Zenith XBR411 Manual page 27

VCR ELECTRICAL TROUBLESHOOTING GUIDE
(3)
Hi-Fi REC.
It can't be recorded Hi-Fi Audio
signal.
Check Vcc of IC801.
(Pins3, 15, 32, 36, 46, 54)
Check IC801 Pin37(Data), Pin38(CLOCK).
Do Audio signals appear at IC801
Pins78, 80?
Do FM Audio signals appear at IC801
Pin27?
Check the Contact Point of Drum
Connector if good then Replace the Drum.
YES
YES
YES
YES
YES
YES
NO
Check Power 5V, 9V.
NO
Check ports of µ-COM.
(IC501 pins 71, 72)
NO
Check Audio input signal of IC801
Pins11, 73(AV1), 12, 74(VDR.A.), 9,
71(AV2).
NO
Replace IC801.
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