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Yamaha PDM-4220 Service Manual page 25

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TV Signal
[Tuner PWB Circuit]
No Picture of TV
Yes
Is waveform at
pin 49 of PTV2
(TV,CV?)
No
Is waveform at
Yes
pin 7 of I101
(TV,CV)?
No
Is waveform at
Yes
pin 18 of U101
(TV,CV)?
No
Check U101
PDM-4220
Check
Video PWB
Check Q106
Check around
Q101,Q102,Q103
25

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