Sony WM-DD11 - Service Manual

SERVICE MANUA
Germany Model
Model Name Using Similar Mechanism
MT-WMDD11-16
Tape Transport Mechanism Type
SPECIFICATIONS
Frequency response
40 - 15,000 Hz
Wow and flutter
+ 0.25% (DIN)/0.15% WRMS (NAB)
Power output
Headphones: 10 mW +10mW (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
DC IN 3V jack accepts:
— EBP-500B battery case (not
supplied) for use on two R20 (size
D) batteries
— AC-D2M AC power adaptor (not
supplied) for use on 220 V AC,
50Hz
— DCC-70 car battery cord (not
supplied) for use on 12V car battery
Dimensions
Approx. 82.1 x 119.6 x 37.4 mm (w/h/d)
incl. projecting parts and controls
Weight Approx. 250 g incl. batteries, not incl.
other accessories
Accessories supplied
Stereo headphones (1),
Carrying case (1)
Design and specifications subject to change
without notice.
Notes
¢ This appliance conforms with EEC Directive
87/308/EEC regarding interference
suppression.
* If a car battery cord or an AC power adaptor
not manufactured by Sony is used, a fuse
must be installed in the battery cord or the
AC power adaptor and the polarity of the plug
must be as illustrated.
Notes on Batteries
¢ When the batteries are run down, the
BATTERY indicator glows faintly.
* Battery life ,
Continuous
Batteries
playback
hours
Sony batteries
SUM-3 (NS)
Sony alkaline
batteries AM3 (N)
Approx. 3.5 hrs.
Approx. 7 hrs.
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 for a long
time.
¢ 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 double-D symbol DO are trade-marks of
Dolby Laboratories Licensing Corporation.
CASSETTE PLAYER
SONY. —

Sony WM-DD11 Specifications

General

Type	Cassette Player
Brand	Sony
Model	WM-DD11
Power Supply	2 x AA batteries
Features	Dolby B Noise Reduction
Power Consumption	0.5 W
Wow and Flutter	0.1%
Playback Speed	4.76 cm/s
Frequency Response	40 - 15, 000 Hz

Summary

Specifications

Notes on Batteries

Battery life

Details continuous playback hours for different battery types.

Servicing Notes

Flexible Circuit Board Repairing

Guidelines for soldering and handling circuit boards during repair.

Notes on Chip Component Replacement

Precautions for reusing or handling chip components.

Notes on replacing the speed detection coil (FG901)

Procedure for replacing FG901, including testing and replacement strategy.

Section 1 Adjustments

Precaution

General precautions before performing adjustments.

1-1. Mechanical Adjustment

Procedures for mechanical adjustments like torque and tension.

Wow & flutter and motor position

Adjusting rotor thrust play and wow/flutter parameters.

Wow & flutter adjustment

Specific settings and procedure for wow and flutter adjustment.

1-2. Electrical Adjustments

Procedures for electrical adjustments like tape speed and azimuth.

Tape Speed Adjustment

Steps and settings for adjusting the tape speed.

Playback Head Azimuth Adjustment

Procedure to adjust the playback head for maximum output levels.

Phase Check

Procedure to check the phase relationship between channels.

Section 2 Diagrams

IC Block Diagrams

Block diagrams illustrating the internal structure of key ICs.

Section 3 Exploded Views

3-1. Cabinet

Exploded view and parts list for the unit's cabinet.

3-2. Tape Transport Mechanism (1)

Exploded view of the tape transport mechanism components.

3-3. Tape Transport Mechanism (2)

Further exploded view of tape transport mechanism parts.

Section 4 Electrical Parts List

Capacitors

List of capacitors with their part numbers and specifications.

Resistors

List of resistors with their part numbers and specifications.

Coils

List of coils with their part numbers and specifications.

Semiconductors

List of semiconductors with their part numbers and specifications.

Accessory & Packing Material