Sony WM-DD11 Service Manual

WM-DD11
SECTION 1
ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-
moistened swab :
playback head pinch roller
capstan rubber belt
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.
1-1. MECHANICAL ADJUSTMENT
Torque Measurement
22 - 38 g-cm
(0.31 - 0.52 oz-inch)
FWD
CQ-102C
1 - 2 g-cm
Back Tension (0.01 - 0.02 oz-inch)
More than 65 g-cm
easel Kato (more than 0.9 oz-inch)
Tape Tension Measurement
More than 60 g
pw edad (more than 2.12 oz)
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.
Specification :
170 + 20g (5.3 - 6.7 oz)
SU,
Hook the spring scale to one of
these holes and pull it in the
direction of arrow.
Wow & flutter and motor position
1. Adjust with the adjustment screw so that rotor
thrust play is within 0.1mm. (When confirming
0.02 - 0.1mm
play, press motor down so that the motor pulley
and rotor rubber section do not touch.)
2. Wow & flutter adjustment
Setting :
2.5V
Tape: Adjust by using end portion of tape.
VOLUME control: mechanical mid
TAPE SELECT switch : NORM
DOLBY NR switch: OFF
Power supply voltage :

Sony WM-DD11 Specifications

General

Brand	Sony
Model	WM-DD11
Category	Cassette Player
Language	English