Zenith XBV613 Service Manual - Page 26
Hi-Fi Playback
UPC - 719192169715
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3. Y/C CIRCUIT (2) Hi-Fi Playback PB mode YES No Sound. YES Check the Vcc of IC801 NO (Pins3, 5, 15, 32, 36, 46, 54). YES Check the Hi-Fi Selection switch. NO (IC801 Pin39) and the Tape quality. YES Is the RF Envelope at NO IC801 Pin23 over 3Vp-p? YES Check IC801 Pin37(Data), NO Pin38(Clock) YES Do Audio Signals appear at NO IC801 Pin80(L-CH), 78(R-CH)? YES Do Audio Signals appear at NO JK901? Check Power. Check IC501 Pin19 (A.H/SW) Check the parts of µ-COM (IC501 Pins71, 72) Check the Connection at P3D01 Pins7, 9. Check the Jack(JK901) YES Check C801, C851, R801, R851. 3-15
3-15
3. Y/C CIRCUIT
(2) Hi-Fi Playback
YES
YES
YES
YES
PB mode
No Sound.
Check the Vcc of IC801
(Pins3, 5, 15, 32, 36, 46, 54).
Check the Hi-Fi Selection switch.
(IC801 Pin39) and the Tape quality.
Is the RF Envelope at
IC801 Pin23 over 3Vp-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
JK901?
Check Power.
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(JK901)
NO
Check C801, C851, R801,
R851.
YES