WEBVTT Kind: captions; Language: en 00:00:00.000 --> 00:00:13.000 [...] 00:00:42.001 --> 00:00:47.001 Music The regular care and proper operation of any piece of fine machinery is the 00:00:47.001 --> 00:00:51.001 one way to prevent malfunction and possible damage to its components. 00:00:54.001 --> 00:01:00.000 The AQ2A is a fine piece of electronic mechanical equipment. Its precision parts 00:01:00.000 --> 00:01:03.000 have been machined to the close tolerances of a fine watch. 00:01:03.001 --> 00:01:07.001 Yet, with the kind of ordinary care you will see demonstrated, this projector 00:01:07.001 --> 00:01:10.001 should give many years of highly satisfactory service. 00:01:13.000 --> 00:01:17.001 Basically, all motion picture projectors operate the same way and require the 00:01:17.001 --> 00:01:22.001 same care. But for this demonstration, we shall use motion picture projector 00:01:22.001 --> 00:01:24.000 AQ2A1. 00:01:25.000 --> 00:01:29.000 When you receive an order or request to screen a certain film, check the 00:01:29.000 --> 00:01:33.000 screening room to ascertain what adjustments are necessary for good viewing. 00:01:33.001 --> 00:01:39.001 First, the room should be well ventilated. Generally, this room will be a dual 00:01:39.001 --> 00:01:42.001 purpose classroom and will need some rearrangement 00:01:42.001 --> 00:01:44.000 to adapt it to a screening room. 00:01:45.000 --> 00:01:49.000 These windows will have to be blacked out. Any outside light will 00:01:49.000 --> 00:01:51.000 cause poor projection quality. 00:01:56.001 --> 00:02:01.000 Seats should be placed at an angle for better viewing for everyone. 00:02:06.000 --> 00:02:11.001 Position the projector at least six feet from the rear row of seats and make sure 00:02:11.001 --> 00:02:15.000 the stand is stable to prevent tipping or rolling 00:02:15.000 --> 00:02:16.001 after the projector is in position. 00:02:20.000 --> 00:02:25.000 The projection stand must be of such height that the projection light beam is 00:02:25.000 --> 00:02:26.001 at least four feet from the floor. 00:02:30.000 --> 00:02:32.000 Now, set up the viewing screen. 00:02:40.001 --> 00:02:46.000 There are two simple rules to follow when placing this screen. First, place the 00:02:46.000 --> 00:02:49.001 screen at least two screen widths in front of the first row of seats. 00:03:05.000 --> 00:03:09.000 And second, put the bottom of the screen at least as high as the heads of the 00:03:09.000 --> 00:03:10.001 viewers when they are seated. 00:03:11.001 --> 00:03:16.000 Now the room is set, the screen is set, so you can start the preoperative 00:03:16.000 --> 00:03:18.000 and setup check of the projector. 00:03:19.000 --> 00:03:23.000 First, make sure you have a full assortment of replacement parts, including 00:03:23.000 --> 00:03:29.001 aperture brush and spare belts, lens tissue, exciter lamp, lubrication oil having 00:03:29.001 --> 00:03:35.001 military symbol 2135H, fuses, projection lamp, and a small 00:03:35.001 --> 00:03:37.000 bottle of pure grain alcohol. 00:03:41.000 --> 00:03:48.000 Now, attach the real arms to the projector in the manner shown. Make sure the arm 00:03:48.000 --> 00:03:50.001 with the rewind mechanism goes in the front position. 00:03:53.001 --> 00:03:57.000 Keep the pulley wheels toward you and you will have these arms properly 00:03:57.000 --> 00:04:02.000 installed. The belts roll easily onto the pulleys. Make sure the 00:04:02.000 --> 00:04:04.000 rewind plunger is disengaged. 00:04:09.000 --> 00:04:13.000 The rear take-up arm is installed in the same manner. 00:04:23.001 --> 00:04:29.001 Before you plug the projector in, check that all switches are turned off. Motor 00:04:29.001 --> 00:04:33.001 switches and amplifier controls are located on the back of the projector. 