Panasonic Omnivision PV-V4621, Руководство по обслуживанию

Страница: 52 / 171

Symptom of Misadjustment:
If the position of the Audio Control Head is not properly adjusted,
the Audio S/N Ratio is poor.
1. Connect the oscilloscope to the audio output jack on the rear side
of the deck.
2. Play back the 6 kHz Monaural Audio portion of the alignment tape.
3. Adjust Black Screw (C) on the Audio Control Head base so that
the output level is at maximum.
Fig. M7
4. Confirm the height of the Audio Control Head is proper. If not,
readjust Black Screws (A) and (B).
7.2.2.3.5. AUDIO CONTROL HEAD HORIZONTAL POSITION ADJUSTMENT
Purpose:
To adjust the Horizontal Position of the Audio Control Head.
Symptom of Misadjustment:
If the Horizontal Position of the Audio Control Head is not
properly adjusted, a maximum envelope cannot be obtained at the
Neutral Position of the Tracking Control Circuit.
1. Insert the alignment tape.
2. Press and hold VCR/TV button and CH DOWN buttons on VCR
together over 5 seconds in power off condition.
The power comes on and the unit goes into service mode.
3. Play back the alignment tape.
4. To enter Tracking center mode, press PLAY button in Play back
mode. "TRACKING CENTER" will be displayed on the TV monitor.
5. Connect the oscilloscope to TP3002 on the Video Signal Process
Section of the Main C.B.A. Use TP6205 as a trigger.
6. Loosen the Black Screw (D) and tighten it slightly. Set the H-
Position Adjustment Driver into the Hole (A). Then slowly turn the
52