Zenith XBR413 - Page 50

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VDR ELECTRICAL TROUBLESHOOTING GUIDE
No External
Input 1 audio
<when playing DISC,
no audio output> check
Audio output even
When playing DISC
PN7401-6, 7 :
6 High / 7 Low
NO
Check IC2076 power and
R2602, R2603 signal
Check FFC Cable
and VCR part
Check IC6904 power
and other circuits
Check IC2078 – 15
and power, other circuits
NO
NO
NO
NO
YES
PN7601-19~22
Check audio signals
IC6904 – 1, 7
Check audio signals
IC6905-16
Check High?
Check IC6905 power
And Other circuits
YES
YES
YES
YES
No External
Input 2 audio
<when playing DISC,
no audio output> check
Audio output even
When playing DISC
PN5401 - 4~6
Check audio signals
NO
Check Audio Cable
Check IC2076 power and
R2602, R2603 signal
Check FFC Cable
and VCR part
Check IC6904 power
and other circuits
Check IC2078 – 15
and power, other circuits
NO
NO
NO
NO
NO
YES
PN7401 - 6, 7 :
6 Low / 7 High
PN7601-19~22
Check audio signals
IC6904 – 1, 7
Check audio signals
IC6905 - 16
Check High?
Check IC6905 power
And Other circuits
YES
YES
YES
YES
YES