlOl. Q103
and 0104

Trace circuit back to
previous step

Trace circuit back
previous step

Is there signal at
J107. Pin 1 Refer
Figure

Trace circuit back to
previous step

YES

Go to next page

ATARI Home Computer

5-U

400 COLOR BAR
TROUBLESHOOTING (cont)

Are the following

present Refer
Figure

-•^v on Modulator
Pin 5

Signal on Modulator
Pin 4

Signal on Modulator

Pin 2

YES

Does screen look
like Figure 3-6

Trace circuit back to
previous step

JSS.

Go to TIA, Page
5- 18

Call ATARI Tech Une
Specialist

Inside California
(800) 672-1466

Outside California

(800) 538-1535
(800) 335-1536

ATARI Home Computer

5-12

TIA TEST

CSTART^

YES

Press I and
RETURN

Da«s NOT GTIA
appear on screen

Go to GRAY BAR |

YES

rest, Page5-14

Is there a color

rainbow on the

screen

Go to GRAY BAR
Test, Page 5-14

Replace GTIA (A301}
on CPU Board

ATARI Home Computer

5-13

400 GREY BAR

YES
YES
YES

Press G and
RETURN

Does screen look
like Figxire 3-6

Replace CTIA/GTIA
(A301)

Does screen look
like Fiaure 3-6

Replace Alll

Does screen look
like Figure 3-6

Co to ANY VIDEO,
Page 5-18

Go to 400 GREY BAR

TRCUBLESHOOTING,

Paste 5-15

ATARI Home Computer

5-iif

400 GREY BAR
TROUBLESHOOTING

Swap-out A301 and
A302. on CPU Board

YES

Doas screvn look
like FIgun 3-6

Go to ANY VIDEO,
Page 5-18

YES

Swap CPU Board

Ooos 9cr««n look
Uk« Figure 3-6

Trace color circuitry

on CPU Board.
Make cetain to check
color delay circuit
and R309

YES

Swap-out Alll. Q107
on Motherboard

Does screen look
like Figure 3-6

Go to ANY VIDEO,
Paye 5-18

Go to next page

ATARI Home Computer

5-15

400 GREY BAR
TROUBLESHOOTING (cont)

Verify that each of the foUowing levels and/or
signal wave foras exist before proceeding to
the next step. Use SALT II. COLOR BARS,
locked into the continuous mode.

Is there 3.S8MHz
oeciUation at R158
on 'Motherboard.
Refer Figure

■iiamia

Swap-out XlOl. Q103
and QI04

YES

Is there input

signal to base of

Q107 Refer Figure

Trace circuit back to
previous step

YES

Is there output
signal from coilectot
on QIO? Refer
Figure

Trace circuit back to
previous step

YES

Is there signal at
J107, Pin 1 Refer
Figure

Trace circuit back to
previous step

YES

Go to next page

ATARI Home Computer

5-16

400 GREY BAR
TROUBLESHOOTING (cont)

Ar« tha foUowtng
presant Glefer

*5v on Modulator
Pin S

Signal on Modulator
Pin 4

Signal on Modulator
Pin 2

YES

Ooaa scraan look
Uka Figura 3-6

NO I Trace circuit back to
" pravious step

JCSS.

Go to ANY VIDEO,
Paga 5-18

Call ATARI Tech Line
Specialist

Inside California
(800) 672-1466

Outside California
(800) 538-153S
(800) 538-1536

ATARI Home Computer

5-17

400 ANY VIDEO

Press A and
RETURN

Does scrsttn look
like Figura 3-5

Replace ANTIC

(A302) on CPU

Board

Does screen look
like Figure 3-5

RepUce CTIA/GTIA
(A301)

Does screen look
like Figure 3-5

JZS.

YES

XZ2.

Go to KEYBOARD
Test, Page 5-22!

Go to 400 ANY VIDEO

TROUBLESHOOTING.

Page 5-19

ATARI Home Computer

5-18

400 ANY VIDEO
TROUBLESHOOTING

TAH:

Swsp-^ut A301 and
A302. oa CPU Boarti

YES

Ooma scre«n look
Uka Figure 3-5

Go to KEYBOARD.
Page 5-22

YES

Swap CPU Board

Do«a aervan look
Uka Figure 3-6

Trace color circuitry

oa CPU Board.
Make cetain to cheek
color delay circuit
and a309

YES

Swap-out Alll. Q107
on Motherboard

Oo«9 screan look

Go to KEYBOARD,

Page 5-22

Uka F

gure 3-5

Co to next page

ATARI Home Computer

5-19

400 ANY VIDEO
TaoUBLESHQOTING (contl

Verify that each of the following levels and/or
signal wave forms exist before proceeding to
the ne« step. Use SAX-T II, COLOR BARS.
locked into the continuous mode.

Is there 3.58MHz
osciXIation at R15S
on Mother boaz4.
Refer figure

YES

Is there input

signal to base of

gi07 Refer FLgur«

YES

la there output
signal from coUectoi
on QIQ7 Refer
Figure

YES

Swap-out XlOl. Q103
and QI04

Trace circuit back to
previous step

Is there signal at
J107. Pin 1 Refer
Figure

Trace circuit back to
previous step

YES

Go to next page

ATARI Home Computer

5-20

400 ANY VIDEO
TROUBLESHOOTING (contl

Ar« the foUowing

present nefer
Figure

Hv on Modulator

Pin S

Signal on Modulator
Pin 4

Signal on Modulator
Pin Z

YES

Does screen look
like Figure 3-S

Trace circuit back to
previous step

J£^

Go to KEYBOARD,
Page 5-22

CaU ATARI Tech Line
Specialist

Inside California
(800) 672-1466

Outside California
(800) 538-1535
(800) 538-1536

ATARI Home Computer

5-21

KEYBOARD

.STAR

Press K and
RETURN

Do keyboard test

YFS

PASS

YKS

Did same keys fail as
in PGWER-UP, PART I

ALL

YES

Was it all or just some
of the kevs

SOME

Replace keyboard

PASS

(

LL)

Swap-out AlOl, 2103.
and Z104

Go to TONE TEST.L^
Page 5-24 ]

.XJi^

PASS

Go to next page

ATARI Home Computer

5-22

KEYBOARD (contl

Troubleshoot . using
foilowing information
and Keyboard
achematic. Page 5-3$

TYPICAL KEYBOARD
OUTPUT

Sample oaade from
Z104, Pin U '^th
W key depressed.

SCOPE:

rTT/DIV,.5oiS/DIV
SYNC ;

CHI, ♦ Trigger

ltJ

TYPICAL DECODER

OUTPUT

Sampie made from
Z104. Pin 3 with
W key depressed

SCOPE ;

TTV/DIV, .2mS/DIV
SYNC ;

CHI, * Trigger

Pass

JCSS.

Go to TONE TEST,
Page 5-24

CaU ATARI Tech Une
Specialist

Inside California
(800) 672-1466

Outside California
(800) 538-1535
(800) 538-1536

ATARI Home Computer

5-23

400 TONE TEST

MM]

Entsr voice number

to he tested (1-4)

and Preaa RETURN

Test remaining
three voices

YES

Did you hear lU
eight tones or
speaker elicits*

PASS

iUl.

YES

^The first t«o tones are very
■— — high in frequency: thus.

they otay be inaudible to some
ears. The TV speaker clicks
from the OC level shifts can
be heard for each tone.

Replace POKEY
(AlOl) and retest

Go to CONSOLE

SWITCH TEST.

Page 5-28

PASS

:££s.

Go to START,
this page

Lock SALT II into
CONTINUOUS MODE,

restart test on
VOICE I, and scope
Pin 37 (AUD) of AlOl

Go to next page

ATARI Home Computer

5-2i^

400 TONE TEST (cont)

la there a frequency
shift as the frequency

of the tone lowers

and amplitude decays

to Ov

SCOPE ;

TTT/Div, .5mS/0iv
SYNCj

+ CHI

YES

Presa J and

RETURN

Is the screen black
with no sound

YES

P^'ess SPACE BAR

Did you hear a
single teat tone

This re-runs the first

two steps of this

teat

Go to 0, next page

YES

Press SYSTEM

RESET, T. RETURN,
1. and RETURN

PASS

YES

Go to CONSOLE
SWITCH TEST,
Page 5-28

CaU ATARI Tech Line-
Specialist I

Inside California |
(800) 672-1466

Outside California
(800) 53a-1535
(800) 538-1536

ATARI Home Computer

5-25

Are C164 (.luf).

C179 (.luf). R161

(ISK) or R166 (6.8K}

open

YES

400 TONE TEST (cont)

Repair and retest

YES

Repair and retest

Are C184 (.OOIuf) or

R170 (4.7K) shorted

or open

.xss.

Repair and reteet

Can you verify the
following :

1) 4.SMHZ osciUation

by connecting a

scope to the emitter

of Q105

2) A sine wave ^ Z.l

centimetera 9

.lua/Dlv and

20mV/Dlv which

equals s 4. 3MHz

3) Can you adjust LlOl

to equal 4.SMHz

YES

Verify input to Audio
Mixer by connecting

scope ( .SmS/Div,

5mV/Div) to collector

of Q106

Are wavefoma
same as AlOl. Pin
37 (except wave-
form is rounded, not
square)

Repair and retest

Return to START,
Page 5-24

YES

Is there output on

LX18 (use scope

(.5mS/Div,50mV/Div)

Replace Q106 and
retest

YES
Go to next page I

ATARI Home Computer

5-26

400 TONE TEST (cont)

Adjust A203 to Ch3.
verify TV is tuned
to Ch3 and fine
tuning is adjusted to
a elesr picture and
turn the volume up

Retest

PASS

iia

YES

Re-ma remainder of

tone test for other

three voices

CaU ATARI Tech Line
Specialist

Inside California
(800) 672-1466

Outaide California
(800) 538-1535
(800) 538-1536

PASS

YES

Go to CONSOLE
SWITCH TEST.
Page 5-28

ATARI Home Computer

5-27

400 CONSOLE SWITCH TEST

START

Press S and
RETURN

YES

?ress aach (4)
Console Switch

PASS

Go to ROM Test,
Page 5-29

,mi;

Does console speaker

"SEEP" when any

Console Switch is

pressed

Are ail9 - R122 or

CI21 - 124 shorted

or open

YES

Replace and retest

YES

Replace CTIA/GTIA

(A301) on CPU

3oard and retest

PASS

Go to ROM Test,
Page 5-29

YES

■

Did a single
switch fail

Call ATARI Tech Line
Specialist

Inside California
(800) 672-U66

Outside California
(800) 538-1535
(800) 538-1536

ATARI Home Computer

5-28

400 VERIFY ROM

Press V and

RETURN

PASS

Verify ROM Teat is
locked into CONTIN-
UOUS MODE and
is displaying esch
ROM checksum and
the word PASS or
FAIL

Press D and RETURN
Press E and RETURN
Press C and RETURN
Press V and RETURN

QO)-

Did ROM E faU

Did ROM F fail

□ id all ROMs faU

I Swap-out Z401 - 2403

Go to next page

YES

Did ROM D fail i YES

YES

Go to RAM Test,
Page 5-31

Replace A402 and
retest

Replace A403 and
rettit

Replace A401 and
t retest

YES

Replace A401 - A403
and retest

ATARI Home Computer

5-29

400 VERIFY ROM (cont)

PASS

YES

Go to RAM Test,
Page 5-31

YES

l9 02 clock prttsent
at Pin 10 of Z403

Trace 02

(Refer CPU Board

on Page 5-10 ) ,

and retest

PASS

YES

Go to RAM Test,
Page 5-31

Call ATARI Tech Une
Specialist

Inside California
C800) 672-1466

Outside California
(800) 538-1535
(800) 538-1536

ATARI Home Computer

5-30

400 RAM

Press R and
RETURN

Enter the amount

at RAM to be tested

(Refer Page 3-12 )

PASS

YES

Press SYSTEM RE5ET

The SALT II MENU is

returned to the

screen - it tells

you how much RAM

is resident.

