2-12
MEASUREMENT AND ADJUSTMENT OF
BACK TENSION
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.
A : Measurement Procedure
*Equipment Required :
Back Tension Meter (Made in U.S.A., Purchase Locally)
VHS Cassette Tape (120-Minute Tape)
*Specification ......................................................... 20 ~ 25g
1. Play back a T120 cassette tape from its beginning for
approx. 10 to 20 seconds, until the tape’s movement has
stabilized.
2. Insert a Tension Meter into tape path and confirm the
reading.
3. If the reading is out of specification, do the adjustment
procedure.
Fig. M8
Note :
1. Be sure that the three probes of the meter are all
in solid contact with the tape, but out of contact with
any other parts while measuring.
2. It is recommended that measurements be taken
three times because the tension meter is very
sensitive to external vibrations.
FE Head
Unit
Probes of Gage
P1
P2
B : Adjustment Procedure
1. Remove the Cassette Up Ass'y. Then re-position the Tension
Spring on the Tension Arm Base Teeth in either direction
as indicated by the arrow to obtain the specified tension.
(See Fig. M9).
2. Re-position the Tension Spring toward the front to increase
tension, or toward the rear to decrease tension.
3. Reinstall the Cassette Up Ass'y and verify tension with the
meter once again.
Note :
If the specified tension is not obtained even if the
Tension Spring is re-positioned, replace the Tension
Spring, and the Tension Band, clean the Reel Table,
or make sure there is no dust between the Tension Band
and the Reel Table.
Fig. M9
Tension Arm Base Teeth
Less
More
HEIGHT ADJUSTMENT OF REEL TABLES
Purpose :
To properly align the height of the tape wound on the
Supply and Take-Up Reels.
Symptom of Misadjustment :
If the height of the tape is not properly aligned, the tape will
eventually be damaged.
* Equipment Required :
Post Adjustment Plate ............................ (VFKS0010)
Reel Table Height Fixture ....................... (VFKS0009)
* Specification ................................................. 0
±
0.1mm
1. Remove the Cassette Up Ass'y.
2. Place the Post Adjustment Plate over the reels, and put the
fixture on it. Set the fixture to zero (“0”) and ensure that the
foot of the fixture touches the cut-out portion of the plate.
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Page 173: ...Printed in Japan R...
