Sony wm dd 11 service manual

Page 1

SERVICE MANUAL

Model Name Using Similar Mechanism

WM-DDI

Tape Transport Mechanism Type

MT-WM DDll-16

SPECIFICATIONS

Frequency response
40 - 15,000 Hz
Wow and flutter
10.25% (DIM/0.15% WRMS (NAB)
Power output
Headphones: 10 mW +10 NW (at 10%
harmonic distortion)
load impedance 16 ohms at DC
operation
Outputs HEADPHONES jack (stereo minijack)
load impedance 8-300 ohms
Power requirements
3 V DC, two R6 (size AA) batteries
DO IN 3V jack accepts:
-EBP»SOOB battery case (not
supplied) lor use on two R20 (size
D) batteries
~AC-02M AC power adaptor (not
supplied) for use on 220 V AC,
50 Hz
-DCC-7O car battery cord (not
supplied) for use on 12V car battery
Dimensions
Approx. 82.1 x1193 x 37.1 mm (w/nld)
incl. projecting parts and controls
Weight Approx. 250 9 incl, batteries, not incl.
other accessories
Accessories supplied
Stereo headphones (t),
Carrying case (1)

Design and specifications subject to change
without notice.

Notes

- This appliance conforms with EEC Directive
B7IGOB/EEC regarding interference
suppression.

. II a car battery cord or an AC power adaptor
not manufactured by Sony is used, a (use
must be installed in the battery cord or the
AC power adaptor and the polarity ol the plug
must be as illustrated.

Notes on Batteries _

. When the batteries are run down, the
BATI'ERY indicator glows faintly.
' Battery life

. Continuous
Batteries playback hours
Sony batteries
SUM-3 (NS) Approx. 35 hrs.
Sony alkaline
batteries AM3 (N) Appmx' 7 '5

For maximum performance we
recommend the use of alkaline batteries.

- To avoid damage from battery leakage
and corrosion. remove the batteries
when you will not use the unit lor a long
time,

o The unit does not operate on the
internal batteries when the DC IN 3V
jack is used.

Dolby noise reduction manufactured under license from

Dolby Laboratories Licensing Corporation.

"DOLBY" and the doubleD symbol III are trade-marks of

Dolby Laboratories Licensing Corporation.

CASSETTE PLAYER}
SONY®

Page 2

WM-DDll

TABLE OF CONTENTS

Section E 39.35
Specifications 1
Servicing Notes 2
l. ADJUSTMENTS ................................................. 3
2. DIAGRAMS

2-1. Semiconductor Lead Layouts ........................ 7

2-2. Printed Wiring Board

2-3. Schematic Diagram
3. EXPLODED VIEWS ........................................... 11
4. ELECTRICAL PARTS LIST .............................. 14

SERVICING NOTES

Flexible Circuit Board Repairing

-Keep the temperature of the soldering iron around
270C during repairing.

-Do not touch the soldering iron on the same can-
ductor of the circuit board (within 3 times).

-Be careful not to apply force on the conductor when

soldering or unsoldering.

Note: on Chip Component Replacement

-Never reuse a disconnected chip component.

-Notice that the minus side of a tantalum capacitor
may be damaged by heat.

Note: on replacing the speed detection coil (F6901)
FG901 is pressed in chassis.

Replace as chassis assy when FG901 is defective.
Decide if FG901 is defective or not by removing lead
wires of FG901 from audio board and measuring DC
resistance value.

DC resistance value of FG901 : Approx. 690.0