00:04:45.000 --> 00:04:51.000 The external loudspeaker receptacle, loudspeaker selector switch, and the AC 00:04:51.000 --> 00:04:54.000 power receptacle are located on the front of the projector. 00:05:01.001 --> 00:05:05.001 Plug the loudspeaker cable into the receptacle located on the bottom right side 00:05:05.001 --> 00:05:09.001 of the projector. Make sure the speaker selector switch is in remote. 00:05:10.001 --> 00:05:15.000 Always secure cables and wires to prevent the possibility of someone tripping on 00:05:15.000 --> 00:05:18.000 them, causing personal injury and damaging the equipment. 00:05:21.001 --> 00:05:28.000 It is a good idea to keep handy an AC power extension to reach the outlet. When 00:05:28.000 --> 00:05:33.001 necessary to use one, loop the two ends together before connecting them. This 00:05:33.001 --> 00:05:35.000 keeps the strain off the connection. 00:05:38.000 --> 00:05:42.001 Before connecting this power cable to the projector, tie it to something solid. 00:05:43.000 --> 00:05:46.000 This will prevent a direct pull on the projector in case 00:05:46.000 --> 00:05:48.000 someone should trip on the wire. 00:05:50.000 --> 00:05:54.000 Make sure the AC line locks into the receptacle on the projector. 00:06:00.000 --> 00:06:05.000 Before plugging in the power line, attach the ground wire to the receptacle. This 00:06:05.000 --> 00:06:07.001 will eliminate the possibility of dangerous shock. 00:06:09.001 --> 00:06:14.001 Now you're ready to test the projector and make the preoperative checks. Flip the 00:06:14.001 --> 00:06:19.000 power switch to the on position. This supplies power to both the projector 00:06:19.000 --> 00:06:21.000 and to the loudspeaker. 00:06:21.000 --> 00:06:25.001 Turn the volume control to the right to about midway in its range, and as the 00:06:25.001 --> 00:06:29.001 projector warms up, you should hear a hissing sound coming out of the speaker. 00:06:31.000 --> 00:06:34.001 Before going any further, let's see how the audio system works. 00:06:36.000 --> 00:06:39.001 This is the sound optical system that synchronizes and 00:06:39.001 --> 00:06:41.000 projects the sound with the picture. 00:06:42.000 --> 00:06:47.000 The exciter lamp projects the light through this sound lens system. This lens 00:06:47.000 --> 00:06:50.001 focuses a beam of light on the soundtrack at the edge of the film. 00:06:51.000 --> 00:06:55.001 Should the exciter lamp burn out, turn the locking ring to the right, then turn 00:06:55.001 --> 00:06:57.001 the bulb itself to the right and remove. 00:06:58.001 --> 00:07:03.000 When replacing the bulb, turn it to the left, thus locking it on the registration 00:07:03.000 --> 00:07:07.001 pins. Then turn the locking ring to the left, then replace the housing. 00:07:08.000 --> 00:07:13.000 As a further test of the sound system, place a piece of cardboard between the 00:07:13.000 --> 00:07:16.001 sound lens and the sound drum. This sound indicates 00:07:16.001 --> 00:07:18.000 the system is working properly. 00:07:21.000 --> 00:07:24.001 This interrupts the light beam from the sound lens to the photocell. 00:07:26.001 --> 00:07:31.001 Place the loudspeaker on a stand near the projection screen. Never put the 00:07:31.001 --> 00:07:36.001 speaker on the floor. Loop the cable around the stand leg to take the strain off 00:07:36.001 --> 00:07:38.000 the connection on the speaker itself. 00:07:41.001 --> 00:07:45.000 With your sound system checked out and set up, you are ready 00:07:45.000 --> 00:07:47.000 to check and clean the projector. 00:07:49.001 --> 00:07:53.001 Remove the projection lamp cover. Take it all the way off the projector. 