YES

Did you select

nwre RAM to test

than is resident in

the console

UFJ

Ga to RAM START

Press and RETURN
Press E and RETURN
Press C and RETURN
Press R and RETURN

RAM TEST MATRIX

is returned to the

screen ( See Figure

5-2 and use the

LEGEND provided in

Table 5-t to decode

failure )

Repair components

and retest

Go to next page

Go to PORT Test,
Page 5-33

ATARI Home Computer

5-31

400 RAM (cont)

PASS

YES

Go to PORT Test,
Page 5-33

Cail ATARI Tech Line
Specialist

Inside California
(800) 672-1466

Outside Caafomia
(800) 538-1535
(800) 538-1536

ATARI Home Computer

5-32

400 PORT

Press P and
RETURN

Install Hand
Controller Jack teat

connector and
Peripheral PORT test
connector

Press RETURN

PASS

YES

Bum -in Console for

minimum of eight

hours

Reseat Test

connectors and

retest

PASS

YES

Use Table 5-2 to
dec .-it error matrix,

:place and repair
defective components
and retest

Go to next page

ATARI Home Computer

5-33

400 PORT (cont)

PASS

YES

Burn-in Console for

minimum of eight

hours

Call ATARI Tech Line
Specialist

Inside California
(800) 672-1466

Outside California
(800) 538-1535
(800) 538-1536

ATARI Home Computer

5-3^

THIS PAGE INTENTIONALLY LEFT BLANK

ATARI Home Computer 5-35

Table 5-1

CLOCK CIRCUIT

PIN NUMBER

BOARD
CPU

FREQUENCY
1-789

SCOPE CHART #

21 of

JlOl

22 of

JlOl

CPU

1.739

3 of

Z302

CPU

1,789

9 of

Z302

CPU

1.789

10 of

Z302

CPU

1.789

13 of

2302

CPU

1.789

37 of

A303

CPU

1.140

6 of

Z301

CPU

1.789

34 of

A302

CPU

1.789

35 of

A302

CPU

3.579

29 of

A301

CPU

3.579

23 of

A301

CPU

3-579

Collector of

Q102

300

Main Board

3.579

Collector of

Q104

400

Main Board

3.579

7 of

AlOl

400/300 Main

Boaard

1.789

25 of

A102

400/300 Main

Board

1,789

* Use Scope Waveform Legend on next page to see
illustration of waveform.

ATARI Home Computer

5-36

Scop« Havvforn i luS/DIV IV/DIV

Scop* W«v«fora 3 Xufl/DIV IV/Biv

X .< i( A A

u U

Scop« Havvfora 2 lufl/DIV IV/DIV

Scop« Mav«fomi 5 luS/DIV IV/DIV

Scopa Mavaform s lua/Dlv IV/nxv

Scope Waveform Leqend
ATARI Home Computer 5-37

Keyboard

Connection
Chart

PIN CONNECTOR
NUMBERS NUMBERS

400/Z102 40Q/J105
300/Z103 8Q0/J106

-15

-7

-22

-30

-44

-23

-SO

— 9

-24

-21

1-37

-36

AlOl

— 6

-5

-20

-38

-35

.51

h49

•10

-L

— 4

•23

J-

-2S
1_

-39

-34

-52

-4a

-11
J-

-12

-3

-27

-19

-40

-33

-53

-47

-la

-41

-32

-54

-46

J-

-13 M4

-I L-

-28

-29

•17

-42

-31

-55

-45

-16

-43

CONNECTOR
NUMBERS

400/J103
800/J106

400/21 01

aoo/zi04

PIN
NUMBERS

Legend

ESC

13. anuc

29.

ssnon

43.

CAPS
LOWa

I
1

i< CU SCI

30.

C8ZL

44.

SHIFT

17. q

31.

45.

13. H

32.

46.

9
4

19, E

33.

47.

20. B

34.

4a.

21. T

33.

49.

/
7

22. f

36.

50.

23. U

37.

51.

10,

(
9

24. I

33.

52.

•

)

25.

39.

53.

3 ■■■

12.

26. P

40.

1
1

54.

13.

IHSERT

27. f,-

41,

55.

/l\

14.

DKLEJZ
BACK S

23, * , >

42.

* j

36.

SHIFT

57 . SPACE

BAS

ATARI Home Computer

5-38

ERROR
COUNTER

TEST
COUNTER

0«l«ciiv« RAM Bevds

0«tec^«« RAM Idantifiar

0«f«ct

[ndicatar

B3|or
a««nd B3

B4 and B«

B9 and B6|
or

B4, B3 and
B«

37; or
54 and B7

OMcription

tnSKBkxdt

2nd SK Block

3rd SK Block

4tn SK Block

3th SK Block

DiM«r«nc«

Colunm

DMcriptton

16K

zsn

Ut2

Z9U

Z31t

Z310

ZJQI

Z309

D«

Z309

Z30S

Z307

2303

ZJOi

Z306

Z303

ATARI Home Computer

Figure and Table 5-2
5-39

Table 5-3

Port Teat Legend

A
B
C

D
£
F

G
M

7654 3210

ATARI Home Computer

5-i^O

SECTION 6

SYMPTOM CHECKLIST

The Symptom Checklist is designed to assist the experience technician arrive at a
rapid diagnosis for problems. The checklist is not intended to replace the Diagnostic
Flowchart as the primary troubleshooting guide, but rather, to supplement the
flowchart.

Each symptom is accompanied by some possible causes and the best point to enter the
Diagnostic Flowchart to locate the problem.

Symptom

Possible Cause

Diagram Entry Point

Snowy Screen

Black/Gray Screen

Green/Yeilow Screen

Solid Blue Screen

No Color or Bad Color

Bars with SALT 11

No Color Bars on TIA Test

SW Box, AC Adaptor
CH. Select SW, Modulator
Adjustment, RF Cable
Damage

Verify -t-SV, -*V & +12V
Power Supplies, CR20 1-209,
C201-205, C210, A201, A302,
A303, A301, A103, Alll,
Z103-Z105, Q103-4, XlOl

2103-5, A03, Z303 & *
all on ROM Board

A101,Q107, XlOl

R309 Adjust, A301-2on
CPU Board; Alll, Ql 07
on Mainboard, XlOl,
Q103, QIO*

Modulator Adjustment

A301 on CPU Board

AA
400, Page 5-3
SOO, Page 7-3

BB
400, Page 5-4
800, Page 7-4

CC
400, Page 5-6
800, Page 7-6

DD
400, Page 5-7
800, Page 7-7

E£
400, Page 5-9
800, Page 7-9

FF
400, Page 5-12
800, Page 7-12

GG
400, Page 5-12
800, Page 7-12

ATARI Home Computer

6-1

Symptom

Possible Cause

Diagram Entry Point

No Gray Bars

Upside Down Alpha/
Numerics or Player Field

Some Keyboard Keys Faii

AU Keyboard Keys Faii

Tones Missing During
Sound or Games

Console (Game) Switches
Will Not Function

ROM Test Failed

RAM Test Failed

Hand Controllers
Will Not Work

A301, Alll, Q107
R309 Adjustment
X101,Q103 & if
Modulator

A302 on CPU Board, A301
AU1,Q107

Modulator

Keyboard Failure

AlOl, Zl03ac*

AlOi, R160, R161, R166, R170
C164, C179, CIS*, Q105
LlOl, Q106, L118, A203

A301 on CPU Board, RU9-122
C^21-12i^

AW I -403 on ROM Board
1*03

See RAM test
Matrix, Figure 5
Table 5

See Port Test
Matrix, Table 5

HH
*00, Page 5-U
800, Page 7-1*

*00, Page 5-1
800, Page 7-1 *

13
*00, Page 5-21
800, Page 7-21

*00, Page 5-22
800, Page 7-22

LL
*00, Page 5-22
800, Page 7-22

MM
*00, Page 5-2*
800, Page 7-2*

NN
*00, Page 5-28
800, Page 7-28

OO
*00, Page 5-29
800, Page 7-29

PP
*00, Page 5-31
800, Page 7-31

QQ
*00, Page 5-33
800, Page 7-33

ATARI Home Computer

6-2

SECTION 7
800 DIAGNOSTIC FLOWCHART

The Diagnostic Flowchart is intended to be easy to use and the primary aid when
troubleshooting the ATARI 800 Computer Console. Follow the prompts in the order
presented. When a question is asked, follow the line from that box which best applies
to the unit's situation. The flowchart leaves little to chance, it tells you when to
perform a specific test and when to replace components.

Swap Out Procedure

At many places in the diagnostic flowchart, a box tells you to "swap-out" a chip or a
number of chips in a particular order. The "swap-out" instruction means that you
should replace the indicated components (one at a time) with a known good component
of the same type. The 800 should then be tested with the new, known-good component
in place to see whether the "swap-out" solved the problem being checked. If the swap-
out did not fix the problem, the known-good component should be removed, and the
original component reinserted. In this way, you avoid needlessly replacing good
components- °

CAUTION:

Extreme care should be taken when handling the integrated circuit chips. They are all
v«r]t sensitive to static electricity and can easily be damaged by careless handling.
Al2s^ keep the chips in their plastic carrier tubes or on conductive foam when not
handling them. Make certain you are well grounded when handling the chips. Atari
strongly recommends that you wear a conductive grounding band (which ties from your
arm to ground) when handling the chips.

The chips are also susceptible to damage from stress when being removed from or
inserted into the sockets. Always use a chip-puller when removing the chips. Do not
pry the chip out with a screwdriver or any other tooL

Failure to follow the above guidelines results in unusally high chip faUure rates and
extra expense-

ATARI Home Computer 7-1

800 POWER-UP
CATASTROPHIC FAILURES AND BASIC OPERATIONS

START

Remove any Cartridge
and Power-up Console

YES

Is a cieu- MEMO PAD
on the screen

YES

Tesc special graphics

mode of keyboard

using Figure 3-1

Go to START,
next page

Pass

Go to POWER-UP,
PART II. Pane 7-8

Note failures t co be

keM

'board cast:

ATARI Home Computer

7-2

800 POWER-UP
CATASTROPHIC FAILURES AND SASIC OPERATIONS
SNOWY SCREEN

Is ths screen snowy

YES

Go to BLACK/GREY
SCREEN, Page, 7-4

Repair

Ji£S_

Is a clear MEMO PAD
on the screen

YES

Go to POWER-UP,
PART II, Page 7-8

Check, adjust, or

replace AC power

adaptor , channel

select switch and

TV switch box

la a clear MEMO PAD
on the screen

Doee Power Supply

Board. J201. Pin 17.

have *5v

YES

Is there a good

ground connection at

Pin I of RF Module

YES

Is the RF Module
mistuned or defective

YES

Go to Slack/Gray
Screen, Page 7-4

Go to POWER-UP,
PART IX, Page 7-8

Check, repair, or
replace the following:

CR206-CR209. replace

1N4001 type diodes

with 1N5391 CC0I7988)

Does voltage reg-
ulator (A20Z) have

t-Sv

Check C208, C209,
R203, and S202 -
replace if defective

Is a

clear MEMO
in the screen

PAD

prns

Return to START
this page

ATARI Home Computer

7-3

800 POWER-UP

CATASTROPHIC FAILURES AND BASIC OPERATIONS
BLACK/GREY SCREEN

Is the screen black
or gray

YES

Go to GREEN /YEUXW
SCREEN. Page 7-6

MOTE I

See Table 7 -1 . start

at the top of it and

trace back until clock

signal appears,

indicating which

component has failed.

