Zenith XBR411 Manual page 26

VCR ELECTRICAL TROUBLESHOOTING GUIDE
3. Y/C CIRCUIT
(2) Hi-Fi Playback
PB mode
YES
No Sound.
YES
Check the Vcc of IC801
(Pins3, 15, 32, 36, 46, 54)
YES
Check the Hi-Fi Selection switch.
(IC801 Pin39) and the Tape quality.
YES
Is the RF Envelope at
IC801 Pin23 over 2Vp-p?
YES
Check IC801 Pin37(Data),
Pin38(Clock)
YES
Do Audio Signals appear at
IC801 Pin80(L-CH), 78(R-CH)?
YES
Do Audio Signals appear at
JK601?
NO
Check Power 5.2V, 9V.
NO
Check IC501 Pin19
(A.H/SW)
NO
NO
Check the parts of µ-COM
(IC501 Pins71, 72)
NO
Check the Connection at
P3D01 Pins7, 9.
NO
Check the Jack(JK601)
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