00:07:54.001 --> 00:07:57.001 Caution, be sure the power to the projector is turned off before 00:07:57.001 --> 00:07:59.001 removing any lamps from their sockets. 00:08:00.001 --> 00:08:05.000 To remove this lamp, push it down and turn one quarter turn to the left, then 00:08:05.000 --> 00:08:06.001 lift it from the registration pins. 00:08:08.000 --> 00:08:13.001 This is the projection lamp reflector, and this is the condensing lens. Both of 00:08:13.001 --> 00:08:16.000 these must be clean for sharp, brilliant pictures. 00:08:17.000 --> 00:08:21.001 Always use lens tissue to clean these using a gentle circular motion. 00:08:23.001 --> 00:08:27.001 If there are fingerprints, use a drop or two of alcohol as a cleaner. 00:08:31.000 --> 00:08:38.000 When the reflector and condensing lens are clean, replace the projection 00:08:38.000 --> 00:08:42.000 lamp with a quarter turn to the right, then wipe this clean too. 00:08:49.001 --> 00:08:53.000 Replace the lamp house cover on its hinges and snap it shut. 00:08:55.000 --> 00:08:56.001 Now clean the projection lens. 00:08:58.001 --> 00:09:04.001 First, loosen the locking screw and carefully remove the lens. Wipe this lens 00:09:04.001 --> 00:09:06.001 using a gentle circular motion also. 00:09:08.000 --> 00:09:11.001 If there are fingerprints or grease on it, use a drop or two of 00:09:11.001 --> 00:09:13.001 pure grain alcohol on the tissue. 00:09:14.001 --> 00:09:19.001 When it is clean, replace into housing and set the screw snugly. 00:09:21.001 --> 00:09:24.001 Finally, you must clean the aperture plate and the pressure plate. 00:09:25.001 --> 00:09:27.000 They are both located here. 00:09:28.000 --> 00:09:31.000 Caution, never attempt to remove either of these plates 00:09:31.000 --> 00:09:33.000 when the projector is running. 00:09:33.001 --> 00:09:37.001 To take these out, first open the film channel by pulling out the release knob 00:09:37.001 --> 00:09:40.001 here. Pull the pressure plate handle toward you. 00:09:41.000 --> 00:09:46.000 Any accumulation of dust, dirt, and emulsion must come off to avoid scratching or 00:09:46.000 --> 00:09:48.001 possible sticking and breaking of the film. 00:09:49.000 --> 00:09:52.001 Clean with the aperture brush, never with any metallic object. 00:09:54.000 --> 00:09:59.000 If there is gum on it, soften it with a little alcohol on a clean cloth. Then 00:09:59.000 --> 00:10:00.001 use the aperture brush again. 00:10:09.000 --> 00:10:12.000 Next, take out the aperture plate. Turn the 00:10:12.000 --> 00:10:14.000 threading knob to retract the shuttle. 00:10:14.001 --> 00:10:19.000 Grasp the aperture plate on top with your left hand. Pull up and lift out. 00:10:20.000 --> 00:10:24.000 Remember, these parts come out easily. Never force them. 00:10:24.000 --> 00:10:29.001 Here again, all traces of dirt must be removed as you did on the pressure plate. 00:10:30.000 --> 00:10:36.001 But to get in corners is a toothpick, stiff card, or a manicurist's orange stick. 00:10:37.000 --> 00:10:40.000 Never use anything metallic to clean these plates. 00:10:51.001 --> 00:10:56.001 When it is clean, place slots of the aperture plate over the studs on the 00:10:56.001 --> 00:11:01.001 mounting bracket, and then, and this is important, push it down all the way. 00:11:04.000 --> 00:11:08.000 When replacing the pressure plate, see that the clips top and bottom 00:11:08.000 --> 00:11:10.000 engage the mounting brackets. 00:11:11.000 --> 00:11:14.000 If this is done right, it slips right in. 00:11:15.001 --> 00:11:20.000 And that's about it. You have checked to make sure that you have sound, light, 00:11:20.001 --> 00:11:24.000 clean lens, clean aperture, and pressure plates, and all 00:11:24.000 --> 00:11:25.001 the replacement parts necessary. 