Zenith XBV613 Service Manual - Page 23
When the CColor signal doesn, t appear on the screen in PB Mode
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3. Y/C CIRCUIT (3) When the C(Color) signal doesn't appear on the screen in PB Mode, Is SW 5V applied to IC301 NO Pins23, 44, 45, 52, 68, 77? YES Does the Color signal NO appear at IC301 Pins41, 50? Check the line of the REG 5V Line. (Power Circuit) Is the oscillation frequency NO of X301 (3.58MHZ) normal? Replace X301. YES Replace IC301. Does the Color signal NO appear at IC301 Pin48? YES Check C342, C341, R333. Replace IC301. 3-12
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3-12
3. Y/C CIRCUIT
(3) When the C(Color) signal doesn
’
t appear on the screen in PB Mode,
Is SW 5V applied to IC301
Pins23, 44, 45, 52, 68, 77?
Does the Color signal
appear at IC301 Pins41,
50?
Check the line of the REG
5V Line. (Power Circuit)
Replace X301.
Check C342, C341, R333.
Is the oscillation frequency
of X301 (3.58MHZ) normal?
Replace IC301.
Does the Color signal
appear at IC301 Pin48?
Replace IC301.
NO
YES
YES
YES
NO
NO
NO