Check Power Supply-
Board for:

Is there 'Sv on J201
Pin 1

YES

Is there ■•■I2v on
J201, Pin 21

YES

Check the CPU
Board for:

Clock Circuit (see
NOTE 1)

Chip Reset Voltages:

Is there ■♦^v on

A302. Pin 36 and

A303. Pin 40

YES

Replace CTIA/GTIA
{A301)

Check, repair, or
replace the following;

Voltage Regulator

CR204 and CR205

Replace 1N4001 type

diodes with 1N539I

(C017988)

Check C203 - C205.
and C212

Check, repair, or
replace the following:

Voltage Regulator

(A201). CR204 and

C203 - C205

Repair

Is a clear MEMO PAp l YES
on the screen P"^

Go to POWER-UP,
PART II, Paffe 7-8

Go to C, next

page

ATARI Home Computer

7-4

SCO pcwsa-up

CATASTRO PHIC FAILURES AND BASIC QPEaATIQWS
3LACK/GREY SCREEN (cont)

On tha Mother-
board

Swap-out Clock
Circuit components,
ZlOl - Z104, and
OS Board ROM F by
substitution

Is a clear MEMO PAD
on the screen

YES

Go to POWER-UP.
PART n. Page 7-8

Go to GREEN/YELLOW
SCREEN, Page 7-6

ATARI Home Computer

7-^

300 POWER-UP
CATASTROPHIC FAILURES AND BASIC QPERATIONC
GREEN /YELLOW SCREEN

Is there

a defective

YES

Repair

RAM card tn the
Unit (check lowest
RAM slot first)

Swap-out ROMs

A40I - A403
on Personality
Board

Is a clear MEMO PAD
on the screen

YES

Go to POWER-UP,
PART II, Page 7-8

Swap-out the

following A303 ,

and Z303. and 2304

Is a clear MEMO PAI

1 YES

Go to POWER-UP.

on the screen

PART II. Page 7-8

Go to SOLID BLUE
SCREEN. Page 7-7

ATARI Home Computer

7-6

800 POWER-UP
CATASTROPHIC FAILURES AND BASIC OPERATIONS
SOLID BLUE SCREEN

START

Are the words -
MEMO PAD on the
screen

YES

Go to POWER-UP
PART II. Page 7-8

Swap-out the POKEY
(AlQl) chip

Is the screen strictly
Slack and White

YES

Swap-out A104 and
XlOl on Motherbaord

Is a clear MEMO PAD i NO
on ^he screen I

YES

Go to POWER-UP,
PART II, Page 7-8

CaU ATARI Tech Une
Specialist

In.-i-ie California
(800) 672-1466

Outside CalifomiA
(800) 538-1535
(800) 335-1536

ATARI Home Computer

1-1

800 POWER-UP, PART II

Turn pow«r OFF,

Insert SALT n

Cartridge, and turn

power ON

Does screen look

lilce Figure 3-2

See NOTE 2

YES

Is there NO color or
are the colors off

YES

Co to COLOR
BAR Test. Page 7-9

NOTE 2

RAM: could be 3K, 16K,
24K, 32K. oe 40K

TIA: could be NTSC or PAL

ROM: could be -

MATH:NTSA:NTSA
MATH:NTSB:NTSB
MATH:PALA:PALA
MATH:PALfl:PALB

ERR: is displayed for any

bad ROM, verify error
condition via VERIFY
ROM. Page 7-

Is the screen solid
green , yellow , or

. red

YES

Reseat SALT II
Cartridge and retest

Does screen look
like Figure 3-2

YES

Repeat ?OWER-UP,
PART I. Pace 7-2

Go to COLOR I
BAR Test. Page 7-9 I

ATARI Home Computer

7-S

COLOR BARS

Does MENU appear
(Refer Flgiare 3-3)

YES

Press C and

RETURN

0o«9 screen look
like Figure 3-4

Can you adjust R309
to the proper color

YES

Adjust a309

Does screen look
like Figure 3-4

Repeat POWER UP,
Page 7-2

Go to COLOR BAA
TROUBLESHOOTING.
Page 7-10

yg5 Go to TIA ?aae 7-13

Go to COLOR BAR

TROUBLESHOOTING ,

Page 7-10

IS5- J Go to TIA. Pag>. 7-13

ATARI Home Computer

7-9

8QQ COLOR BAR
TROUBLESHOOTING

Swmp-out A301 And
A302 on CPU Board

Does 5cre«n look
like Figura 3-4

Sw«p CPU Board

Ooaa screan look

like Figure i -4

Swap-out A103. Q105
^ind A 104

Does screen look
like Figure 3-4

Go to next page

YES

Go to TIA. Page
7-13

YES

Trace color circuitry

on CPU Board.
Make certain to check
color delay circuit
and a309

JCSS.

Go to TIA, Paste i

7-L3 I

ATARI Home Computer

7-10

800 COLOR BAA
TROUBLESHOOTING (cont )

Verify that each of the following levels and/or
signal wave forms exist before proceeding to
the next step. Use SALT II. COLOR BARS,
locked into the continuous mode.

Is there

3.3SMHX

Swap-out XlOl, Q102
and O103

oscillation at R106
on Motherboard
Refer Figure

YES

Is there input
signal to base of
QI05, Pin 2 Refer
Figure

Trace circuit back to
previous step

YES

Is there output
signal from emitter

of Q105 Refer
Figure

Trace circuit back to
previous step

YES

Is there signal at

JH5, Pin 20
Refer Figure

Trace circuit back

YES

Go to next page

ATARI Home Computer

7-11

3Q0 COLOR BAR
TROUBL£SHOOTING (cont:

Is there signal
at both ends of LZQ2
Refer Figure -

YES

Are the following
present Refer

Figure

+5 on Modulator,
Pin S

Signal on Modulator,
Pins 2 and 4

YES

Does screen look
like Figure 3-4

Trace circuit back to
previous step

Verify Power Supply

volUge at Pin 19

of JUS

Y^5_

Go to TIA. Page
7-13

CaU ATARI Te^h Line
Specialist

Inside California
(800) 672-1466

Outside California
(800) 538-1535
(300) 538-1536

ATARI Home Computer

7-12

TIA TEST

Press I and

RETURN

Does NOT GTIA
appear on screen

Is there a color

rainbow on the

screen

^ — ^ NO

Replace GTIA (A30I)
on CPU Board

YES

Go to GRAY 'BAR

Test. Page 7-1

YES

Go to CRAY BAR
Test, Pa8e7-14i

ATARI Home Computer

7-13

800 GREY BAR

START

Press G and
RETURN

Oo«9 screen looic
like Figure 3-6

Replace CTIA/GTIA
(A3Q1)

Docs screen look
like Figure 3-6

Replace A103

Does screen look
like Figure 3-6

Go to 800 GREY 3 At.

TROUBLESHOOTING,

Page 7-15

YES

JC£S.

Go to ANY VIDEO,
Page 7-18

ATARI Home Computer

7-U

8QQ GREY BAR
TROUBLESHOOTING

Sw«p-out A30I and
A302 on CPU Board

Swsp CPU Board

Oo«9 9er««n look
Uk8 FiguTB 3-6

Swap-out AiQ3, Q105
and A 104

OoM serocn look | YES
Uke Figure 3-6

Go to ANY VIDEO,. }
Page 7-18

YES

Tr»ca color circuitry

on CPU Board.
Make certain to check
color delar circuit
and R309

Does screen look y^?

like Figure 3-6 I

Go to ANY VIDEO
Page 7-18

Go to next page

ATARI Home Computer

7-15

800 GREY BAR
TR0U3LESH00TING (cont)

Verify that each of the following levels and/or
signal wave forms exist before proceeding to
the next step. Us* SALT II, COLOR 5ARS,
locked into the continuous mode.

Is there 3.5SMHz
oseiUatian at R106
on Motherboard
R*f-r Figure

Swap-out XIOI. Q102
and Q103

YES

Is there input
signal to base of
QIOS. Pin 2 Refer
Figure

Trace circuit back to
previous step

YES

Is there output
signal from emitter
of Q105 Refer
Figure

Trace circxiit back to
previous step

YES

Is there signal at

JUS. Pin 20
Refer Figure

Trace circuit back

YES

Co to next page

ATARI Home Computer

7-16

800 GR£Y 3AR
TROUBLESHOOTING (cont)

Is tharv signal
at botli ends of LZOZ
Refer Figure

YES

Are the following

present Refer
Fig\2rs

+■5 on McKlulator,
Pin 5

Signal on Modulator,
W ns 2 and 4

YES

Does screen look
like Figure 3-^.

Trace circuit baqk to
previous step

Trace circuit back to
previous st^

Verify Power Supply
voltage at Pin 19

of J115

J3S.

Go to ANY VIDEO.
Pane 7-18

Call ATARI Tech Une
Specialist

Inside California
(300) 672-1466

Outside California
(800) 538-1535
(800) 538-1536

ATARI Home Computer

7-17

800 ANY VIDEO

START

Press A and

RETURN

Oo«s screen look

like Figure 3- 5

Replace ANTIC
(A302) on CPU

Does screen look
like Figure 3- 5

Replace CTIA/GTIA
(A301)

Does screen look '
like Figure 3-3

Go t= 300 ANY VIDEO
TROUBLESHOOTING,
Paae 7-19

YES

Go to KEYBOARD

Test. Page 7-22

ATARI Home Computer

7-18

800 ANY VIDEO
TROUBLESHOOTING

Sw«p-out A301 and
A302 an CPU Board

Do«s scrsan look
like FiguTB 3-5

Swap CPU Board

Do*s scr««ii look

Ms-L

gun

3-5

Swap-out Aia3, QIOS
and A104

Do«9 screen look
like Figure 3-5

Go to next page

YEo

YES

JC£^

Go to KEYBOARD. {
Page 7-22

Trace color circuitry

an CPU Board.
Make certain to check
color delay circuit
and RSQ*?

Go to KEYBOARD,
Page 7-22

ATARI Home Computer

7-19

800 ANY VIDEO
TROUBLESHOOTING (cont)

Verify that each of the foUowing levels and/or
signal wave forma exist before proceeding to
the next step. Use SALT II, COLOR BARS,
locked into the continxious mode.

Is than

3.38MHz

Swap-out XIOI. Q102
and QI03

oscillation at R106
on Motherboard
Kmfmr Tigure

YES

Is there input
signal to base of
Q109. Ptn 2 Refer
Figure

Trace circuit bacic to
previous step

YES

la there output
signal from emitter

of OI05 Refer
Flgiire

Trace circmt back ro

previous step |

YES

Is there signal at

JUS, Pin 20
Refer Figure

Trace circuit back

YES

Go to next page |

ATARI Home Computer

7-20

300 ANY VIDEO

TROUaLESHOOTING (cont)

.© 1

Is there signal
a,t both ends oi L202
Reier Figure

YES

Are the foUo<ring

present Refer
Figure

■^6 on Modulator,
Pin 5

Signal on Modulator,
Plnajand 4

YES

Docs screen look
like Figxire 3-3

Trace circuit ba,ck to
previous step

Trace circuit back to
previous step

Verify Power Supply
voltage at Pin L9

of J115

JCSS.

^o TO KEYSdAiD,
Page 7-22

CaU ATARI Tech Une
Specialist

Inside California
(300) 672-1466

Outside California
(800) 538-1535
(800) 538-1536

'^^ARI Home Computer

7-21

KEYBOARD

Go to TONE TEST,
Page 7-24

YES

jcsa.