00:11:27.000 --> 00:11:31.000 Now you are ready to check the projection light image on the screen. It is 00:11:31.000 --> 00:11:33.001 important to check this out before your audience arrives. 00:11:34.001 --> 00:11:40.000 Notice the light is high, tilted, and off-center. Center the image by moving the 00:11:40.000 --> 00:11:43.001 projector. To lower the image, turn the leveling knob 00:11:43.001 --> 00:11:45.000 on the lower front of the projector. 00:11:47.000 --> 00:11:51.001 To adjust the tilt, there is a leveling screw on the rear leg of the projector. 00:11:52.001 --> 00:11:54.001 Turn it to raise or lower the leg. 00:11:56.001 --> 00:11:59.000 Now the projection image is straight on the screen. 00:12:04.000 --> 00:12:09.001 You are ready now to put the film on the projector. 00:12:13.001 --> 00:12:19.000 But first, make sure the film is the right one, scheduled to be shown, and is on 00:12:19.000 --> 00:12:24.000 the reel, heads out. Unroll the film to the title, and hold it up to the light. 00:12:24.001 --> 00:12:27.001 You will be able to read the title right side up if the film 00:12:27.001 --> 00:12:29.000 has been rewound correctly. 00:12:33.001 --> 00:12:38.001 Then put the reel on the feed reel arm. Measure the take-up reel by comparing it 00:12:38.001 --> 00:12:41.001 with the feed reel to make sure they are the same size. 00:12:42.001 --> 00:12:46.001 If you are short of take-up reels, you can get them in the four sizes from your 00:12:46.001 --> 00:12:50.000 film library or order them from the Air Force Film Library Center. 00:12:51.000 --> 00:12:52.001 Now you are ready to thread the film. 00:12:54.000 --> 00:12:59.000 First, check the path the film will take. There are no 00:12:59.000 --> 00:13:01.000 shortcuts to the threading procedure. 00:13:02.000 --> 00:13:05.000 The course of the film must follow exactly the route as 00:13:05.000 --> 00:13:06.001 outlined on the projector case. 00:13:08.000 --> 00:13:12.001 More than 80% of all projector failures during a screening are the direct results 00:13:12.001 --> 00:13:14.001 of improper threading of the film. 00:13:16.001 --> 00:13:21.000 With about five feet of leader off the feed reel, run the film through the two 00:13:21.000 --> 00:13:23.001 film guide rollers at the top of the machine. 00:13:25.001 --> 00:13:29.001 Lower the film feed sprocket shoe and place the film under the sprocket, making 00:13:29.001 --> 00:13:32.001 sure the perforations engage the sprocket teeth. 00:13:34.000 --> 00:13:37.000 Then close the shoe to lock the film in place. 00:13:40.000 --> 00:13:44.000 Now turn the threading knob until the words on it read horizontally. 00:13:45.001 --> 00:13:48.000 Pull out the pressure release knob to open the film channel. 00:13:49.000 --> 00:13:53.000 Thread the film through, leaving a loop the size indicated on the chassis. 00:13:53.001 --> 00:13:57.001 Be sure the film is flat against the aperture plate and the teeth are engaged. 00:13:58.000 --> 00:13:59.001 Then snap the pressure plate in place. 00:14:01.000 --> 00:14:04.000 Turn the threading knob several times to ensure the proper loop. 00:14:04.001 --> 00:14:09.001 If the loop does not snap back into position, rethread through the film gate. 00:14:11.000 --> 00:14:13.001 Now run the film under the guide roller, leaving a small 00:14:13.001 --> 00:14:15.001 loop, then through the sound sprocket. 00:14:16.001 --> 00:14:20.001 Check the loop size by pressing and quickly releasing the loop setter button. 00:14:21.001 --> 00:14:24.000 This loop ensures proper sound picture synchronization. 