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Factory Settings Restored.
This message indicates that the CMOS RAM (U8) 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 U8
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 01 and 02 on the CPU Board.
01 should read 0 ohms when
forward-biased and infinite ohms when reverse-biased.
02 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.D.'s
The CPU has three L.E.O.s located on the upper left side of the board 019, 020, and 021. On
game power-up 019 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.D. Error Codes
Center L.E.O. blinks one time
Center L.E.O. 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
US Failure
U6 Failure
U7 Failure
U8 Failure
U9 Failure
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Opto Theory
The opto receiver (Photo Transistor) should be approximately 0.1 - 0.7 volts when the opto beam is
unblocked and approximately 11 - 13 volts when the opto beam is blocked. The opto transmitter
(LED) should always be approximately 1.4 volts.
Note:
The transmitter (LED) is larger than the
receiver (Photo Transistor); it protrudes further from its case.
LED Board
Photo Transistor Board
Transmitter
Receiver
1.0-1.1 Volts
0.1-0.7V Unblocked
11-13V Blocked
WHT
BLK
Blue
W
I
Infrared Ray
-
Gray-XXX
Black
Gray-Yellow
Orange-XXX
1-42