Sony TC-765 - Tension and Back Tension Adjustments

TC-765
Pinch Roller Pressure Check
— playback mode —
1. Place the dial-cord ring between the pinch
roller and pinch-roller cap.
pinch roller pinch-roller cap
t
dial cord (0.5mm dia.)
In playback mode, pull the spring scale on the
center line made by the centers of the capstan
and pinch roller.
3. Slowly return the pinch roller and read the
spring scale just when the pinch roller starts to
rotate.
i :
SF)
®
OOOO
ae = Senn eee
pinch roller
spring scale
800 g—1,200 g,
(1lb 120z—2 lb 10 0z) \
pressure difference Pull.
between the take-up
and supply sides:
within 200g (7 02)
Forward Torque Adjustment
; ; hub for measurement
Remove the side board (right).
Apply the rated ac voltage to the AC IN.
Set the TAPE SPEED switch to 19 cm/s and
REEL SIZE switch to 10%.
In playback mode, adjust RV703 for the
specified torques.
Set REEL SIZE switch to 7 and check torques.
2 Set the tension
REEL
SIZE
switch
arm
to
ON
position
using a rubber band
etc.
"
soz | 520-580g0m | 260-320 gem PRES Cees
(7.3-8.0 oz inch} | (3.6-4.4 oz inch}
380-440 g-cm 180—240 g-cm
(5.3-6.1 oz-inch} | (2.5—3.3 oz-inch}