JUlS.

START

Press K and

RETURN

Oo keyboard test

PASS

Did same keys fail as
in PCWSa-UP. PART I

YES

Was it ail or just some
of the keys

SOME

Replace keyboard

PASS

_N0_

Swap-out AlOl, Z103
and Z104

PASS

Go to next page

ALL

ATARI Home Computer

7-22

KEYBOARD (cont)

Troubleshoot, using
following information
and Keyboard
schematie. Page 7-38

TYPICAL KEYBOARD

OUTPUT

Sample oade from
Z104. Pin 14 with
W key depressed.

SCOPS :

rT7/DIV..5mS/DIV
SYNC:

CSX. -t- Trigger

TYPICAL DECODER
OUTPUT

Sample made from
Z104. Pin 3 with
W Icey depressed

SCOPE ;

rr7/DIV. .2mS/DIV
SYNC :

CfSl, ■•• Trigger

Pass

j^ZS.

Go to TONE TEST !
Page 7-24 i

Call ATARI Tech Une
Specialist

Inside California
(800) 672-1466

Outside California
(800) 538-1535
(800) 538-1536

ATARI Home Computer

7-23

800 TONE TEST

START

Press T and
RETURN

Enter voice number
to be tested (X-4)
and Preaa RETURN

Test remaining
three voices

YES

Did you hear all
eight tones or
speaker clicks*

PASS

YES

•The first two tones are very
high in frequency; thus,
they may be inaudible to some
ears. The TV speaker clicks
from the DC level shifts can
be heard for each tone.

Replace POKEY
(AlOl) and retest

Go to CONSOLE
SWITCH TEST,
Pag« 7-28

PASS

YES

Go to START,
this page

Lock SALT ri into
CONTINUOUS MODE.

restart test on
VOICE 1, and scope

Pin 37 (AUD) of AlOI

Go to next page

ATARI Home Computer

7-2*

800 TONE TEST (cont)

Is there a frequency
shift aa the frequency

of the tone lowers

and amplitude decays

to Ov

SCOPE :

TTv/ Div. .SmS/Div
SYNC:

* CHI

YES

Press J and

RETURN

Is the screen bUek
with no sound

YES

Press SPACE BAR

Did y iu hear a

single test tone

This re-runs the first

two steps of this

test

:ia

Go to D, next page

YES

Press SYSTEM

RESET, T, RETURN,
1, and RETURN

PASS

CaU ATARI Tech Une
Specialist

Inside California
(800) 672-1466

Outside CaUfomia
(800) 538-1535
(300) 538-1536

YES

Go to CONSOLE
SWITCH TEST. .
Page 7- 28

ATARI Home Computer

7-25

800 TONE TEST (cont)

la R157 (IK) shorted

YP.^

Repair and retest

VTTS

Are Ciai(l.uf).
R167{18K), or
R195(4.7K) epen

Repair and retest

VP«I

Are C178(,0OIuf),

ClS0(.22uf). or

R166(1K} shorted or

open

Repair and retest

YT?.<?

Can you verify the
following;

1) 4.5 MHz .oscillation
by connecting a
scope to the emitter
of QI06

2) A sine wave ^ 2.3
centimeters 3
.luS/Div and
20mV/Div which
equals ^ 4.SMHZ

3} Can you adjust LlOl
to equal 4.5MHz

Verify input to Audio

>\4ixer by connecting

scope (.5mS/Div,

5mV/Div) to collector

A 104, Pin 2

Are waveforms
same as AlOl, Pin
37 (except wave-
form is rounded, not
square)

NCI

Return to START.
Page 7-24

YES

Repair and reteat

Is there output on
A104, Pin 5 (scope
.5mS/Div.50mV/Div)

Replace A 104 and

Tfitrmt

YES

Go to next page

ATARI Home Computer

7-26

800 TONE TEST (cont)

Adjust A203 to Ch3.
verify TV is tuned
to Ch3 and fine
tuning is adjusted to
a clear picture and
turn the volume up

Retest

PASS

YES

Re-run retnainder of

tone test for other

three voices

PASS

.^n

Cali ATARI Tech Une!
Specialist

Inside California
(800) 672-1466

Outside California
(800) 538-1535
(800) 538-1536

YES

Co to CONSOLE

SWITCH TEST,

Page 7-28

ATARI Home Computer

7-27

800 CONSOLE SWITCH TEST

Press S and
RETURN

Press each (4)
Console Switch

YES

PASS

Go to VERIFY ROM,
Page 7-29

Does console speaker

"BEEP" when any

Console Switch is

pressed

Are Ria4 - R187 or

C165 shorted or

open

YES

Replace and retest

YES

Replace CTIA/GTIA

CA301) on CPU

Board and retest

PASS

Go to VERIFY ROM.
Page 7-29

YES

Did a single
switch fail

Call ATARI Tech Line
Specialist

Inside California
(800) 672-1466

Outside California
(800) 538-1535
(3001 S^fl-1536

ATARI Home Computer

7-2%

300 VERIFY ROM

Verify ROM Test is
locked into CONTIN-
UOUS MODE and
is displaying each
ROM checksum and
the word PASS or
FAIL

C-STARIJ)

Press V and
RETURN

PASS

YES

. Go to RA^ Test.
Page 7- 31

Press D and RETURN

" Press E and RETURN

Press C and RETURN

Press V and RETURN

■(Trt

Did ROM D ful

YES

Replace A402 and
retest

Old ROM E fail

YFS

Replace A403 and
retest

Pid Rf?W ^ f'i' 1

YES

Replace A401 and
retest

YES

Did all ROMs fail

Replace A401 - A403
and retest

Swap-out 2401 - Z403

Go to next page 1

ATARI Home Computer

7-29

300 VERIFY ROM (cont)

PASS

YES

Go to P.AM Test,

YES

Page 7- 31

Is 02 clock present
at Pin 10 of Z403

Trace 02

(Refer CPU Board

on Page 5-10).

and retest

PASS

Call ATARI Tech Une
Specialist

Inside California
(800) 672-1466

Outside California
(800) 538-1535

YES

Go to RAM Test.
Page 7-31

(300)

835-1536 1

ATARI Home Computer

7-30

300 RAM

Press R and
RETURN

Enter tha amount

of RAM to be tested

(Refer Page 3-12)

PASS

YES

Press SYSTEM RESET YES

The SALT tl MENU is

returned to the

screen - it tells

you how much RAM

is resident.

Go to PORT T-st,
Page 7- 33

Did you select

more RAM to test

than is resident in

the console

Go to RAM START

Press D and RETURN
Press E and RETURN
Press C and RETURN
Press R and RETURN

RAM TEST MATRIX

is returned to the

screen (See Figure

7-2 and use the

LEGEND provided in

Table 7-2 to decode

failure )

Repair components
and retest

Go to next page

ATARI Home Computer

7-31

500 HAM (cont)

PASS

YES

Go to PORT Test,

Page 7-33

CaU ATARI Tech Une
Specialist

Inside California
(800) 672-1466

Outside California
(800) 538-1535
(300) 53S-1S36

ATARI Home Computer

7-32

. 300 PORT TEST

Preaa P and

RETURN

Install Hand
ControUer Jack test

connector and

Peripheral PORT test

connector

Presa RETURN

PASS

YES

Bum-in Consols for

minimum oi eight
hours

Reseat Test

connectors and

retest

PASS

YES

Use Table 7-3 to
decode error taatrtx,

replace and repair

defective components

and retest

Go to next page

ATARI Home Computer

7-33

800 PORT TEST (cont)

PASS

J^S,

Bum-in Console for

tQinimum of eight

hours

CaU ATAIU Tech Une
Specialist

Inside California
(800) 672-1466

Outside California
(800) 538-1535
(300) 538-1536

ATARI Home Computer

7-3^

THIS PAGE INTENTIONALLY LEFT BLANK

ATARI Home Computer 7-35

Table 7-1

CLOCK CIRCUIT

PIN NUMBER

21 of JlOl

22 of JlQl
a of 2.302
9 of 2302

10 of 2302

13 of 2302

37 of A303

S of 2301

34 of A302

35 of A302
29 of A301
23 of A301
Collector of Q102
Collector of Q104-

7 of AlOl
25 of A102

BOARD

CPU

300 Main Board

400 Main Board

400/800 Main Board

400/aOO Main Board

FREQUENCY

.789

.739

.789

.140

.789

.73 9

.579

,5 79

,579

.5 79

5 79

739

789

SCOPE CHART # *

* Use Scope Waveform Legend on next
illustration of waveform.

page to see

ATARI Home Computer

7-36

Scope Wavafona 1 luS/Dlv IV/DIV

Scops Waveform 2 luS/DIV rV/DIV

Scope Mavefona 3 luS/DIV IV/DIV

Scope Waveform 4 luS/DIV IV/DIV

/^ A /i, A

y u u u

r I I

Scope Haveform 5 luS/DIV IV/DIV

n n t\

Scope Waveform s lus/DIV IV/DIV

Scope Waveform Leaend

ATARI Home Computer

7-37

Keyboard
Connection
Chart

PIN CONNECTOR
NUMBERS NUMBERS

400/2102 iOO/JlOS
300/2103 a00/J106

-15
!_

— 8

-23

-22

-30

-44

-7

-50

=56

—24

-21

-37

-36

-37

h-9

-10

— 6

-5

— 4

-23

-26

-20

-19

• 38
I

-39

-3S

-51

•49

-34

-52

-48

AlOl

-11

-18

-40

-33

-53

-47

hi 2
I

-3

-27

-17

-41

-32

-54
I

-46

-13

-14

-2

-28

-16

-42

-31

-3S

-45

-29

-43

CONNECTOR
NUMBERS

600/J105
800/J106

600/2101
800/Z104

PIN
NUMBERS

Legend

KSC

15.

BRMr

29.

RTTUSN

43.

CAPS

LOWR

16.

CLR SET
TAB

30.

CRTL

44.

SHIFT

17,

31.

45.

18.

32.

46.

19.

33.

47.

20.

34.

48.

21.

35.

49.

1
7

22.

36.

50.

23.

37,

51.

10.

(
9

24,

33.

52-

[

)

25.

39.

53.

12.

Cl-LAK

26.

40.

54.

— 7 ■■— -
/

13.

INSERT

27.

f _

*l.

55.

/l\

14.

DELi-Ii:
3ACX S

28.

♦ _ 1

42.

- A

56.

SHIFT

57 . SPACE

BAS

ATARI Home Computer

7-3A

?§§0 3^^
B 0100 000
C 0001 0000
D 0000 1000
E 0000 0000

RAM TEST

TESTING 40 K

0004-
0004

ERROR
COUNTER

TEST
COUNTER

0«f«ctiv« RAM Seards

DcfKtiv« RAM Idwitifia

0«f«ci

Indie aior

B4 and B3

B&(or
54 and B«

B3 and B«t

or
ai, 35 and

Description

lit SK Block

2nd SK Block

3rd SK Block

tih SK Slock

□iffaranco

Calumn

Description

1«K

ZS12

ZJ12

ZSll

ZJIl

Z310

Z3I0

Z30S

Z309

Z3W

Z30S

2307

Z303

Z306

Z30«

Z303

B7jor
B4 and 37

3in 8K Block

Figure and Table 7-2
ATARI Home Computer 7-39

Table 7-3
Port Test Legend

A
B
C

D
£
F

G
H

7 6 5 4

ATARI Home Computer

7-^0

SECTION S

GAME CONTROLLERS

The following pages contain descriptions, schematics, and test procedures for the four
game controllers used with the Atari *00/800 Computer Consoles-

30YSTICK (X-Y CONTROLLER)

Inside each joystick is a small PC board that has 5 calculator-type keypads mounted on
it. Four of these are positioned beneath the stick in square shaped pattern, and the
fifth is tocated beneath the pushbutton (See Figure 8-1). When the stick is pushed
forward, the bottom surface of the stick presses against the forward keypad, causing it
to "make", thus completing the circuit connected to it. In the same way, pushing the
stick back, left and right causes the respective keypad underneath that position to
close and complete the circuit.

