Aiwa HV-MC90 Service Manual page 42

ELECTRICAL TROUBLESHOOTING -8/13
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
Pins 12, 36, 61, 67, 90, 96?
Does the Color signal
appear at the IC301
Pin 71, 75 ?
Replace the IC301.
NO
YES
NO
YES
Check the line of the 5.3V
Line. (Power Circuit)
Does the X301(4.43MHZ)
or X302(3.58MHZ) oscillate?
Does the Color signal
appear at the IC301 Pin55?
Check the circuit of the
IC301 Pins 60, 58, 35.
-42-
NO
Replace the X301 or
the X302.
NO
Check the Color Pass.
(Check the C341)
YES
Replace the IC301.