Sony TC-765 - Section 3: Mechanical Adjustments; Tape Path and Head Height Adjustments; Roller, Brake, and Torque Adjustments

SECTION 3
MECHANICAL ADJUSTMENT
3-1. MECHANICAL ADJUSTMENTS
Tape Path Adjustment
1. In playback mode, travel a blank tape SLH-S1,
and adjust the positions of the tension-arm
guide and intermediate pin.
adjustment screws (hexagonal socket)
tension arm
guide
guide roller intermediate pin
Tape should travel
in the center of
this width.
After the adjustment, tighten the adjustment
screws.
Travel a blank tape SLH7-740 and adjust the
position of the tape guides to eliminate tape
curls.
2.
0.025mm
tape guide
tape guide
Travel a blank tape SLH-S1 and adjust the
height of each head for the specified clearances.
To adjust the erase head height, select appro-
priate spacer.
To adjust the record and playback heads, turn
the height/zenith adjustment screws in the same
angle and direction.
height/zenith adjustment screws
After the adjustment, apply a suitable locking
compound to the adjusted screws.
SONY-00527 / DRUCK 6
Reel Table Height Adjustment
| TC-765 TC-765 |
— playback and rewind modes —
1.
Loosen the adjustment screws and adjust the
height of the reel tables for the specified height.
If the tape touches the reel in playback, fast
forward and rewind modes, recheck the tension
arms, standard reels and the tape.
Pinch Roller Lever Position Adjustment
Remove the head cover.
Reattach both the pinch rollers.
Place the set in the playback mode. Check that
the solenoid is in on condition (energized).
Loosen the adjustment screw and push the
slide adjustment plate in the arrowed direction
for the specified clearance between the pinch
roller levers A and B, and tighten the adjust-
ment screw.
After the adjustment, apply a suitable locking
compound to the adjustment screw.
Pinch roller lever B
pinch roller {right}
sliding adjustment plate
adjustment screw
Note: Adjustment screw positions for the 2T
PB and 4T PB heads are the same as the
2T REC head.
Azimuth adjustment screws are so con-
structed to react each other. Take care
in adjusting azimuth adjustment screw.
Tape should travel in the center of this width.
7" standard tape reels
height/zenith adjustment screws
5+0.5mm
(123/39)
reel tables
SC4x6
chassis
adjustment screws
(hexagonal socket}
angle adjustment
screws azimuth adjustment screws
Brake Adjustment (1) brake band shoe
adjustment screw brake band
Adjust both the supply- and take-up-side brakes.
brake solenoid brake band guide
In stop mode, 0.5—0.7mm clearance should
exist between the brake-band guide and brake
band.
In playback mode (the brake solenoid should
be in ON condition), loosen the adjustment
screw and adjust the position of the solenoid
link in the arrowed direction so that the brake
band and brake-band guide uniformely touch.
solenoid link @ In playback mode, the
brake band should
uniformely touch the
brake band guide at
brake drum here.
ge
brake band
0.5~0.7mm
(35/6q")
In playback mode, this
clearance should even.
Note: If the brake-release stroke is long, the
brake band may bend at the position
shown with *. Be sure not to bend the
brake band.
After the adjustment, apply a suitable locking
compound to the adjustment screw.
Brake Adjustment (2) and Brake Torque
Adjustment
Adjust both the supply- and take-up-side brakes.
In stop mode, loosen the adjustment screw
and adjust the position of the brake stopper for
the specified clearance between the brake
stopper and brake lever.
brake stopper
brake lever
After the adjustment, tighten the adjustment
screw and apply a suitable locking compound
to the screw. Adjust hooking
position.
Measure both the forward and backward brake
torques. Adjust spring-hook position for the
specified torques.
backward
1,800—2,500g-cm
(25-34 oz-inch)
600—700 g-cm
(8.5—9.5 oz-inch)
backward torque: adjustment screw
forward
brake arm
forward torque:
reel table