ATARI Home Computer 8-1

Figure 8-1. Joystick (X-Y ControUer)

If the stick is pushed forward and to the right at the same time (that is, in a northeast
direction), both the forward and right keypad ck)se simultaneously, which causes the
POKEY to see two switch closures happening at once (See Figure S-2). The result is
that the object being controlled on the screen moves diagonally. With the four
keypads, 8 different directions can be attained. The pushbutton determines whether
the keypad beneath it is either open or closed. (Earlier models were spring loaded.)

ATARI Home Computer

8-2

Figure 8-2. Joystick Schematic

JOYSTICK (X-Y CONTROLLER) CHECK

Equipment Needed

1) T.V. Set

2) Known good console

3) Star Raider cartridge

Procedure

1) Check for cosmetic damage-

2) Plug in cartridge and piug controller to be tested in the left player port.

3) Press RESET.
^) Play game.

5) Move the joystick in the eight possible directions.

6) Test is now completed.

ATARI Home Computer

S-3

GAME PADDLE

Each game paddle consists of 1 Megaohm potentiometer that, when varied, causes
different values to be seen and acted upon by the POKEY. Also contained in the paddle
is a simple spring loaded push-to-make pushbutton switch (See Figure 8-3). There are
two game paddles connected to each I/O plug.

Figure 8-3. Game Paddle

ATARI Home Computer

8-^

BUTTON
CONTROL I

POT !

<f-

Vtc S VOLTS

6ND

GREEN

Y CABLE DUAL 4 CONDUCTOR
C0I08I0

VIOLET

m BUTTON

t^ CONTROL 2 ^^

P0T2

\fcc5 VOLTS

6N0

«■

YELLOW

BLACK

BROWN

RED

PIN 3
RN9

PIN 7
PINS

PIN 4
PINS

Figure 8-4. Game Paddle Schematic
GAME PADDLE CONTROLLER CHECK

Equipment Needed

1) T.V. set

2) Known good console

3) Super Breakout cartridge

Procedure

1) Check for cosmetic damage.

2) Plug in cartridge and plug controllers to be tested into the left player port.

3) Press RE5ET-

4) Press the button on one of the controllers. A ball should be served.
5. By turning the knob the paddle should move under the ball.

6) Repeat steps 3, *, & 5 for the other controller.

ATARI Home Computer

S-5

SECTION 9

This section is divided into two parts. The first part contains a complete listing of ail
ATARI t^OO Computer parts; and, the second part contains a complete listing of all ATARI
800 Computer parts.

» = Identifies parts available through ATARI Sa 'cs Order Processing.

ATARI Home Computer 9-1

ATARI *00 COMPUTER CONSOLE PARTS LIST

PARTS LIST

Assy

Part No.

-CA010112

-C01W19

BASE

-S8-1006

BASE

CA01^309

BASE

CAO 15992

BASE

- C0U013

CABLE

78-2^001

CABLE

- A0036*7

CABLE

- CA01if85l

CABLE

C010389

CONSOLE

CAOI*151-01

CONSOLE

CA0U151-02

CPU

- U-5102

CPU

1^-5 1 RO

CPU

1^533^

CPU

- l*-5472

CPU

- 19-41150*

CPU

CA017173

CPU

- CO 12296

CPU

C0U181-O1

CPU

C014181-02

CPU

C0U181-03

CPU

» CCUSU

CPU

- C014313

CPU

- C01«*0

CPU

- 0014377

CPU

» 0014384

CPU

- C014386-02

CPU

» C014386-05

CPU

"" C014386-09

CPU

- C014805

CPU

- C016074

DOOR

CA014i53

DOOR

- C014016

DOOR

- C014013

DOOR

C014019

DOOR

C014020

DOOR

C014103

Description

ANTENNA SWITCH BOX ASSY
AC POWER ADAPTOR
RUBBER FEET
CONSOLE BASE ASSY
CONSOLE BASE ASSY

CONSOLE BASE

CABLE TIE

COAXIAL CABLE ASSY

CABLE ASSY

TORROID CORE

CONSOLE ASSY (8K)

CONSOLE ASSY (16K)

RESISTOR IK

RESISTOR I OHM

RESISTOR 330K

RESISTOR 4.7K

RESISTOR VARIABLE 500K

PC BOARD ASSY (CPU CARD)

IC ANTIC

CAP. CERAMIC AXIAL

.OOIUF (25V)
CAP. CERAMIC AXIAL

.01 UF (25V)
CAP. CERAMIC AXIAL

.1UF(25V)
IC 74LS74
IC 74LS244
IC 74LS02
IC MPU (6502B)
INDUCTOR FERRITT BEAD
SOCKET IC (14 Pin)
SOCKET IC (20 Pin)
SOCKET IC (40 Pin)
IC GTIA

NEOPRENE PAD
DOOR ASSY
CARTRIDGE DOOR
DOOR LATCH
HINGE BRACKET
DOOR SHIELD
FOAM PAD

Location

(ALTERNATE LISTED)
(ALTERNATE FOR
P/NCA014309)

R302-306
R312,313
R30?

R307,31 0,3 11
R309

A302

C307

C303,306

0301,302,304,305

Z302

2303,304

2301

A303

L301,302

2301,302

2303,304

A301-303

A301

ATARI Home Computer

9-2

ATARI WO COMPUTER CONSOLE PARTS LIST

PARTS LIST (cont)

Assy

Part^4o.

DOOR C01410*

EPROM CA060053

FINAL *CA01^U1-01

FINAL ■■CAOl^UI-02

K£YBOARr>CA01*03l
KEYBOARO-CA017999

MAIN

MAIN
MAIN

. 1*-5102

1*-5103

1*-5105

-1*-5123
1^-5124
1^5151
I*-5153

• U-5182

• 1^-5183
1^5271
U-5272
1^^-5303

• l*-5332
■1*-5*71
•U-5*72
■ l*-5*73

l*-5623
'I'*-5682
•1^5912

21-101473
►3I-1N9U

• 33-2N3906
' 34-2N3563
■ 34-2N3904

C01W89
■CA0118W
•CA014807

C010177
■CO10448

C010816
C010S21
C0I0822

Description

CARTRIDGE DOOR SPRING
EPROM CARTRIDGE (16K)
ATARI HCS COMPUTER {8K)
ATARI HCS COMPUTER (I6K)
KEYBOARD ASSY
KEYBOARD ASSY

Location

RESISTOR

RESISTOR I2K

RESISTOR 120K

RESISTOR

CAP. MYLAR

DIODE 1N9U

TRANSISTOR

100 OHM
IK
lOK
lOOK
1 MEG

150 OHM

15K

1.SK

18K

270 OHM

2.7K

30K

3,3K

470 OHM

*.7K

*7K

'f70K

62K

6.3K

9.1 K

.0*7UF

2N3906

2N3563

2N3904

CONNECTOR EDGE (15/30)
SPEAKER ASSY (63 OHM)
PC BOARD ASSY (MAIN)
CRYSTAL 3.579575 MHZ
CONNECTOR SOLDER

RT ANGLE (9 PIN)
BUFFER HEX CMOS (CDW50)
CAP. POLY 820PF
INDUCTOR 2UH

REPLACEMENT LISTED
(REPLACEMENT FOR
CA0U031)
RlOl-118,,155

R160,l 62,169,172

R165

R182

R181

R168,173,177

R179

R119-123,113*-154

R167,176

R126-133,16*

R161,i71

R158

R185

R178

R175

R156,18*

R170,i7ff

R12'*,125

R183

R180

R166

R163

0135-1*2,181

CR10l,103

Q103,10i^,107

Q105

Q102

J108

XlOl
JlOl-lOf*

Alll

0177,178

L102

ATARI Home Computer

9-3

ATARI *00 COMPUTER CONSOLE PARTS LIST

PARTS LIST (cont)

Assy

Part No.

Description

Location

MAIN

-C010823

INDUCTOR VARIABLE 0.6-1 .2UH

LlOl

MAIN

* CO 1 229a

IC POKEY

AiOl

MAIN

-CO 12399

IC ROM (2K)

A105

MAIN

»C012f>99

IC ROM (4K)

AlO*

MAIN

C01*017

BOrrOM PLATE

MAIN

-C01*021

CARTRIDGE SOCKET

3108

MAIN

C01*179-03

CAP. CERAMIC AXIAL lOPF (50V)

CI 87

MAIN

C0iai79-05

CAP. CERAMIC AXIAL i^7PF (50V)

Cia3,i9*,196

MAIN

C0l*179-12

CAP. CERAMIC AXIAL 68PF (50V)

C193,195

MAIN

COi^l 80-03

CAP. CERAMIC AXIAL lOOPF (50V)

CI 85

MAIN

C01*181-01

CAP. CERAMIC AXIAL

ClOl-125,127-13*,

.001UF(25V)

1*3-162,165-171,

184,201

0159-162,173-176,

MAIN

C0U181-O2

CAP. CERAMIC AXIAL

.01UF(25V)

180, 197-199

MAIN

C0I*181-03

CAP. CERAMIC AXIAL

C126,163,16*,.172,

.1UF(25V)

179,182,186,188-191

202

J109

MAIN

-C0ia322

CONNECTOR EDGE (22/W)

MAIN

-C0U323

CONNECTOR EDGE (28/56)

JUO

MAIN

-C01W36

IC W51B

Z101,102

MAIN

"-C0U339

IC 7*LSiO

ZIO*

MAIN

* C0U3aa

IC 7*LS138

Z105

MAIN

- C0i4361

IC 7f^LS*2

Z103

MAIN

C0U371

CAP. ELEC AXIAL lOUF (16V)

CI 92

MAIN

C0U379

RESISTOR NETWORK (9 X *.7K)

R150,159

MAIN

C014380

INDUCTOR 22UH

L115-117

MAIN

* C0U384

INDUCTOR FERRITT BEAD

L103-ll*,118

MAIN

- C0ia386-02

SOCKET IC (l^PIN)

ZIO*

MAIN

-C0U386-03

SOCKET IC (16 PIN)

Aill,Z101-l03,105

MAIN

C0U386-07

SOCKET IC (2* PIN)

A103-105

MAIN

-CQU386-09

SOCKET IC (*0 PIN)

A101,i02

MAIN

C01^39*

TRANSISTOR MP506

QlOl

MAIN

- CO 1*599

IC ROM (4K)

A1Q3

MAIN

C0U718-O1

CONNECTOR HEADER

3107

MAIN

C01*720-01

HEADER RT ANGLE

3106

MAIN

C014778-02

CONNECTOR (22 PIN)

J105

MAIN

C01*785

CONNECTOR SUPPORT BRACKET

MAIN

» C0U795

IC PIA (6520)

A102 (ALTERNATE
LISTED)

MAIN

» C01(f809

TRANSISTOR (MPSA55)

Q107

MAIN

C0U812

IC PIA

Ai02 (ALTERNATE
FOR P/N C0U795)

ATARI Home Computer

9-4

ATARI WO COMPUTER CONSOLE PARTS LIST

PARTS LIST (cont)

Assy

Part No.

