Sony BVW-55 Maintenance Manual page 353

Check procedure
1. FWD back tension check
(1) Put the unit into the PLAY mode.
(2) Check that the indication at S side of the
torque cassette meets the specification.
Specification:
± 78 x 10 N.m {60 ± 8 gf.cm}
590 x 10 _5 _5
If not to meet the specification, perform step 2.
Adjustment procedure
2. FWD back tension adjustment
(1) Press the EJECT button, then unthreads the
tape.
(2) Take out the torque cassette.
(3) Hook the spring on another concave of the
hole of the S tension regulator drawer arm.
n
If the spring is hooked on another concave,
the back tension value deviates by up to
± 3 gf.cm from the specification 1.
When the specification is not met even if the
spring is hooked on another concave, stretch
out (extend) or bend (shorten) the hook of the
spring.
(4) Recheck the FWD back tension meets the
specification according to step 1.
n
After check and adjustment are completed, be
sure to set switch S100-1 on the SV-206 board to
OFF.
BVW-55 P2
S side FWD back tension measuring cassette tape
(Torque cassette)
_5
Spec. : 590 x 10 ±78 x 10
S tension regulator drawer arm
5-3-1. FWD Back Tension Check and Adjustment
_5
N.m {60 ±8 gf.cm}
Hook the spring on another
concave of the hole
S tension regulator arm
5-11