Sony Betacam SX DNV-5 Maintenance Manual page 164

4-1-3. FWD Back Tension Adjustment
Confirmation
1. Entering the REC state
(1) Turn on the power.
(2) Insert a FWD back tension measurement
cassette and press the REC key to enter the
REC state.
2. FWD back tension confirmation
Confirm that the S meter value of a FWD back
tension measurement cassette satisfies the
specifications.
If the specifications are not satisfied, perform
procedures 3 and later after confirming that the
value is higher or lower than the specifications.
Adjustment
3. Entering the EJECT state
(1) Press the REC key to cancel the REC state.
(2) Press the EJECT key and eject the FWD back
tension measurement cassette.
4. Back tension adjustment
Change the position where the adjustment spring
of the tension regulator assembly is put.
Adjustment method
. When the back tension is higher than the
specifications, shift the spring in the minus (–)
direction.
. When the back tension is lower than the
specifications, shift the spring in the plus (+)
direction.
5. FWD back tension confirmation after
adjustment
Perform procedures 1 and 2 of confirmation and
confirm that the specifications are satisfied.
4-6
_ +
Adjustment spring
Tension regulator assembly
S meter
Cassette compartment
FWD back tension measurement cassette
Specifications : 0.0036 ±0.0004 N.m
(36 ±4 gf.cm)
DNV-5
DNW-7/90/90WS