BOARD NO:     0041
GAME:         Time Scanner (on a System 16 B-type)
MANUFACTURER: Sega
DATE:         1987
HARNESS:      SEGA-S

SYMPTOM (06/09/96)
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No sound.

SOLUTION
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Digital noise from the speaker suggested the amplifier was running and this was confirmed with a pulse injector applied to the pins of the Yamaha audio chip. Using a scope to look at the address and data buses at the sound EPROMS (A7 & A8) indicated the sound processor was running but not responding to the game. Using a pulse injector on the data bus caused brief noise bites but nothing much else. The game uses a standard Z80 on sound, and replacing it fixed the sound completely.