-65-
Troubleshooting
No Sound
Check following steps.
Check IC5001 and peripheral circuit.
Check 9V power supply.
Check if the audio signal
is observed at pins 2 and
9 of IC5001.
Check audio output circuit.
Check speaker, connection of the terminal “K8F”.
Yes
No
Check IC5031 and peripheral circuit.
Check the Mute signal at pin 1 of IC5301. 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 IC5031.
Check if the audio signal
is observed at pins 5 and
8 of IC5031.
Yes
No
Check IC5002 and peripheral circuit.
Check the Pins 7 and 16 of IC5002, the voltage is respectively -7V and
5V.
Check the pin 10 of IC5002.
Check if the audio signal
is observed at pins 3 and
13 of IC5002.
Yes
No
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