Ccontrol panel access

Prior to replacing either flipper switch or the nudge switch, either flipper button, the LFD start switch, the loudspeaker, or any parts of the ball shooter, follow this procedure to gain access to the control panel interior.

1 Remove the screw located at each end of the control panel cover.

2. With slightly moist hands, slide the metal cover towards you about one inch Lift it up and remove As an alternate method of removal, you may insert the tip of a screwdriver into either hole, and pull the tool towards you.

Flipper and Nudge Switch Replacement

All three of these leaf switches operate on 5 volts at a very low current. Therefore, pitting of these switches would be extremely rare. Probably the only reason that pitting would occur is in very high humidity locations.

Don't burnish the switches. Burnishing them removes their plating, thus increasing the corrosion of the contacts. The best method of cleaning the switch contacts is to wipe them with u non-abrasive surface. A business card works great.

To replace any switch. remove both of its screws with a flat head screwdriver. See Figure 3-1. (Note: The right flipper switch cannot be removed until you first remove the ball shooter assembly See Figure 3-4 for instructions.)

If the white flipper button itself needs to be replaced, turn the Palnut with a wrench in a counter-clockwise direction, as seen from the inside of the control panel. The white ring on the outside of the control panel should not spin, due to its design.

LED Start Switch Replacement

The LED switch on the front of the control panel has a very low failure rate. In case the switch should ever be suspect, first test it. To test the switch perform the following steps:

1. Remove the wires from the suspected switch.

2. Set multimeter to ohtns scale.

3. Set ohms scale to R x 1. then zero the meter

4. Connect multimeter leads to appropriate LED switch contacts. (See Figure 3-2 for designation of switch contacts and meter lead placement.)

Check contacts (push and release the switch button) for closed and open continuity.

If the contacts do not operate sharply or always remain closed or open, then replace the LED switch as outlined in Figure 3-2.

Speaker Replacement

If the loudspeaker should ever need to be replaced, removal is very simple. Follow the instructions given in Figure 3-3 Probably the only cause of speaker failure is art electrical short or a ruptured cone, but both of these failure modes are highly unlikely.

NORMALLY CLOSEO (N.C.) CONTACTS

NORMALLY CLOSEO (N.C.) CONTACTS

LICHT EMITTING OIOOE (L E O.) CONTACTS

NOHMALLY OPEN (N O.) CONTACTS

LICHT EMITTING OIOOE (L E O.) CONTACTS

NOHMALLY OPEN (N O.) CONTACTS

OOUBLE-POLE SINGLE-THROW (DPST) SWITCH WITH INTERNAL LED

♦ Remove alt wires t'om the suspected switch.

• Turn the switch counterclockwise white holding the cone-shaped nut on the outside of the game cabinet.

* Install a new switch using the reverse procedure.

• Reconnect the harness wires.

Figure 3-2 LED Start Switch Replacement

1. Unplug both speaker wire connectors.

2. Remove 4 Phillips-head screws.

3. Replace speaker. (Metal griil remains fixed in place.)

Ball Shooter Maintenance and Repair

Three areas of the ball shooter assembly would possibly need attention: the long metal shaft, the two springs on this shaft, and the optical sensing PCB. Only the shaft needs regular maintenance: lubricate it regularly with a small amount of silicon grease. (For details see Figure 3-4.)

To replace any of these three parts that are faulty, follow the removal instructions given in Figure 3-4. When reinstalling the whole ball shooter assembly, mofce certain that the ground strap and the ground wire are secured to one of the threaded studs on the cover plate. The braided ground strap touches an unpainted portion of the metal control panel cover and is designed to protect players from electrical shock caused by an accidental short circuit in the game

Lubricate the shaft regularly with silicon grease.

Atari part no. 78-1708.

To replace ball shooter assembly:

1. Unplug Molex connector on optical sensing PCB.

2. Remove hex nuts and lock washers on all tour threaded studs inside the ball shootet cover plate.

3. Pull oil cover plate completely. Slide ball shooter part way into square rear access hole In control panel. Then tilt assembly upwards and lilt out.

1. You can now replace the ball shooter shaft, the optical sensing PCB, or either ol the springs on the shaft. Note that two different size springs are used.

5. When replacing the ball shooter assembly, be sure 1o also reattach the green ground wire and the braided metal ground strap to one o< the threaded studs.

To replace optical sensing PCB:

1. Remove both screws, spacers, and washer sets that hold down the PCB.

2. Remove the printed circuit board. When re installing a new optical sensing PCB, be sure to carefully align it so that the black "flag" passes between the red sensor's two halves.

d. white fluorescent light replacement

To replace the white fluorescent lube behind the attraction shield, follow this procedure (see Figure 3-5 below):

1. Remove the two Allen-head screws at the top of the game. They secure the metal retainer for the silk-screened shield. Remove the retainer strip completely

2. Tilt the top of the Plexiglas shield towards you. then lift it up and out of the bottom retainer strip.

3. Now turn the fluorescent tube one quarter turn in either direction Remove and replace with a new tube. Close up the game by following these instructions In reverse order.

e. playfield pcb repair

Figure 3-6 describes the procedure for repairing this board, namely replacing individual light-emilting diodes. Although LEDs have an extremely long life expectancy once burned in. it may still be necessary to replace some of them.

However, if several LEDs "burn out" at once, check to see if they fall into any special grouping The schematic in Figure 4-16 shows that if several LEDs are out, the cathode or anode drivers on the game PCB could be faulty. Six or eight LEDs out generally means one of the cathode drivers is bad: three or four LEDs burned out may mean a bad anode driver.

