No Sound - promethean PRM-30A Service Manual

Troubleshooting

No Sound

Check following steps.
Check if the audio sig-
nal is observed at pins 7
and 15 of IC5001.
Yes
The Mute signal is output from pin 67 of IC 301<Scaler>. The OUT_
DET signal is sent from Audio Out terminal.
Mute-On: H at pin 67 of IC301.
Check Audio Out Terminal and peripheral circuit
No
Check IC5001 and peripheral circuit.
Check 1V power supply.
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