Sony TC-377 - 2-1. Cabinet Removal; Mechanical Adjustments; Tension, Pinch Roller, and Torque Adjustments

-SECTION 3
ADJUSTMENTS
3-1. MECHANICAL ADJUSTMENTS
Precaution:
Do not use magnetized screwdriver for adjust-
‘ments, - oh Oe mS
After adjustments, apply locking paint to the
adjusted parts. —
Tension Regulator Adjustment
STOP mode
1. Loosen the adjusting screw and adjust so that
the clearance shown is 8 mm (5f6”) after
having been turned reel table counterclockwise
by hand. ,
supply reel table
tension regulator
adjusting screw. arm pin
tape guide
tension regulator pe g}
‘arm eh
locus drawn
by pin movement 7.5~8mm erase head
2. Tape should be in contact with tension regu-
lator pin uniformly at beginning and end
portion of it.
tension regulator pin
tape
tension regulator arm
SONY-00124/DRUCK4
Tension Regulator Back-tension Adjustment
FWD and FF modes :
This adjustment should be done after Tension
Regulator Adjustment. o
Use 7” reel tape.
in FWD mode 45~ 559g ;
: (1.59 ~ 1.94 oz)
in FF mode 15~ 20g
(0.53 ~ 0.71 oz)
stud ‘
“spring
@ é ' tension regulator
f tension gauge
arm pin :
Adjust by changing the spring hook position.
If necessary, adjust by bending the stud or perform
the tension regulator adjustment again.
Pinch Roller Pressure Check Pinch Roller Stroke Adjustment
STOP mode 1. .
1. Remove head deck: ass’y. (See “HEAD DECK 2:
REMOVAL?” on page 7) .
2.
Put
dummy
capstan
into
capstan
bearing
and
be
sure
that
the
‘clearance
between
pinch
levers
3,
@®
and
is
approx.
0.5mm
(1/64").
pinch lever
Remove head deck (See page 7).
Loosen adjusting screw @ so that pinch roller
shaft comes in contact with retractive lever at
position @) in STOP mode.
Fix adjusting screw @ while pushing the joint
lever in the direction shown by arrow.
4.. Put the dummy capstan into the capstan
bearing and be sure that pinch roller shaft
moves by approx, 3~4 mm (1/g~4/32") on the
surface of retractive lever when function
selector knob is changed from STOP to FWD.
5. Be sure that the washer on pinch roller shaft
does not come in contact with © position
when function selector knob is changed slow-
ly from FWD to FF.
capstan
pinch lever (A)
retractive lever
head deck —back view—
3. . Be sure that the tension gauge indicates 800~
1,000 g (1 lb 12 0z~21b 30z) when the pinch
roller is detached from capstan in FWD mode.
adjusting screw @)
joint lever
800 ~ 1,000g
(1/b 1202 ~21b 302)
retractive lever
head deck —back view—
pinch roller shaft
©
Bias Switch Position Adjustment
: Peay : (] '
Loosen
two
screws
and
adjust
by
positioning
the
.
Oe
ieee
switch.
;
yf
i
é 2 ~w) beer
Switch
should
be
turned
ON
in
FWD
mode,
i
il
sd
pl
seid
and with function selector knob: changed slowly aid 3~4mm (e~%fs2")
from FWD to STOP, record levers are released after
the switch turns OFF.
lin FWD mode) fin STOP mode)
(bias ose switch
$108)
Head deck bottom view.