Sanyo PLC-WK2500, Service Manual

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Troubleshooting
No Sound
Check following steps.
Check IC5001 and peripheral circuit.
Check S-7V and S5V power supply.
Check if the audio signal
is observed at pins 1 and
7 of IC5001.
Check audio output circuit.
Check speaker, connection of the terminal “K8F”.
Yes
No
Check IC001 and peripheral circuit.
Check the Mute signal at pin 1 of IC001. The Mute signal is output from
pin 267 of IC 301<Scaler>. The OUT_DET signal is sent from Audio Out
terminal.
Mute-On: H at pin 267 of IC301, L at pin 1 of IC001.
Check the AMP-STBY signal at pin 2 of IC001. The AMP-STBY signal is
output from pin 182 of IC301.
Check if the audio signal
is observed at pins 36
and 42 of IC001.
Yes
No
Check IC5002 and peripheral circuit.
Check the Pins 7 and 32 of IC5002, the voltage is respectively 3.3V and
1.8V.
Check if the audio signal
is observed at pins 19
and 23 of IC5002.
Yes
No