Panasonic PVD4742 - DVD/VCR DECK, Руководство по обслуживанию

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1. While slowly turning the Upper Cylinder Unit counterclockwise by
hand, gently rub the Video Heads with a Head Cleaning Stick
(VFK27) moistened with Ethanol.
When using a Cleaning Cassette, make sure to use "DRY" type
only and be aware that excessive use can shorten head life.
Fig. M1
Note:
1. Do not rub vertically or apply excess pressure to the Video Heads.
Do not turn the Upper Cylinder Unit clockwise while cleaning.
2. After cleaning, use a Dry Head Cleaning Stick (VFK27) to remove
any Ethanol remaining on the cylinder tape path. Otherwise, tape
damage will occur.
6.2.2. ADJUSTMENT PROCEDURES
6.2.2.1. BACK TENSION CONFIRMATION
Purpose:
To fine adjust the Back Tension so that the tape runs smoothly
with a constant tension.
Symptom of Misadjustment:
1) If the tape tension is less than the specified value, the tape
cannot come into proper contact with the Video Heads, resulting
in poor picture playback.
2) If the tape tension is too high, the tape will soon be damaged.
Equipment Required:
Back Tension Meter (Made in U.S.A., Purchase Locally)
VHS Cassette Tape (120-Minute Tape)
Specification:
22.4 gf±2.5 gf
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