1. Remova Plexiglas' shield.

2. Disconnect the connector in the center ol the PCB. Carefully lift up the board out of the holes In the playfield. You will be removing the board by pulling apart the four "hook and loop" fasteners.

3. Unsolder any burned out LEDs (light-emitting diodes) and replace them with new ones.

4. Replace the PCB by aligning the red light-emilting diodes in their appropriate holes. Press down gently on the lour fastener areas.

5. Reconnect the PCB connector. Make sure the blank position in it (appears as a "missing" wire) is at the right end ol the connector.

6. Replace the Plexiglas shield and Its retainer strip.

Plexiglas' is a registered trademark of Bottm and Haas

Company.

Figure 3-6 Playfield PCB Replacement

1. Remova Plexiglas' shield.

2. Disconnect the connector in the center ol the PCB. Carefully lift up the board out of the holes In the playfield. You will be removing the board by pulling apart the four "hook and loop" fasteners.

3. Unsolder any burned out LEDs (light-emitting diodes) and replace them with new ones.

4. Replace the PCB by aligning the red light-emilting diodes in their appropriate holes. Press down gently on the lour fastener areas.

5. Reconnect the PCB connector. Make sure the blank position in it (appears as a "missing" wire) is at the right end ol the connector.

6. Replace the Plexiglas shield and Its retainer strip.

Plexiglas' is a registered trademark of Bottm and Haas

Company.

Figure 3-6 Playfield PCB Replacement f. blacklight replacement

If the blacklight tube burns out, replace it with the same length of tube Follow the replacement procedure given in Figure 3-5 Fluorescent Light Replacement Figure 3 7

1. Remove the rear access door to the game. Bend up flap of playfleld cardboard at the perioral ion. You do not need to remove staples from the cardboard.

2. Turn the blackttght tube 'A turn towards or away from you. LHt it up slightly, and then out.

3. Replace with a new blackllgnt tube of the same rating and length.

4. Close the rear access door to the game.

1. Remove the rear access door to the game. Bend up flap of playfleld cardboard at the perioral ion. You do not need to remove staples from the cardboard.

2. Turn the blackttght tube 'A turn towards or away from you. LHt it up slightly, and then out.

3. Replace with a new blackllgnt tube of the same rating and length.

4. Close the rear access door to the game.

Figure 3-7 Blacklight Replacement g. tv monitor removal

If the television monitor is faulty in any way, you wilt need to remove it for servicing Follow the procedure given in Figure 3 8. The monitor can then be set on a test bench for much easier access.

Note that the usual picture adjustments can still be done with the TV installed. Reler to the Wells-Gardner service manual that came with your game for complete details on adjustments and servicing of this monitor.

h. nudge spring replacement

Tools required: 5/16" nut driver or socket wrench (ratchet-type) 5/32" Allen wrench

1. Remove the front Plexiglas shield by first removing the metal retainer strip at the top of the game.

2. Remove the silk-screened cover on the control panel.

3. Remove the blacklight fixture at the back of the game. Shove the half-silvered mirror backwards about 6 inches

ot 23" TV monitor is used exclusively.

1. Remove rear access door. Remove the 2 screws from the rear.

2. Open ihe coin door. Remove this screw by reaching through the coin door.

ot 23" TV monitor is used exclusively.

1. Remove rear access door. Remove the 2 screws from the rear.

2. Open ihe coin door. Remove this screw by reaching through the coin door.

3. Disconnect the Mo lex connector on the rear of the TV chassis. Then disconnect the connectors on the main harness and the blackllght harness.

4. Carefully slide out the monitor, making sure not to touch the yoke area. High voffages present at »he rear of the tube can be fatal. Replace the monitor by following instructions in reverse otder.

Figure 3-8 TV Monitor Removal

4. Disconnect the white Molex connector behind and slightly below the control panel.

5. Now remove the nuts and washers Irom the 3 hex-socket shoulder screws at the bottom back of the control panel. The nuts on these 3 screws should be the first thing off, and the first on The nudge springs are on these shoulder screws.

6. Remove the top 4 carriage bolts and nuts, while supporting the control panel with your hip.

7 When replacing the control panel, thread the Molex connector through the small rectangular hole Be sure the harness wires are not trapped on either a carriage bolt or shoulder screw next to the hole Install all seven nuts and washers. Tighten the carriage bolts first, then the shoulder screws. Be sure nudge switch can be activated and is not closed when control panel is at rest. When done, the control panel and front of the game should be parallel.

The following information provides a detailed description of the game PCB With this information we provide block diagrams of many of the circuits. In the block diagrams we have, for the most part, used the same blocks in which we divided the schematic diagrams. We hope that this will aid you in identifying the actual functions of the circuitry

Power Supply

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Com Door iv AX iw»TcH

Figure 4-1 (Continued) Game Power Distribution and Wiring Diagram 007197-01 C / 030401-01 B

a. game pcb power distribution

See Figure 4-1 for information dealing with the wiring of the game, the power supply schematic and coin door schematic. See Figure 4-2 for power distribution information on the game PCB.

The game PCB receives unregulated + 10 VDC from the game Power Supply and develops a +5 VDC regulated voltage at the output of voltage regulator LM323. The regulated voltage is used for all logic V„ on the game PCB and optical sensing or steering PCB, excluding the game PCB's audio amplifier. The audio amplifier's V,,. is from the filtered + 18 VDC.

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Figure 4-2 Game PCB Power Distribution Schematic Diagram (Part of Game PCB 030845-XX A)

h SYNC GATING ANO FLIP-FLOPS E4. K5

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