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6.2.2.2 BACK TENSION CONFIRMATION
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Purpose:
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To fine adjust the Back Tension so that the tape runs smoothly with a constant tension.
Symptom of Misadjustment:
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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.
Measurement Procedure
Equipment Required:
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Back Tension Meter (Made in U.S.A., Purchase Locally)
VHS Cassette Tape (120-Minute Tape)
Specification
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25 +/- 2.5g
1. Play back a T120 cassette tape from the beginning for approx. 10 to 20 seconds to stabilize
tape movement.
2. Insert a Tension Meter into tape path and measure the back tension.
3. If the reading is out of specification, make sure that there is no dust or foreign material
between the Tension Band of Tension Arm Unit and the Reel Table.
If cleaning does not correct the tension measurement, replace the Tension Spring and the
Tension Arm Unit.
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Fig. M3-1
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