Audio Circuit (4Head Model) - GPX TVR950 Service Manual

TROUBLESHOOTING GUIDES
5. AUDIO CIRCUIT ( 4 HEAD MODEL)
A.
No sound in the E-E mode
Is 5V supplied to pin 77
of IC301?
Is signal input pin 76
of IC301 in line mode?
Is 0V supplied to pin 58
of IC301?
Is there output at pin10
of IC301?
Check OUTPUT JACK
NO
YES
NO
YES
NO
YES
NO
YES
Check power circuit.
Check INPUT JACK
Check SYSCON circuit
Change IC301
18
Appendix