00:14:25.001 --> 00:14:29.001 Now put the film under the upper idler roller and over the sound drum. 00:14:29.001 --> 00:14:33.000 Run the film under the lower idler roller and over the sprocket. 00:14:33.001 --> 00:14:38.000 But before engaging the teeth in the sprocket holes, pull the film taut, then 00:14:38.000 --> 00:14:42.001 back off about half a frame to engage the sprocket teeth, then close the shoe. 00:14:43.001 --> 00:14:48.000 Now thread around the floating idlers on the right, across the bottom, under and 00:14:48.000 --> 00:14:52.001 around the lower roller, then to the right of the upper one, and through the top 00:14:52.001 --> 00:14:55.000 rollers to the left side of the take-up reel. 00:14:56.000 --> 00:15:00.001 Put the end securely on the hub and turn the reel to take up the slack. 00:15:05.000 --> 00:15:11.001 More than 90% of all damage to the film occurs in the first 20 feet, 00:15:12.001 --> 00:15:14.001 and much of that is the result of improper threading 00:15:14.001 --> 00:15:16.000 of the film at the gate area. 00:15:17.001 --> 00:15:23.000 The film runs through this gate at 24 frames per second, and as each frame passes 00:15:23.000 --> 00:15:25.001 through, there is a slight hesitation of this frame, 00:15:26.000 --> 00:15:27.001 as it is flashed on the screen. 00:15:29.000 --> 00:15:34.001 To illustrate this action, the shuttle claw moves like a piston, engaging the 00:15:34.001 --> 00:15:38.000 film on the downstroke, releasing it at the bottom, and returning 00:15:38.000 --> 00:15:40.000 to the top for another frame. 00:15:40.000 --> 00:15:45.000 It is during this interval, as the shuttle claw moves from bottom to top, that 00:15:45.000 --> 00:15:47.001 the hesitation in film movement occurs, thus accounting 00:15:47.001 --> 00:15:49.000 for the stability of the picture. 00:15:50.000 --> 00:15:52.001 It's easy to see how a film could be chewed up if not 00:15:52.001 --> 00:15:54.000 properly threaded at this point. 00:15:57.000 --> 00:15:59.001 Proper threading is equally important here at the sound drum. 00:16:01.000 --> 00:16:05.001 To get exact synchronization of sound and picture, there are 26 frames of film 00:16:05.001 --> 00:16:08.000 between the picture aperture and the sound lens. 00:16:09.000 --> 00:16:13.000 To ensure this exactness when threading, be sure to press and 00:16:13.000 --> 00:16:14.001 quickly release the loop setter button. 00:16:16.000 --> 00:16:19.000 This sets the lower loop in the film gate area to exact size. 00:16:20.000 --> 00:16:23.000 Always remember to screen it right, thread it right. 00:16:23.001 --> 00:16:27.001 If any question arises as to the operation of the projector, check technical 00:16:27.001 --> 00:16:32.000 order 10D1-2-9-1. 00:16:34.001 --> 00:16:36.001 Now it's almost time for your show. 00:16:37.001 --> 00:16:41.000 So while the audience arrives, let's recap the main things to do 00:16:41.000 --> 00:16:42.001 in preparation for this moment. 00:16:45.000 --> 00:16:46.001 Check the room, get it ready. 00:16:48.001 --> 00:16:50.001 Check the projector and screen placement. 00:16:52.001 --> 00:16:54.000 Check for spares. 00:16:56.000 --> 00:16:57.000 Check for power. 00:16:59.001 --> 00:17:00.001 Check for sound. 00:17:02.001 --> 00:17:05.000 Check that the image is projected properly. 00:17:07.001 --> 00:17:08.000 Check the film. 00:17:11.000 --> 00:17:13.000 And last, check the film threading. 00:17:16.000 --> 00:17:19.000 You know you have done everything right, so you may rest assured 00:17:19.000 --> 00:17:20.001 this will be a good show. 00:17:24.000 --> 00:17:28.000 Suppose the film broke in the middle of a screening. 