Sony WM-DDIII - User Manual

WM-Dul
SERVICE MANUAL
HEADPHONES jacks (stereo minijacks)-
REW ► ► (rewind) button'
<*4 FF (fast forward) button
<4 PLAY button
■ STOP button
Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
"DOLBY” and the double-D symbol □□ are trademarks of
Dolby Laboratories Licensing Corporation.
Refer t MDR-15L Service Manual issued previously
for informati n of headphones supplied with this set.
AEP Model
VOLUME control
BATTERY indicator
DOLBY NR switch
-TAPE selector
PHOTO: BLACK TYPE
SPECIFICATIONS
Similar Mechanism Set
WM-DD
Tape Transport Mechanism Type
DD-tOO
Tape track
4-track 2-channel stereo
Fast winding time
Approx. 2 min. with Sony Cassette C-60
Frequency response
40-15,000 Hz
Wow and flutter
±0.13% (DIN)
0.08% WRMS (NAB)
Power output
Headphones:
20mW + 20mW {at 10% harmonic distortion)
load impedance 32 ohms
at DC operation
Outputs
Two HEADPHONES jacks (stereo minijacks)
load impedance 8-300 ohms
Power requirements
3 V DC, two R6 (size AA) batteries
DC IN 3 V jack accepts:
EBP-500 battery case (optional) for use on
two R20 (size D) batteries
AC-D2M AC power adaptor (optional) for use
on 220 V AC, 50 Hz
DCC-70 or DCC-127A car battery cord (optional) for use with 12 V
car battery
(For connection with the DCC-127A, the optional PC-200 DC plug
adaptor is required.)
Battery life
Batteries
Continuous playback hours
Sony batteries SUM-3 (NS)
Approx. 4
Sony alkaline batteries AM3
Approx. 9
For maximum performance we recommend the use of alkaline
batteries.
Dimensions
Approx. 79.7x110x32.8mm (w/h/d)
(3V 4 x 4 %x 1 s / 16 inches)
incl. projecting parts and controls
Weight
Approx. 290 g (10.3 oz) incl. batteries,
not incl. other accessories
Note: 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.
FEATURES
• Disc Drive system assures accurate and stable tape trans¬
port, greatly reducing wow and flutter.
• Dolby NR system reduces tape hiss noise.
• Tape selector for optimum playback with standard tapes
as well as high-performance tapes.
• Two HEADPHONES jacks allow two persons to listen to
tape playback together.
STEREO CASSETTE PLAYER

Sony WM-DDIII Specifications

General

Brand	Sony
Model	WM-DDIII
Category	Cassette Player
Language	English

Summary

Section 1: Mechanical Operation and Disassembly

Mechanical Operation Overview

Describes that mechanical operation is the same as model WM-DD.

Disassembly Procedure

Step-by-step guide for disassembling the unit, covering panels, control panel, and chassis.

Section 3: Adjustments

Mechanical Adjustments

Covers torque measurement, pinch roller pressure, and head height adjustments.

Head Height Adjustment

Detailed steps for adjusting playback head heights for tape curl and twist.

Wow & Flutter and Motor Position

Procedure for adjusting rotor thrust play and wow & flutter.

Tape Speed Adjustment

Procedure to adjust playback speed using a frequency counter.

Playback Head Azimuth Adjustment

Steps to align the playback head for optimal stereo separation.

Playback Level Adjustment

Procedure to set playback output levels for L/R channels.

Phase Check

Verifying tape phase using an oscilloscope and test tape.

Section 4: Diagrams

Mounting Diagram

Illustrates the placement of components on the main board.

Schematic Diagram

Detailed circuit schematic of the main board.

IC Block Diagrams

Functional block diagrams for key integrated circuits.

Section 5: Exploded Views and Parts List

Exploded View and Parts List (Mechanism)

Details parts of the mechanism assembly with part numbers.

Mechanism Parts List

List of mechanism components, part numbers, and descriptions.

Mechanism Components Breakdown

Further breakdown of mechanism parts including levers, gears, and springs.

Section 6: Electrical Parts List

Electrical Components List

Comprehensive list of electrical parts, including capacitors, resistors, and semiconductors.

Accessory and Packing Material

List of accessories, packing materials, and manuals.