No Sound - Sanyo PLC-XU355A Service Manual

Troubleshooting

No Sound

Check following steps.
check if the audio signal
is observed at pins 7 and
15 of Ic5001.
Yes
check if the audio signal
is observed at pins 5 and
6 of Ic001.
Yes
Check audio output circuit.
Check speaker, connection of the terminal "K8F".
No
Check IC5001 and peripheral circuit.
Check S1V, 11-AMP power supply.
Check IC001, 11-AMP and peripheral circuit.
No
Check the Mute signal at pin 4 of IC001. The Mute signal is output from
pin 191 of IC 301<Scaler>. The OUT_DET signal is sent from Audio Out
terminal.
Mute-On: H at pin 191 of IC301, H at pin 4 of IC001
Check the ShutDown signal at pin  of IC001. The SD signal is outpt from
pin 1 of IC301<Scaler>.
AV_ShutDown_ON: H at pin 1 of IC301, L at pin  of IC001.
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