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SECTION
2
oy
ADJUSTMENTS
2-1.
MECHANICAL
ADJUSTMENTS
[
PRECAUTION
1.
Clean
the
following
parts
with
a denatured-
alcohol-moistened swab:
playback head
pinch roller
capstan
idlers
rubber belts
2.
Demagnetize
the playback
head
with
a head
demagnetizer.
(Do not bring the head demag-
netizer close to the erase head.)
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.
Head Height Adjustment
1.
Prepare an adjustment cassette as shown below.
C-120
Cut out hatched
tape cassette
portions.
2.
In playback mode and viewing from the front,
adjust the head heights to eliminate tape curl
and tape twist at portions shown by arrow.
playback
head
3-578-138-01
(t=0.1)
3-578-138-11
(t=0.2)
Shim, head height adjustment
Torque Measurement
Meter Reading
25-45 g-cm
(0.34—0.62 oz.inch)
more than 70 g-cm
(0.97 oz inch)
1-4 g-cm
Forward
CQ-102B
Fast Forward
and Rewind
Tape Tension Measurement
Meter Reading
CQ-403A
more than 130 g (4.59 oz)
CQ-201B
CQ-102B
Pinch Roller Pressure Measurement
— Playback Mode —
C2] Slowly return the pinch roller
and read the spring scale just when
\
the pinch roller starts rotating.
(The capstan should
first contacts here.)
pinch
roller
Qtension gauge
250-330 g
(8.82—11.64 oz)
Flywheel Thrust Play Adjustment
— Playback Mode —
dc ammeter
terminals of the
battery case
1.
Turn
the thrust screw
counterclockwise
until
the screw tip leaves from the flywheel shaft.
2.
Gradually
turn
the thrust screw
clockwise.to
the position where the motor current suddenly
increases.
3.
Then,
turn
the thrust screw
counterclockwise
about
% turn
from
the position
obtained
in
step 2.
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