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SECTION 3
ADJUSTMENTS
3-1. MECHANICAL
ADJUSTMENTS
PRECAUTION
1. Clean
the
following
parts
with
a denatured-
alcohol-moistened swab:
record/playback
head
pinch roiler
erase head
rubber belts
capstan
idlers
2. Demagnetize
the record/playback
and erase head
with a head demagnetizer.
3. Do
not
use
a magnetized
screwdriver
for the
adjustments.
4. After
the
adjustments,
apply
suitable
locking
compound to the parts adjusted.
5. The
adjustments
should
be performed
with
the
rated
power
supply
voltage
unless
otherwise
noted.
capstan
tape guide (S)
pinch roller (S)
erase head
REC/PB head
FLYWHEELS
T/S
THRUST
ADJUSTMENT
1, FLYWHEEL
T THRUST
ADJUSTMENT
:
Insert
3mm
— thick
spacer
guage
into
the
clearance between magnet of FLYWHEEL
T and
CAPSTAN
Board, and
adjust
THRUST
SCREW
so that thrust play is 0.2—-0.4mm .
2. FLYWHEELS
THRUST
ADJUSTMENT
:
Tighten
THRUST
SCREW
lightly
until
the
flywheel has no play and then loosen the screw
by 1/2-—3/4
turns.
3. After adjustments, apply locking compounce
to
_ the screws.
pinch roller (T)
Pinch Roller Pressing
Force Measurement
Mode:
playback
Hook needle of the tension gauge to the pinch roller
shaft and push back pinch roller to detach it from
capstan.
Then, return
it gradually
to capstan
and
read the gauge when the pinch roller begins turnning.
Standard
Limits :
Tape-up
side:
270 — 350g (9.5 — 120z)
Supply side:
180 — 280g (6.4 ~ 9.90z)
capstan
pinch
roller
tension
gauge
THRUST
SCREW
CAPSTAN
BOARD
THRUST
SCREW
LI
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9)
Take up side
REAR VIEW OF MECHANISM
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