00:17:28.001 --> 00:17:31.001 Here's what to do to avoid too much annoyance to your audience. 00:17:32.001 --> 00:17:33.001 Turn off the projector. 00:17:34.000 --> 00:17:36.001 Keep calm and don't let the audience rattle you. 00:17:37.001 --> 00:17:40.000 Open the film gate to release the tension on the film. 00:17:40.001 --> 00:17:44.000 Flip open the three sprocket shoes and quickly but carefully remove 00:17:44.000 --> 00:17:45.001 the film from the sprockets. 00:17:48.000 --> 00:17:50.000 Wind the loose film onto the take-up reel. 00:17:51.000 --> 00:17:54.001 Lift the broken end of the film and place the new end under it. 00:18:02.000 --> 00:18:05.000 Turn the take-up reel to make sure the new end is snug. 00:18:05.001 --> 00:18:08.000 Then pull down the film from the feed reel, allowing 00:18:08.000 --> 00:18:10.000 yourself a little more than normal. 00:18:10.001 --> 00:18:12.000 Then start re-threading. 00:18:12.001 --> 00:18:17.001 Remember, this operation must be performed properly, so take your time. 00:18:20.001 --> 00:18:25.001 Never attempt to patch or fasten a broken film when a break happens, because you 00:18:25.001 --> 00:18:27.001 have already delayed the show long enough. 00:18:28.001 --> 00:18:33.000 You can splice the film after the show or send it back to the library after 00:18:33.000 --> 00:18:37.000 placing it in the proper can tails out with a note inside the can 00:18:37.000 --> 00:18:38.001 stating the film is broken. 00:18:42.000 --> 00:18:44.000 Now, suppose you lost a loop during a show. 00:18:44.001 --> 00:18:48.001 Without stopping the projector, try to bring the loop back by gently pulling 00:18:48.001 --> 00:18:50.000 on the loop with your index finger. 00:18:50.001 --> 00:18:54.001 If that doesn't work, adjust the film loop setter knob on the bottom loop. 00:18:55.000 --> 00:18:59.000 If that doesn't help at any, push the loop setter button on top of the machine. 00:19:01.000 --> 00:19:04.001 You have just completed a film showing, and as in the majority of 00:19:04.001 --> 00:19:07.000 screenings, it went along without trouble. 00:19:08.001 --> 00:19:10.000 Now, what do you do with the film? 00:19:11.001 --> 00:19:14.001 If it goes back to the library, don't rewind it. 00:19:15.000 --> 00:19:17.000 Just tape the tail end with masking tape. 00:19:18.000 --> 00:19:21.001 Never use adhesive tape as it leaves a sticky residue on the film that could 00:19:21.001 --> 00:19:23.001 seriously damage the projector. 00:19:24.000 --> 00:19:26.001 Replace the unwound film in the proper can. 00:19:29.001 --> 00:19:33.001 However, if you want to show it again, you rewind it immediately. 00:19:34.000 --> 00:19:37.000 Pass the end of the film under the rewind reel and 00:19:37.000 --> 00:19:39.000 insert it into the slot on the hub. 00:19:39.001 --> 00:19:41.001 Give it a turn or two to take up the slack. 00:19:42.001 --> 00:19:47.000 Now, engage the rewind plunger by pulling out on it, turning a quarter turn 00:19:47.000 --> 00:19:48.001 and letting it snap into place. 00:19:49.001 --> 00:19:52.000 Then, flip the rewind switch on the rear of the projector. 00:19:53.001 --> 00:19:57.001 Watch the film as it is rewinding to make sure that it goes on the reel properly 00:19:57.001 --> 00:19:59.001 and not on the floor if something were to happen. 00:20:02.001 --> 00:20:07.000 When the film is rewound, tape the leader with masking tape. 00:20:11.001 --> 00:20:16.001 Now, the rewound film is replaced in the proper can for later screening. 00:20:17.001 --> 00:20:20.000 Be sure to disengage the rewind plunger. 00:20:21.000 --> 00:20:25.000 Follow the procedures outlined in this film and you'll become the best 00:20:25.000 --> 00:20:27.000 projectionist in your organization.