Zenith XBR413 - Page 49

3-60
VDR ELECTRICAL TROUBLESHOOTING GUIDE
When playing DISC,
no audio output
Check IC2078 power
and other circuits
IC7601-1 : HIGH
DAC RESET status
Check IC7601 power
And Other circuits
IC7601-8, 9 I
2
C sig-
nal normal
NO
NO
Check R110, R109,
R7637, R7638
YES
YES
No OPTICAL /
DIGITAL output
Check VCR PART
IC7401-1
signal normal
Check FFC Cable
Signal flow
NO
YES
No TUNER
audio output
<when playing DISC,
no audio output> check
Audio output even
When playing DISC
PN7401-6, 7 :
6, 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