Zenith XBV243 Service Manual page 22

TROUBLESHOOTING (CONTINUED)
Y/C CIRCUIT
(3) When the C(Color) signal doesn't appear on the screen in PB Mode,
Is 5V applied to IC301
Pins 12, 36, 61, 67, 90, 96?
YES
Does Color signal appear
at the IC301 Pins 58, 60?
YES
Replace IC301.
VR168 - 923-03485
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ELECTRICAL
NO
NO
Does X301(3.58MHZ)
oscillate?
Does the Color signal
appear at IC301 Pin55?
Check the circuit of
IC301 Pins 60, 58, 35.
3-10
Check the line of the REG
5V Line. (Power Circuit)
NO
NO
Check the Color Pass.
(Check C341)
YES
Replace IC301.
D35E COMBO - ELECTRICAL
Replace X301.