Sony AVD-K150B Service Manual page 25

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.
YES
Is the Color Rotary signal
applied to the IC301
Pin70?
YES
Is Color Rotary "H"
about 3.4V?
YES
Does the Color signal
appear at the IC301
Pin25 ?
YES
Replace the IC301.
NO
Check the line of the 5.2VT/
5.3VA Line. (Power Circuit)
NO
NO
NO
Does the X301(4.43MHZ)
oscillate?
Does the Color signal
appear at the IC301 Pin21?
YES
Replace the IC301.
AVD-K150B/K150E/K150G/K150N/K150R
Check the Color Rotary
Circuit. (IC501 Pin99 )
Check the Color Rotary
level. (Check the R303)
NO
Replace the X301.
NO
Check the Color Pass.
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