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Opto Trough Bad Check Connectors, Wires and 12V Supply
This message will be displayed if all of the optics in the playfield ball trough are not functioning.
This is usually caused by a problem with a ball trough connector supplying 12V and Ground for
the optical circuits.
Pinball Missing.
This game normally uses 4 balls; however, it will operate with as few as one ball. This message
announces that a ball is missing or stuck. When the ball is located, return it to the game via the
Outhole. Other possibilities for this problem could be malfunctions of the Ball Trough optos or the
Ball Shooter switch.
xxxxx Sw. is Stuck On.
This message indicates that a switch, which is not usually On, remains in the On position after the
game is switched On. The stuck switch is essential for game play (for example, a coin chute
switch, the slam tilt switch, the plumb bob tilt switch), and should be cleared to permit proper
game operation.
Ground Short Row-N, Wht-xxx.
This message indicates that the switch wires being called out are touching a grounded part on the
playfield or coin door. The following should be checked:
1. Slam Tilt (or other coin door) switch touching the grounded coin door.
2. A leaf-type, playfield switch touching a grounded part.
3. Players poking metallic objects (wires, coat hanger, etc.) into the game.
4. Switch cable insulation pierced or damaged allowing bare wire contact with a grounded part.
5. All switches in a row closing at the same time. Note: This instance is NOT a switch problem;
however, for most games this is a very rare possibility.
U6 Checksum Error.
The game ROM checksum is invalid. If this occurs replace the game ROM.
Time and Date Not Set.
The real time clock is not set. If this occurs go to U.4 of the Utilities Menu and set the time and
date.
Factory Settings Restored.
This message indicates that the CMOS RAM no longer retains any custom Pricing or Game
Adjustment settings and has reverted to factory default settings. Generally, the following CPU
checks will isolate the cause of the CMOS RAM memory failure. The voltage at pin 28 and pin 26
of U8 should be +5V (game turned On) and at least +4V (game turned Off). When the voltage
drops below +4 V, memory reset occurs. Check the batteries and battery holder. Be sure that the
batteries are good and that there is no contamination on the battery holder terminals. Turn the
game OFF, and use an ohmmeter to check diodes 01 and 02 on the CPU Board. 01 should read
o
ohms when forward-biased and infinite ohms when reverse-biased.
02 should read 15 ohms
when forward-biased and infinite ohms when reverse-biased.
Note: Readings taken from Analog
Meter. This message can also indicate that there is an open diode on a 50V coil circuit and noise
is entering the circuit.
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