Sony BVU-950 - Page 62

FOR
TRAINING
PURPOSES
ONLY
66. FWD BACK TENSION ADJUSTMENT
e It is required that the sec. 5-6-3 supply tension regula-
tor operating position adj. and sec. 6-5 FF back ten-
sion adj. are checked to be correct or properly ad- spring
justed before initiating this adjustment. oS
Tool and equipment. 48 \
Back tension adjustment jig. -
Reel table torque measurement tape ~
(100 mm dia.)
Tension scale (100 g full scale)
skew arm 8
skew lock
(
Preparation: (1) Push the skew arm in the arrow direc-
tion. OSs
(2) Turn on the POWER and put the
machine into the FR-STOP mode. ou
(When turn on the POWER, the S
drawer
roller
moves
to
the
FR-STOP
o®
position and put the machine into
the FR-STOP mode automatically.)
(3) Turn the pulley of gear box block in
the clockwise direction viewing from
the front panel with finger so that
the S drawer roller places in front of
the CTL PB head.
(4) Install the back tension adjustment
Jig.
(S$) Install the jig tape on the supply reel
table and thread the tape as shown in
figure.
Check that the tape does not curl at
the flange on S drawer roller.
(6) Turn the pulley in opposite direction
in step (3) so that the S drawer roller
is engaged with the S holder.
(7) Hook a tension scale on an end of
tape.
w\
0
S holder
S drawer roller
tension scale
(
i
N
aes
Check procedure: :
(1) Press the PLAY button and put into
PLAY mode.
back tension
(2) Pull out the tape at the constant adjustment jig
speed of approx. 9.5 cm/sec. in the
arrow
direction.
Spec.:
Check
that
the
scale
reading
meets
709
~
759
(on
scale}
the required specification.
Adjustment procedure:
(1) Select the proper spring hook of the
skew arm B so that the scale reading
meets the required specification.
(2) After this adjustment, check again
refer to check procedure.
/-1(B)