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Text excerpt from page 56 (click to view)
TROUBLESHOOTING GUIDE
THE AUDIO CAN NOT RECORD
Is bias level at L104 OK?
NO
Is the voltage at pin 2 of L104 5V?
NO
Check POWER circuit.
YES
YES
Is the voltage at pin 29 of IC3001 about 5V?
NO
Change IC3001.
L104 is broken or shorted.
Is there audio signal at pin 5 of CP102?
NO
Check the circuit between pin 4 of IC101 to pin 5 of CP102.