Desoriotion

Location

MAIN

C015367

FI5HPAPER INSULATOR

MAIN

-C0I6326

fCB STABILIZER

MAIN

C060163-02

CAP. CERAMIC AXIAL

C203 (MUST BE

(EPOXYCASE).OIUF

EPOXY CASE)

MODULE

CA01*I52-9I

MODULE ASSY

MODULE

CAOUZl^

CASTING ASSY

PWR SUPP

1*-5331

RESISTOR 330 OHM

R201

PWR SUPP

- l*-5682

RESISTOR 6.8K

R203

PWR SUPP

■• 79-5903

CONNECTOR PHONO JACK

J203

PWR SUPP

-CA01217*

MODULE RF "B"

A203

PWR SUPP

-CA0U155

PC BOARD ASSY (POWER SUPPLY)

PWR SUPP

CA01*708

HEATSINK ASSY

PWR SUPP

» C01039*

CAP, POLY FILM .22UF

0203,208,211

PWR SUPP

C010470

SHIELD RF MODULE

PWR SUPP

C010*71

COVER RF MODULE

PWR SUPP

» C0i22*l

SWITCH CHANNEL SELECT

S201 (ALrERNATE
FOR P/N C0122W)

PWR SUPP

- C0122*2

SWITCH CHANNEL SELECT

S201 (ALTERNATE

LISTED)

3202

PWR SUPP

»C012995

CONNECTOR RT ANGLE (13 PIN)

PWR SUPP

CO 14069

LED STANDOFF

PWR SUPP

-C0U075

PLUNGER INTERLOCK SWITCH

PWR SUPP

C01W92

HEATSINK

PWR SUPP

COUlSl-Ol

CAP. CERAMIC AXIAL

.001UF(25V)

0212,213

PWR SUPP

C0U181-03

CAP. CERAMIC AXIAL .lUF (25V)

C206

PWR SUPP

»C0U3*8

VOLTAGE REGULATOR (5V)

A202

PWR SUPP ■■

-C0U349

VOLTAGE REGULATOR (12V)

A201

PWR SUPP

C0U370

CAP. ELEC AXIAL 470UF (16V)

C20 1,202

PWR SUPP

C01W71

CAP. ELEC AXIAL lOUF (16V)

C207

PWR SUPP

C014373

CAP. ELEC AXIAL 2200UF (16V)

C204,205

PWR SUPP

C014374-01

CAP. ELEC RADIAL a700UF (i6V)

C209 (ALTERNATE
FOR P/N C01i^37if-C

PWR SUPP

C01if374-02

CAP. ELEC RADIAL a700UF (16V)

C209 (ALTERNATE
LISTED)

PWR SUPP

C0U383

INDUCTOR lUH

L201

PWR SUPP "-couas*

INDUCTOR FERRITT BEAD

L202-205

PWR SUPP » 001^387

SWITCH POWER INTERLOCK

S202

PWR SUPP

C0U393

CAP. ELEC AXIAL 22UF (16V)

C210

PWR SUPP

C0l4397-0t

SWITCH POWER

5203

PWR SUPP

C014715

POWER JACK

32Qti-

PWR SUPP

C0U716-02

CONNECTOR SOCKET (20 PIN)

3201

PWR SUPP

C0U771

RESISTOR 33 OHM

R202

PWR SUPP .

► C014777

LED DIODE

CR210

ATARI Home Computer

9-5

ATARI WO COMPUTER CONSOLE PARTS LIST

PARTS LIST (cont)

Assy

Part No.

DescriDtion

Location

PWR SUPP

C0U796

RIVET NYLON

(ALTERNATE FOR
P/N CO 15344)

PWR SUPP

" C0U808-OI

DIODE ZENER 1N5231B

(5.iV)

CR201

PWR SUPP

00153^4

RIVET NYLON

(AL 1 hRNATE LISTED)

PWR SUPP

CO 17988

DIODE (1N5391)

CR206-209

RAM

- 14-5221

RESISTOR 220 OHM

R501

RAM

- CAO 14801

PC BOARD ASSY (8K)

RAM

-CA014802

PC BOARD ASSY (16K)

RAM

C014179-05

CAP. CERAMIC AXIAL

47PF (50V)

C518

RAM

C014181-01

CAP. CERAMIC AXIAL
.001UF(25V)

C521-523

RAM

C014181-02

CAP. CERAMIC AXIAL

.OIUF (25V)

C503,507 ,511,515

RAM

C014181-03

CAP. CERAMIC AXIAL

.1UF(25V)

0501,502,504-506
508-510,512-519

RAM

-C014313

IC 74LS244

Z502

RAM

-C014331

IC RAM

Z505-512

RAM

-C014339

IC 74LS10

Z501

RAM

-CO 1 4345

IC 74LS158

Z503,504

RAM

-CO 14386-02

SOCKET IC (14 PIN)

A501

RAM

-CO 14386-03

SOCKET IC (16 PIN)

A503-512

RAM

» C014386-05

SOCKET IC (20 PIN)

A502

RAM

C014804

INDUCTOR AXIAL LEAD 4.7UH

L501

TOP

CA014782

TOP COVER ASSY

TOP

- C014014

CONSOLE TOP

ATARI Home Computer

9-6

ATARI 800 COMPUTER CONSOLE PARTS LIST

PARTS LIST

Assy

Part No.

-■CA010112

»C01*319

BASE

SS-1006

BASE

CA0U116-01

BASE

CA0Uil6-O2

BASE

►00129^

CPU

»1*-51Q2

CPU

l*-51R0

CPU

l*-533*

CPU

» U-5^72

CPU

» 19-41150*

CPU

CA017173

CPU

-C012296

CPU

COl^lSl-OI

CPU

C0U181-O2

CPU

COUlSl-03

CPU

"-C01i^311

CPU

-C014313

CPU

-COi^SW

CPU

-coi^ary

CPU

»C01*38*

CPU

»C01*386-02

CPU

-C01W86-05

CPU

-COl 4386-09

CPU

-C014805

CPU

» CO! 6074

CABLE

78-24001

CABLE

» A003647

CABLE

►CA014851

CABLE

C010389

CONSOLE

CAO 14074-01

CONSOLE

CAO 1 4074-02

CONSOLE

CAO 14074-03

DOOR

CA014038

DOOR

CAO 14848

DOOR

CO 12778

DOOR

0012779

DOOR

••C012939

DOOR

■•CO 12940

DOOR

C014093

Description

ANTENNA SWITCH BOX ASSY

AC POWER ADAPTOR

RUBBER FEET

LOWER COVER ASSY (8K)

LOWER COVER ASSY (16K)

LOWER COVER

RESISTOR IK

RESISTOR iOHM

RESISTOR 330K

RESISTOR 4.7K

RESISTOR VARL\BLE 500K

PC BOARD ASSY (CPU CARD)

IC ANTIC

CAP. CERAMIC AXIAL
.00IUF(25V)

CAP. CERAMIC AXIAL

.0IUF(25V)
CAP. CERAMIC AXIAL

IC 74LS74

IC 74LS244

IC 74L502

IC MPU (6502B)

INDUCTOR FERRITT BEAD

SOCKET IC (14 PIN)

SOCKET IC (20 PIN)

SOCKET IC (40 PIN)

ICGTIA

NEOPRENE PAD

CABLE TIE

COAXIAL CABLE

CABLE ASSY

TORROID CORE

CONSOLE ASSY

CONSOLE ASSY (8K)

CONSOLE ASSY (16K)

DOOR ASSY

SHIELD ASSY

REAR SHIELD

CARTRIDGE SHIELD

CARTRIDGE COVER

REAR COVER

SPRING

Location

R302-306

R312,313

R308

R307 ,310,311

R309

A302
C307

C303,306

0301,302,304,305

Z302

Z303,304

Z301

A303

L30 1,302

Z301,302

Z303,304

A301-303

A301

(RF CABLE)

ATARI Home Computer

9-7

ATARI SOO COMPUTER CONSOLE PARTS LIST

PARTS LIST (cont)

Assy

Part No.

DOOR

C01*8*3

DOOR

C0U847-O1

DOOR

C01*8*7-02

DOOR

C01532*

FINAL

CA0I*U6-OI

FINAL

CA01*l*6-03

KEYBOARD

CA0I2952-0I

KEYBOARD

CA012952-02

KEYBOARD CA0U002
KEYBOARD CA015319
KEYBOARD C0U7I0-03
KEYBOARD C01531&

MAIN »U-5lOi

MAIN

-U-5102

Description

INNER SHIELD

FOAM STRIP

PAD

ATARI HCD 800 COMPUTER (8K)

ATARI HCD 800 COMPUTER (16K)

KEYBOARD ASSY

SWITCH ASSY
CABLE ASSY
CONNECTOR HOUSING
RIBBON CABLE
RESISTOR 100 OHM

RESISTOR IK

Location

MAIN

U-5103

RESISTOR

lOK

MAIN

U-5I0^

RESISTOR

iOOK

MAIN

i£^-5l05

RESISTOR

I MEG

MAIN

U-5I21

RESISTOR

120 OHM

MAIN

U-5182

RESISTOR

1.8K

MAIN

-.li^-5183

RESISTOR

ISK

MAIN

-U-5221

RESISTOR

220 OHM

MAIN

1^-5222

RESISTOR

2.2K

MAIN

I*-527I

RESISTOR

270 OHM

MAIN

U-5272

RESISTOR

2.7K

MAIN

-U-5332

RESISTOR

3.3K

MAIN

U-5363

RESISTOR

36K

MAIN

1^-5392

RESISTOR

3.9K

MAIN

«.l*-5471

RESISTOR

i^70 OHM

MAIN

- 1^-5^72

RESISTOR

4.7K

MAIN

»i*-5*73

RESISTOR

47K

MAIN

lif-547a

RESISTOR

*70K

MAIN

1^^-5681

RESISTOR

680 OHM

MAIN

li^-5750

RESISTOR

75 OHM

MAIN

-U-5912

RESISTOR

9.1K

MAIN

21-iaU73

CAP. MYLAR .0^7UF (lOOV)

EARLY VERSION
(WHITE RIBBON)
PRESENT VERSION
(MULTICOLOR RIBBON)

R101,105,107,

110-126,168-17^,

13^-187

R102,l 57,160,162,

165,166,199,202

R16i,198

R155

Ri5^

R201

R130-137,190

Ri67,i81,191,206

R138-153,175-178,

200

R163,179

R106,203

R159

R164,196

R180

R205

RIO^

R183,i92-195,i97

R127,128

R156

R103,108,109

RlS9,20f^

R182.IS3

CI 27-1 3^

(ALTERNATED LISTED)

ATARI Home Computer

9-8

ATARI 800 COMPUTER CONSOLE PARTS U5T

PARTS LIST (cont)

Assy

Part No.

