Zenith ABV341 Series Service Manual page 22

3. Y/C CIRCUIT
(3) When the C(Color) signal doesn't appear on the screen in PB Mode,
Is 5V applied to the IC301
Pins23, 44, 45, 52, 68, 77?
YES
Does the Color signal
appear at the IC301
Pins41, 50?
YES
Replace the IC301.
NO
Is normal the X301
NO
(3.58MHZ) of oscillation
Frequency?
Does the Color signal
appear at the IC301 Pin48?
Replace the IC301.
3-13
Check the line of the REG
5V Line. (Power Circuit)
NO
NO
YES
Replace the X301.
Check the C342, C341,
R333.