Basic HTML Version
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
hangers, 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 is NOT a switch problem; however,
for most games it 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 Go to UA
of
the Utilities Menu and set the time and date.
Factory Settings Restored.
This message indicates that the CMOS
RAM (UB)
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 voltages at pin 28 and pin
26
of
US should be +5V (game turned On) and at least +4V (game turned Off). When the voltage
drops below +4V, 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 D1 and D2 on the CPU Board. D1 should
read
0
ohms when forward-biased and infinite ohms when reverse-biased.
D2 should read 15
ohms when forward-biased and infinite ohms when reverse-biased.
(Readings taken with an
analog meter.)This message can also indicate that there is an open diode on a 50V coil circuit
and noise is entering the circuit.
CPU l.E.O.'s
The CPU has three L.E.O.s located on the upper left side of the board D19, 020, and 021. On
game power-up D19 and 021 turn on for a moment then, 019 turns off and
020
starts to blink
rapidly. 021 remains on. The system has detected
a
problem if the following happens:
CPU Board L.E.O. Error Codes
Center L.E.O. blinks one time
Center L.E.D. blinks two times
Center L.E.O. blinks three times-
U6 ROM Failure
U8 RAM Failure
U9
Custom Chip Failure
Sound Board Beep Error Codes
Upon Game Turn-On:
1
Beep
2
Beeps
3
Beeps
4
Beeps
5 Beeps
6
Beeps
7
Beeps
8
Beeps
9
Beeps
= Sound Board O.K.
U2 Failure
U3
Failure
U4
Failure
U5
Failure
U6 Failure
U7
Failure
U8
Failure
U9
Failure
=
=
=
=
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