MAIN

-3I-IN91^

MAIN

- 33-2N3906

MAIN

» 3't-2N3563

MAIN

*3*-2N3904

MAIN

-CA0118W

MAIN

► CA01*709

MAIN

CA0U829

MAIN

-C0I017*

MAIN

-C010177

MAIN

•C0I0394

MAIN

-CO 1 04*8

MAIN

-C010727

MAIN

■.C010816

MAIN

■•C01Q821

MAIN

-C010822

MAIN

» C010823

MAIN

C01229*

MAIN

C01*l 79-02

MAIN

CO U 179-03

MAIN

C014179-04

MAIN

CO U 180-03

MAIN

CO U 180-05

MAIN

C0U180-09

MAIN

C01*181-0i

MAIN

C0U181-02

MAIN

C01ifl81-03

MAIN

C0U181-05

MAIN

COU322

MAIN

C0U323

MAIN

»C0iif336

MAIN

-C0U347

MAIN

-C0U361

MAIN

"-C01^362

MAIN

C01437I

Desg-iotion

DIODE 1N914
TRANSISTOR 2N3906
TRANSISTOR 2N3563
TRANSISTOR 2N3904
SPEAKER ASSY (63 OHM)
CABLE ASSY
PC BOARD (800 MAIN)
TRANSISTOR ARRAY
CRYSTAL 3.59575 MHZ
CAP. POLY FILM .22UF (lOOV)
CONNECTOR SOLDER
RT ANGLE (9 PIN)
CONNECTOR RT ANGLE (9 PIN)

HEX CMOS (CDW50)

CAP. POLY 820PF (50V)

INDUCTOR 2UH

INDUCTOR VARIABLE 0.6-1.2UH

IC POKEY

CAP. CERAMIC AXIAL H-7P^ (50V)

CAP. CERAMIC AXIAL lOPF (50V)

CAP. CERAMIC AXIAL 33PF (50V)

CAP. CERAMIC AXIAL lOOPF (50V)

CAP. CERAMIC AXIAL 200PF (50V)

CAP. CERAMIC AXIAL .047UF (50V)

CAP. CERAMIC AXIAL .OOIUF (25V)

CAP, CERAMIC AXIAL .OIUF (25V)

CAP. CERAMIC AXIAL .lUF (25V)

CAP. CERAMIC AXIAL .22UF (25V)

CONNECTOR EDGE (22/44)

CONNECTOR EDGE (28/56)

IC 405 IB

IC 74LS243

IC 74LS42

IC 74LS32

CAP. ELEC AXIAL lOUF (16V)

Location

CR101,102,1 04-108

Q102,103

Q106

Q10i,104,105

aii4

A104
XlOl

C103,180

aiio-113

(ALTERNATE LISTED)

ailO-113 (ALTERNATE

FOR P/N CO 10448)

A103

0169,173

L102

LlOl

AlOl

C171

C161

C163

CI 64,1 70

C174-176

CI 27-1 34 (ALTERNATE

FOR P/N 21-101473)

0104-121,123,

135-160,165,177,178

182-188,194-197,

200

0101,124,125,

190-193

0122,126,162,172,

181,189,198

C103,180 (ALTERNATE

FOR P/N C010394)

ai02-104,107

3101

Z103,104

2105,106

ZlOl

Z102

C199

ATARI Home Computer

9-9

ATARI 800 COMPUTER CONSOLE PARTS UST

PARTS LIST (cont)

Assy

PartNo-

MAIN

CO 14379

MAIN

-C014384

MAIN

-C0U3S6-O2

MAIN

-C014386-03

MAIN

-C0U386-O9

MAIN

C01W89

MAIN

C0U392

MAIN

CO U7 18-02

MAIN

C014720-01

MAIN

► C0U795

MAIN

» C0U809

MAIN

C01i^8^2

MAIN

C015306-01

MAIN

C01534*

MAIN

C015352

MAIN

-C016103

MODULE

CA0IW73

MODULE

CAO 16236

MODULE

C012763

MODULE

» CO 12764

MODULE

» C012955

MODULE

* COUOOl

MODULE

C0US37

PWR SUPP

14-5331

PWR SUPP

■• U-5912

PWR SUPP

21-101474M

PWR SUPP

■'31-1N4001

PWR SUPP

* 79-5903

PWR SUPP

•►CAO 11 620-01

PWR SUPP

CAOl 1620-02

PWR SUPP

-CA012174

PWR SUPP

-CA0U171

PWR SUPP

CAQ1470S

Descriotion

RESISTOR (9 X 4.7K)
INDUCTOR FERRITT BEAD
SOCKET IC(14 PIN)
SOCKET IC (16 PIN)
SOCKET IC (40 PIN)
CONNECTOR EDGE (15/30)
CAP. ELEC RADIAL lOUF (16V)
CONNECTOR HEADER (22 PIN)
CONNECTOR HEADER
RT ANGLE (2 PIN)
IC PIA (6520)

TRANSISTOR (MPS-A55)
IC PIA

CONNECTOR HEADER (18 PIN)

RIVET NYLON (SMAl L)

INSULATOR LOWER SHIELD

SUPPORT BLOCK

MODULE ASSY

CARTRIDGE LOCATOR ASSY

PRIMARY SHIELD (CASTING)

LOWER SHIELD

CARTRIDGE GUIDE

CLAMP

GROUNDING CLIP
RESISTOR 330 OHM
RESISTOR 9,1 K
CAP. MYLAR .47UF(100V)
DIODE (1N4001)

CONNECTOR PHONO 3ACK
SWITCH PUSHBUTTON

SWITCH PUSHBUTTON

Location

R129,158

L103-112

Z105-106,A103-104

ZlOl-104

A101,102

3108,109

C179

J115

3105

A102 (ALTERNATE

LISTED)

Q107

A102 (ALTERNATE

FOR P/NC014795)

J106

MODULE RF "B"

PC BOARD ASSY (800 POWER SUPPLY)

HEATSINK ASSY

(MODULE ASSY -
SECURES CARTRIDGE
DOOR ASSY)

R201,202

R204

C215

CR202-205

ALTERNATE LISTED)

J203

5204-207

(ALTERNATE LISTED)

5204-207

(ALTERNATE FOR

P/N CAOl 1620-01

A203

ATARI Home Computer

9-10

ATARI 800 COMPUTER CONSOLE PARTS LIST

PARTS LIST (cont)

Assy

Part No.

PWR SUPP

» C0I0394

P"'R SUPP

coioazo

PWR SUPP

C010*7l

PWR SUPP

-.C0122*l

PWR SUPP

» C0122*2

PWR SUPP

-CO 12980-0^

PWR SUPP

►C0I2980-05

PWR SUPP

-CO 12980-06

PWR SUPP

■•C012990

PWR SUPP

CO 12992

PWR SUPP

C012995

PWR SUPP

C014092

PWR SUPP

COUl 79-03

PWR SUPP

C01*181-01

PWR SUPP

C01*i3l-03

PWR SUPP ■

•C0U3*8

PWR SUPP i

-C0H3i^9

PWR SUPP

C0U370

PWR SUPP

C01*371

PWR SUPP

C01*373

PWR SUPP

CO 1^37^-01

PWR SUPP

C0i*37iM32

PWR SUPP

C0U3S3

PWR SUPP ■■C01W8*

PWR SUPP •■C01^387

PWR SUPP

C01W88

PWR SUPP

C01*397-01

PWR SUPP >

•C01^398

PWR SUPP

C0U715

PWR SUPP

C01*7I6-01

PWR SUPP

C01*721-01

PWR SUPP

C0U771

PWR SUPP

C0H776

PWR SUPP

C0U796

DeacriDtion

CAP. POLY FILM .22UF (lOOV)
SHIELD RF MODULE
COVER RF MODULE
SWITCH CHANNEL SELECT

SWITCH CHANNEL SELECTS203

KEYTOP (START)

KEYTOP (SELECT)

KEYTOP (OPTION)

KEYTOP (SYSTEM RESET)

JACK PANEL

CONNECTOR RT ANGLE (13 PIN)

HEAKSINK

CAP. CERAMIC AXIAL lOPF (50V)

CAP. CERAMIC AXIAL .OOIUF (25V)

CAP. CERAMIC AXIAL .lUF (25V)

VOLTAGE REGULATOR (5V)

VOLTAGE REGULATOR (12V)

CAP. ELEC AXIAL *70UF (16V)

CAP. ELEC AXIAL lOUF (16V)

CAP. ELEC AXIAL 2200UF (16V)

CAP. ELEC RADIAL *700UF (16V)

INDUCTOR AXIAL lUH

INDUCTOR FERRITT BEAD

SWITCH INTERLOCK

CONNECTOR SOCKET (DIN)

SWITCH POWER

DIODE RECTIFIER (MR501)

JACK POWER

CONNECTOR SOCKET (22 PIN)

CONNECTOR RT ANGLE (* PIN)

RESISTOR 33 OHM

LED PILOT LAMP (MR501)

RIVET NYLON

Location

C203,206

S203 (ALTERNATE
FOR P/N C0122*2
S203 (ALTERNATE
LISTED

320^

C21*

C212,216

C209

A202

A201

C20 1,202

C210,2U

C20f^,205

C207,208

(ALTERNATE FOR

P/N C0U37*-O2)

C207,208

(ALTERNATE LISTED)

L201

L202-206

S201

J205

S202

CR206-209

J206

3201

J202

R203

CR210,211

(ALTERNATE FOR

P/N C0153f^4)

ATARI Home Computer

9-11

ATARI 800 COMPUTER CONSOLE PARTS U5T

PARTS LIST (cont)

Assy

Part No.

PWR SUPP - C01*808-01

PWR SUPP €0153^**

PWR 5UPF

' CO 17988

RAM

* li^-5221

RAM

- CA0U802

RAM

CO U 179-05

RAM

C0l*181-01

RAM

C0U181-O2

RAM

C0lfl81-O3

RAM

»C0l*313

RAM

- C0U331

RAM

*• C0U339

RAM

» 001^3^5

RAM

» C0l*386-02

RAM

■•001*386-03

RAM

-C0U386-05

RAM

C0U80*

ROM

1^-5 1 RO

ROM

U-5222

ROM

-14-5*71

ROM

"•l*-5*72

ROM

CAO 1*090-01

ROM

CA01*803

ROM

-C012399

ROM

-C012*99

ROM

C01*179-05

ROM

C01*179-i2

ROM

C01*181-01

ROM

C0U181-02

ROM

C01*181-03

ROM

C01*3I2

ROM

C0U3*i

ROM

C01*380

ROM

-001*386-02

ROM

"•C01*386-03

ROM

CQl*386-07

ROM

»C01*599

ROM

••C01*3**

Deacription

DIODE ZENER (1N5231B)
RIVET NYLON
DIODE (1N*001)

RESISTOR 220 OHM

PC BOARD (16K RAM) REF.

P/N CA01*13*-03 16K IN PLASTIC

(BOXED)

CAP. CERAMIC AXIAL *7PF (50V)

CAP. CERAMIC AXIAL .OOIUF (25V)

CAP. CERAMIC AXIAL .OIUF (25V)

CAP. CERAMIC AXIAL .lUF (25V)

IC 7*LS2**
IC RAM

IC 7*LS10

IC 7*LS158

SOCKET IC(1* PIN)

SOCKET IC (16 PIN)

SOCKET IC (20 PIN)

INDUCTOR AXIAL LEAD *.7UH

RESISTOR 1 OHM

RESISTOR 2.2K

RESISTOR *70 OHM

RESISTOR *.7K

lOK ROM PERSONALITY

MODULE ASSY
PC BOARD (lOK ROM)
IC ROM (2K)
IC ROM (*K)

CAP. CERAMIC AXIAL *7PF (50V)
CAP. CERAMIC AXIAL 6SPF (50V)
CAP. CERAMIC AXIAL .OOIUF (25V)
CAP. CERAMIC AXIAL .OIUF (25V)
CAP. CERAMIC AXIAL .iUF (25V)
IC 7*LS09
IC 7*L500
INDUCTOR 22UH
SOCKET IC(1* PIN)
SOCKET IC(16 PIN)
SOCKET IC (2* PIN)
IC ROM (*K)
IC 7*LS138

Location

CR201

(ALTERNATE LISTED)
CR202-205
(ALTERNATE FOR
P/N 31-1N*001)
R501

C518
C521-523
C503,507 ,511,515

C501,502,50*-506,

508-510,512-519

Z502

Z505-512

Z501

Z503,50*

A501

A503-512

A502

L501

R*0*

R*02

R*03

R*01

A*02

A*03

C*07,*09

C*08,*1Q

C*02

C*0*,*11

C*01,*03,*05,*G6

Z*03

Z*02

L*01-*03

Z*02,*03

Z*01

A*01-*03

A*01

Z*01

ATARI Home Computer

9-12

ATARI 800 COMPUTER CONSOLE PARTS UST

PARTS LIST (cont)

Assy

Part No.

