Sony BVW-55 Maintenance Manual page 263

5. Timing belt installation
(1) Clean the pulleys of the swing gear and
capstan motor with cleaning cloth moistened
with cleaning fluid.
(2) Put the timing belt removed in procedure 2
on the pulley of the swing gear .
(3) Put the other end of the timing belt on the
pulley of the capstan motor.
(4) Push the arm of the gear assembly in the
direction indicated by the arrow with fingers
and release it gently. The arm of the gear
assembly slightly returns in the clockwise
direction by spring force.
(5) Tighten the two screws loosened in step (1)
of procedure 2. At that time, do not hold the
arm of the gear assembly with fingers.
Reference
The tension of the timing belt is adjusted by
performing steps (4) and (5).
(6) Apply locking fluid to the screws after
tightened in step (5). When applying, avoid
the slot of the screw.
BVW-55 P2
Pulley of swing gear Timing belt
2 Screw 1 Arm
(Tighten after 1 is done.)
(Push it in the arrow direction,
and then release gently.)
3-13. Capstan Motor Replacement
Pulley of capstan motor
3-51