It Could Possibly Be The Fault From The Synchronizing Circuit Follow The Flow Chart Below For Inspection

a. WHEN GAME STARTS, PICTURE DISAPPEARS.

1 IS THE CHIP SELECT OF ROM FUNCTIONING PROPERLY? IS THE ADDRESS DATA BUS FUNCTIONING PROPERLY?

2 ARE THE OUTPUT POWER PIN 12, 13, 14, 15 OF IC 15 FUNCTIONING PROPERLY?

ARE THE INPUT POWER PIN 1, 2, 3, 4, 5, 6 OF IC 15 FUNCTIONING PROPERLY?

CHECK ESPECIALLY ON 6TH PIN OF IC 30 TO THE 4TH, 5TH PIN AS WELL.

3 BUFFER FOR ADDRESS BUS OF IC 3, 4, 14 FAULTY? ESPECIALLY, TOO MUCH FAULTY OF TEMPERATURE.

b. WHEN INSERTING COIN, IT RESETS.

1 IS THE CHIP SELECT (8 PIN) OF IC 19, 20, 21, 22 FUNCTIONING PROPERLY?

IS THE ADDRESS DATA BUS FUNCTIONING PROPERLY?

2 ARE THE INPUT POWER SIDE OF 1, 2, 3, 4, 5, 6 PIN OF IC 17 NORMAL? FOR 6 PIN, CHECK ALSO 4, 5 PIN OF IC 30.

3 BUFFER FOR ADDRESS BUS OF IC 3, 4, 14 FAULTY.

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