Oescriotion

TOP

CA01*115

TOP COVER ASSY

TOP

*C012947

TOP COVER

TOP

■• CO12970

LATCH

TOP

-C012971

ACTUATOR

TOP

CO 12991

LENS

TOP

C01*170

SPRING LATCH

Location

ATARI Home Computer

9-13

SECTION 10
SERVICE BULLETINS

This section is to be used by you to file the three classifications of service bulletins
which are periodically released by the Consumer "Product Service, Manager of
Technical Support.

The following are brief descriptions of each classification:
FIELD CHANGE ORDER

A Field Change Order describes hardware or software changes to ATARI Computer
products and instructs how to implement these changes.

To indicate your required action, a Field Change Order is issued in one of the following
two categories:

MANDATORY - This identifies a failure mode which affects reliability and
describes a proceflure to correct the failure. This procedure must be performed
on all units serviced or repaired.

AS FAILS - This identifies a failure mode which affects reliability and describes
a procedure to correct the failure mode. This procedure must be performed on
on an as fails basis.

UPGRADE BULLETIN

An Upgrade Bulletin describes product improvements or modifications which the
consumer may wish to purchase. These Bulletins allow you to modify the customer's
unit to add capabiUties which may not have been available when the unit was oriflinaUy
manufactured.

TECH TIP

A Tech Tip is a document of a general nature which transmits routine service or repair
information. By communicating methods developed since you attended training
classes. Tech Tips aid to continuously improve repair skills and increase knowledge of
ATARI Computer Products.

Other times, Tech Tips alert you to units which have been modified and are now
standard from ATARI Manufacturing, but are different from many existing units and
require different repair techniques.

ATARI Home Computer lO-l

ATARI

Consumer Product Service
Manager of TehnicaJ Support

UPGRADE BULLETIN

number

mooelj atari *oo/xoo computers

QATEs

May 2a, 1982

SUBJECT;

GTIA Chip

CHANGE DESCRIPTION:

New units manufactured by Atari contain the Ck-aphic Teievision Interface Adapt
(GTIA) chip on the CPU printed circuit board. The GTIA chip is an enhancement of
the Color Television Interface Adapter (CTIA) chip and may be purchased as an
upgrade to existing units.

Part Location - CPU printed circuit board location A301.

INSTALLATI ON PBorFnirPFS,

For troubieshooting, instaUation, and testing, observe warnings or cautions
stated in Atari Home Computer Division MO/800 Home Computer System Field
Service ManuaL Before a chip or board is added to or removed from the system,
power the system down.

Follow disassembly instructions in *00/800 Field Service ManuaL

Remove C012295 from location A30I on CPU printed circuit board.

Install CO 1*805 in location A301 on CPU printed circuit board.

TESTING PROCEDURES;

Follow standard Test Procedures using Atari Stand Alone Ttst (Diagnostic) as outlined
in Atari WO/800 Computer System Service ManuaL

CONSUMER INFORMATIONS

The GTIA chip adds three graphics modes accessible with BASIC for a total of eleven
different graphics modes in BASIC and 256 different colors.

The GTIA chip is fully compatible with software written to run on existing CTIA units.
Software which is written to run on the GTIA chip using its enhanced features is not
displayed correctly with CTIA units.

Jjl Consumer Product Servica

^1 rjj Manager of Tehnicai Support

ATARI UPGRADE BULLETIN

number

MOOELi ATARI MO/800 COMPUTERS

DATEj

PARTS DgPOSmON;
Not Applicable

ENCLOSURES;
CPU Silk Screen

e»' ■

socs

oca

nzizdzji

CIC

(OS*I

onn*

lOST

o •

son
wot

90G)I

1""

itU

CPU

CPU Board Silkscreen

ATARI

Consumer Product Service
Manager of TehnicaJ Support

TECH TIP

number

MOOEL; Atari MO/800 Computers

DATE:

May 2S, 1982

SUBaECT:

Revision B, Operating System ROMS.

DESCRIPTIONS

New Atari WO/800 computers contain Revision B ROMs — a refined version of an
Operating System ROM, which has a different checksum from Revision A ROMs.
When repiacing these components, do not mix revision leveia. System will not operate
if Revision A is paired with Revision B.

Parts:

Old ROMS: Cai2W9A and C0U599A
Rev B ROMS: C012W9B and C0U599B

Part Locations

*00 Computer System - Motherboard location
A103 (C014599) and AlO* (C012W9)

800 Computer System - Personality Board Location
AW1.(C01*599) and A403 (C012'J99).

You can recognize the new part in this manner:

TROUBLESHOOTING AND MAINTENANCE PROCEDURESs

For troubleshooting, maintenance and testing, observe warnings and cautions stated in
Atari *00/8CO Home Computer System Service Manual. Before a component or board
IS added to or removed from the system, power the system down.

If ROM chips are defective or if printer overprints (hiccups), replace ROM chips.

ATARI

Consumer Product Service
Manacjer of Tehnicai Support

TECH TIP number

MODEL: Atari 400/800 Computers

DATE:

WO Computer

Follow WO computer disassembly instructions in *00/800 Home Computer
System Service Manual to access motherboard.

Remove ROM chips located at A103 (COU599A) and AlO* (COlZ'fggA).

Replace COU599A and COI2W9A with A103 (COU599B) and A104
(CO 12*99B)-

FoUow reassembly instructions in ^^00/800 Home Computer System Service
Manual.

800 Computer

Follow 800 computer disassembly instructions in *00/800 Home Computer
System Service Manual Section to access ROM module.

Remove ROM chips located at A401 (COU599A) and A403 (C0^2'^99A) on
ROM module.

Replace C0U599A and C0l2t^99A with AWl (C0U599B) and A403
(C012499).

Follow reassembly instructions in your 400/800 Home Computer System
Service Manual under ROM Module Installation.

TESTING PROCEDURES:

Follow standard test procedures using Atari Stand Alone Test (Diagnostic) as outlined
in Atari 400/800 Computer System Service Manual.

ENCLOSURE:

1. 400 Motherboard, placement

2. 800 Personality Board, placement

O I - I- I 1C191 (3/a31

1.3

J110

— -

<3-

f d^'

J109

i^^^

. /

-K

«^"

, •■

1 ir ™

-1—

j-i *

•

is 4

UJ iST

3 > » • 2 -C=Ij,

a ' 3 3 3 3

o
o

itOO Motherboard Siikscreen

ZOfrO

aofro

-i

60fr3

izOi^l

rcofri

01^3

0^1 sofry

20^0

OtrO

c>a

ZOfrU

"800 Personality Board Silkscreen

ATARI

Consumer Product Service
Manager of Tehnical Support

TECH TIP

number

HCD

MODEL:

unn/Rna rnmp„i->.r

DATE:

02/22/83

SUBJECT;

Atari *00/800 System Lock-up

DESCRIPTION;

When the Atari ^^00/800 computer systems experiences intermittent lock-up, there is
no response from the keyboard and control of the computer is gone.

Probable Causes (in order of likelihood)

1. User is editing BASIC programs at time of lock-up

2. User is running user written software that contains errors

3- User is running third party software (non-Atari) that contains errors
4. Hardware failure
Troubleshooting

Ask your customer the following questions, and use the responses given to determine if
the problem is hardware or software oriented:

1. Does the unit bckup randomly only when editing statements in your ATARI
BASIC programs?

YES - The lockiip is caused by an anomaly in the ATARI BASIC cartridge.
The lockup condition is cleared by recycling the power switch OFF/ON.
This will clear the program from your unit's memory and any editing
completed since the last SAVE will be lost. Atari recommends saving
programs being edited every 15 minutes to minimize consternation should a
lockup occur.

2. Does the unit lockup consistently only when executing certain BASIC
programs?

YES - The lockup could be caused by logic errors in the program. The most
common error is invalid machine code called from a USR function in
BASIC.

3. Does the unit lockup only when loading or executing third party software?

YES - The lockup could be caused by the configuration not meeting
minimum requirements for memory or peripherals, or by errors in the
third-party software.

A Consumer Product Service

3 Manager of Tehnlcal Support HGD

A™' TECH TIP number 10

MODEL:

i^OO/800 Computer

DATEi 02/22/83

If intermittent lockups occur in a variety of operating situations the unit should be
checked for hardware failure in one of three areas.

o Dirty contacts or corrosion of edge connectors.

o Heat related failure of components particularly the 6502 MPU,

Outright failure of components.

If the problem appears to be user written software, refer your customer to the Product
Support Hot Line for programming assistance.

800-672-140* Inside California
800-538-85if3 Outside California

If the problem appears to be third party software oriented, refer your customer to the
retail outlet where it was purchased, or to the manufacturer of the software.

If you cannot determine from your customer's answers whether the problem is
software or hardware oriented, bum-in the unit for at least 12 hours using continuous
RAM Test of the SALT 2.05 Test Cartridge. At the end of the bum-in period, press
the SYSTEM RESET control key six times- Watch the screen after each press to see
that the POWER-UP screen correctly appears. If the screen does not come up
correctly - there is definitely a component failure occuring. Use the disassembly
procedures outlined in the Atari WOTM/gooTM Computer Field Service Manual
(FDlOOOOi) to disassemble the unit.

1. Check for frayed and/or broken wires; JU* Motherboard to 3202 of the
Power Supply Board. Check that connectors are clean and securely attached
between the Power Supply and Motherboard, and where the ROM/RAMs and
CPU plug into the Motherboard- When checking the above look for cold
solder joints.

2. Replace the 6502 (CPU) (Part # C01i^377) to eUminate this component as
possible failure.

3. Insert a Star Raider cartridge, Power -Up the system and continue testing.

4. If no failure occurs and everything checks OK then retum computer to
customer.

If computer is returned and is still failing, check the following additional ICs:

Replace Part Number

ANTIC C012296

GTIA C0lf*805

Multiplexers (Vendor & Date Codes must match) C0U3^5

(On 8 and 16K (2503 and

RAM boards) Z50^)

ATARI

Consumer Product Service
Manager of Tehnical Support

TECH TIP

number

HCD

MODEL:

t^OO/800 Computer

DATE: 02/22/83

If the POWER-UP screen appears correctly after all six SYSTEM RESET control key
pressed, return the unit to the customer with NO TROUBLE FOUND.

Trouble Reporting

If you have any questions concerning this Tech Tip, call your Atari Tech Line
Specialists:

Inside California
(800) 672-1466

Outside California
(800) 538-2535

1C1» (3/U)

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Complete Parts List
Troubleshooting
Specifications
Diagnostic Testing
Disassembly /Assembly

Mechanical Theory
Electronic Theory
Packed with technical

information

This comprehensive book provides complete technical information
for the 1050 Disk Drive and will prove to be an invaluable
reference even if the drive never needs repair. Sixty pages in
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Price: $19.50 each plus $2.00 shipping

Quantity Pricing :
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To Order :

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or send check or money order to:

Electronic Dimensions
Post Office Box 1846
San Luis Obispo, CA 93406
U.S.A.

Atari

M! New Edition ATARI 800XL SERVICE MANUAL On Sale Now !!

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Complete Parts List

Mechanical Theory

Electrical Theory

Pin Assignments

Interface Data

Testing

Diagnostic and Repair Procedures

Disassembly/Assembly

Lots of Technical Information

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DEALERS WELCOME

Price:

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