Zenith XBV243 Service Manual page 25

TROUBLESHOOTING (CONTINUED)
3. Y/C CIRCUIT
(B) Hi-Fi Playback
PB mode
YES
No Sound.
YES
Check the Vcc of IC801
(Pins 34, 40)
YES
Check the Hi-Fi Selection switch.
(IC801 Pin 41) and the Tape quality.
YES
Is the RF Envelope at
IC801 Pin 44 over 2Vp-p?
YES
Check IC801 Pin42(Data),
Pin 43(Clock)
YES
Do Audio Signals appear at
IC801 Pin16(L-CH), 17(R-CH)?
YES
Do Audio Signals appear at
IC802 Pin10(L-CH), 16(R-CH)?
YES
Do Audio Signals appear at
IC802 Pins 22, 26?
YE S
YES
Do Audio Signals appear at
JK801?
YES
Do Audio Signals appear at
TU701 Pin 2 (MOD A.IN)?
VR168 - 923-03485
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ELECTRICAL
NO
Check Power.
NO
Check IC501 Pin23
(A.H/SW)
NO
NO
Check the parts of µ-COM
(IC501 Pins90, 91)
N O
Check the Connection at
P3D01 Pins 7, 9.
N O
Check the A.IN line of
IC802 (C828, C829)
N O
Check the Vcc of IC802
Replace IC802.
N O
Check Jack(JK801)
N O
Check IC405.
3-13
NO
Pin 4.
YES
Check Power.
D35E COMBO - ELECTRICAL