Zenith XBV613 Service Manual - Page 27
Hi-Fi REC
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UPC - 719192169715
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(3) Hi-Fi REC Hi-Fi REC. YES It is impossible to record Hi-Fi Audio signal. YES Check Vcc of IC801. NO (Pins3, 5, 15, 32, 36, 46, 54) YES NO Check IC801 Pin37(Data), Pin38(CLOCK). YES NO Do Audio signals appear at IC801 Pin6? YES Do Audio signals appear at IC301 NO Pin76(Normal Audio)? YES Do OSC signals appear at P3D02 pin5 NO (50Vp-p) Check Power. Check ports of µ-CPM. (IC501 Pins71, 72) Check Audio input signal of IC801 Pin57(TU.A.), 7, 69(DVD.A.), 11, 73(LINE1.A.), 9, 71(LINE2.A.) Check C825, R337, R338, C371, C3A1 Check REC OSC BLOCK (Q301, Q302, Q304~Q307) YES Is "High" IC501 Pin74 in REC mode. 3-16
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3-16
(3) Hi-Fi REC
Hi-Fi REC.
It is impossible to record Hi-Fi Audio
signal.
Check Vcc of IC801.
(Pins3, 5, 15, 32, 36, 46, 54)
YES
YES
Check IC801 Pin37(Data), Pin38(CLOCK).
YES
Do Audio signals appear at IC801 Pin6?
YES
Do Audio signals appear at IC301
Pin76(Normal Audio)?
YES
Do OSC signals appear at P3D02 pin5
(50Vp-p)
YES
YES
Check Power.
NO
Check ports of μ-CPM.
(IC501 Pins71, 72)
Check Audio input signal of IC801
Pin57(TU.A.), 7, 69(DVD.A.),
11, 73(LINE1.A.), 9, 71(LINE2.A.)
NO
Check C825, R337, R338, C371, C3A1
Check REC OSC BLOCK
(Q301, Q302, Q304~Q307)
Is
“
High
”
IC501 Pin74 in REC mode.
NO
NO
NO