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Text excerpt from page 13 (click to view)
3-3. SERVO SYSCON CIRCUIT B. A.
Playback picture is not good. YES Noise appears on the screen on the whole. YES Are SW pulse and HA SW applied to PreAmp circuit? NO Noise appears although change cassette tape. YES Check and re-adjust the Path of Deck. YES Is Enve.wavefrom supplied to pin 4 of PT01 YES NO NO Check D.PG input and connector between deck and main PCB. Noise shakes up and down on the screen. YES NO Check pattern NO Check flow A Playback picture is not good. YES
Noise appears although adjusting tracking. YES
Is SW pulse obtained from pin 16 of IC601?
YES
Is CTL pulse applied to pin 73 of IC601.
NO
CTL HEAD height is normal and there is not dust.
NO
Adjust the HEAD height and remove dust.
Check video circuit.
Check connector, Head Amp and Head dust.
NO
Change head
C.
YES YES Check circuit adjacent to IC601. Auto stop during playback. YES Check R668, R669 C508, C509. Is Reel pulse applied to pin 5 and 6 of IC601? YES The voltage of pin 91 of IC601 is not changed. YES NO Check R518 and C511. Is D.FG applied to pin 67 of IC601 YES NO Check connector and D.FG circuits. NO Check reel sensor.
