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Video Noise, Unsynchronous - NEC N9902 F-1 Service Manual

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3. VIDEO NOISE, UNSYNCHRONOUS

CHECK C114, R116
D109, R115, R117
CHECK U301
CHECK
Q101 G-S FREQUENCY
YES
SYNCRONIZE
NO
WITH H-SYNC
YES
CHECK
Q312 FREQUENCY
SYNCRONIZE
NO
WITH H-SYNC
NORMAL OPERATION
19
CHECK HORIZONTAL
NO
FREQUENCY C114 TO GND
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