Sony VX-14MW1E, Service Manual

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4-2. BACK TENSION MEASUREMENT
(See Fig.4-6~4-7)
a. Confirm that the position of the TENSION POLE is correctly POSITIONED. Refer to the "4-4 TENSION
POLE POSITION ADJUSTMENT ".
b. Play back a T-120 TAPE at its center position without assemblying F/L ASSEMBLY and wait until the
TAPE running is stabilized (about 5~10 seconds).
c. Bring the TENTELOMETER into contact with the TAPE (Fig.4-6) and measure the BACK TENSION. The
measuring result should be between 25 and 33 grams.
d. If the measuring result is not within this specification, refer to the NOTE below or repeat "4-4 TENSION
POLE POSITION ADJUSMENT". (Fig. 4-7)
DATUM HOLE
TAPE
NOTE:
If the measuring result is not within the specification, change the TENSION SPRING position. (To
decrease the result, choose hook A. Otherwise, choose hook B).
Confirm that all of the three probes of the TENSION METER are in contact with the TAPE.
During this process, don't touch any other parts of the MECHANISM (i.e, MAINBASE).
It is recommended that this measurement be repeated at least three times for an accurate reading.