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5-7 R.G.B. Video Amplifier Abnormal
RGB Video AMP Abnormal
Check
waveform at I501 pin 5, 6 and
7
Yes
Check
I502 pin 1, 2 and 3 collector
voltage (normally about 70V)
& waveform
Yes
Video signal present at the
pin of the CRT R.G.B.
Cathode
Yes
Defective cut-off circuit
(DC restore) I504
Check or replace the
No
signal cable or I501
No
Check I901
VM77S
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