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Text excerpt from page 18 (click to view)
3-3. SERVO SYSCON CIRCUIT
Playback picture is not good.
Noise appears although adjusting tracking. YES
Noise shakes up and down on the screen.
Noise appears although change cassette tape.
Check and re-adjust the Path of Deck.
Is CTL pulse applied to pin 73 of IC601?
CTL HEAD height is normal and there is not dust.
Adjust the HEAD height and remove dust.
Check circuit adjacent to IC601.
Is CTL pulse input to pin 71 and 72 of IC601?
Check R523, R524 C508, C509.
The voltage of pin 91 of IC601 is not changed. YES