Sharp VC-780E Service Manual page 29

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Adjustment of NTSC System EP Slow tracking
Measuring Monitor TV
instrument
Recording and playback on
self-recording tape.
Input signal Video signal
{external input selector switch)
Adjusting point R857 (NTSC EP slow tracking
control)
Test point
Specification No noise bar on the monitor TV
screen
1. Feed the video signal to the video input terminal
(with the external input selector switch).
2. Make recording and playback on the self-recording
tape.
3. Press the slow button and play back the recorded
portion in the slow mode.
4. Set the tracking button to the center position.
Adjustment of still picture vertical syne (Performance check)
Measuring Monitor TV
instrument
Still picture playback
Tape used Self-recording tape
Test point Monitor screen
Adjusting point R8110 (V-Lock control)
Specification No vertical jitter
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Observing the monitor screen, adjust the still picture
V-Lock control (R8110) until the vertical jitter disappears
from the screen.