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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 terminal "K8F"
No
Check IC5001 and peripheral circuit.
Check 5V_AUDIO, 9V power supply.
No
Check IC5031, 5V_AUDIO and peripheral circuit.
Check the Mute signal at pin 1 of IC5031. The Mute signal is output from
pin 92 of IC 301<Scaler>. The OUT_DET signal is sent from Audio Out
terminal.
Mute-On: H at pin 347 of IC301, L at pin1 of IC5031
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