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WM-DDH
PRECAUTION
SECTION 3
ADJUSTMENTS
1.
Clean the following parts with a denatured-
alcohol-moistened swab:
playback head
pinch roller
capstan
2.
Demagnetize the playback 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.
3-1.
MECHANICAL ADJUSTMENT
Torque Measurement
Perform with 2.5 V DC power.
Torque
meter
Meter reading
FWD
CQ-102C
22 - 46 g*cm
(0.3 - 0.63 oz*inch)
FF, REW
CQ-201B
More than 65 g»cm
(More than 9.04 oz*inch)
Back
Tension
CQ-102C
1 - 3.5 g-cm
(0.01 - 0.05 oz«inch)
Tape Pull¬
ing Force
CQ-403
More than 80g*cm
(More than 11.12 oz*inch)
Pinch Roller Pressure Adjustment
— Playback Mode —
1. Pull the spring scale in the direction shown by
the arrow.
2. Slowly return the pinch roller and read the
spring scale just when the pinch roller starts
rotating.
q
XoX
Specification:
170±20g (5.3 ~6.7 oz)
o
Head Height Adjustment
1.
Prepare an adjustment cassette as shown below.
C-120
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 the arrow.
playback head
n
r
m
3-578-138-01 (t= 0.1)
3-578-138-11 ft = 0.2)
Sh im, head h eigh t ad jus tmen t
3. If necessary, adjust the height of the tape-guide
by turning the adjustment screw.
adjustment screw
4. Apply locking compound on adjustment screw.
5
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