3-13
3. Y/C CIRCUIT
(3) When the C(Color) signal doesn’t appear on the screen in PB Mode,
Is 5.2VT/5.3VA applied to the
IC301 Pins24, 42, 55, 72, 91.
Is the Color Rotary signal
applied to the IC301
Pin70?
Check the line of the 5.2VT/
5.3VA Line. (Power Circuit)
Replace the X301.
Check the Color Pass.
Check the Color Rotary
Circuit. (IC501 Pin99 )
Check the Color Rotary
level. (Check the R303)
Does the X301(4.43MHZ)
oscillate?
Replace the IC301.
Does the Color signal
appear at the IC301 Pin21?
Is Color Rotary “H”
about 3.4V?
Replace the IC301.
NO
NO
NO
YES
YES
YES
YES
NO
NO
NO
YES
Does the Color signal
appear at the IC301
Pin25 ?
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