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troubleshooting
No Sound
Check following steps.
Check if the audio sig-
nal is observed at pins
10 and 21 of IC5001.
Yes
Check if the audio sig-
nal is observed at pins 5
and 8 of IC5031.
Yes
Check audio output circuit.
Check speaker, connection of the terminals "K8F"
No
Check IC5001 and peripheral circuit.
Check 5V_AUDIO, 9V power supply.
No
Check IC5031 and peripheral circuit.
Check the Mute signal at pin 1 of IC5031. The Mute signal is output
from pin 144 of IC 301<System Control>.
Mute-On: H at pin 144 of IC301, L at pin1 of IC5031
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