Sony AV-3420CE Service Manual page 45

9-2-4. Tension Control System
A simple mechanical servo is employed to
provide tape tension control. See Fig. 9-3.
Tape passes around the outside of the Tension
Arm. A Band Brake, anchored at the pivot of the
Tension Arm by a screw, contacts the Supply Reel
Table to exert a force inversely proportional to that
applied at the Tension Arm. Thus, with no tape on
the machine (no force applied to the Tension Arm),
the Tension Arm is in its fully clockwise position
and full band braking is applied to the Supply Reel
Table.
@ supply reel
) tension arm
@ tension regulator
release arm
(2) tension regulator release rod
brake release
slide plate
® release arm
@2 take-up reel
pressure lever {A}
take-up take-up
pulley reel table
(9) take-up pull rod
(6 take-up pulley
i) pinch roller
2) capstan
@3) pinch roller
pressure plate
=
@4) solenoid plunger
[a Seen |
\
|
(S)funetion select cam @) function lever + | (O)record lock | |
Fig. 9-3 Forward mode tape transport
9-3