Zenith XBV323 Series Service Manual page 26

VCR ELECTRICAL TROUBLESHOOTING GUIDE
(3) Hi-Fi REC
No recorded Hi-Fi Audio Signal
Check Vcc of IC801.
(Pins3, 5, 15, 32, 36, 46, 54)
Check IC801 Pin37(Data), Pin38(CLOCK).
Do Audio signals appear at IC801 Pin6?
Do Audio signals appear at IC301
Pin76(Normal Audio)?
Do OSC signals appear at P3D02 pins4,5
(50Vp-p)
YES
YES
YES
YES
NO
Check Power.
NO
Check ports of µ-CPM.
(IC501 Pins71, 72)
NO
Check Audio input signal of IC801
Pin57(TU.A.), 7, 69(DVD.A.),
11, 73(AVI.A.), 9, 71(AV2.A.)
NO
Check C825, C306, R311, R312, R346.
NO
Check REC OSC BLOCK
(FL301, Q301~Q305, Q308, Q309)
Is IC501 Pin74 " High" in REC mode?
3-17
YES