Sony Walkman WM-DD 3 - User Manual

SERVICE MANUAL
HEADPHONES jacks (stereo minijacks)
REW 11+ (rewind) button
~ FF (fast forward) button
~ PLAY button
• STOP button
Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
"DOLBY" and the double-D symbol DO are trademarks of
Dolby Laboratories Licensing Corporation.
WM-DDill
Refer t MDR-15L Service Manual issued previously
for informati n
of headphones supplied with this set.
PHOTO: BLACK TYPE
AEP Model
VOLUME control
BATTERY indicator
DOLBY NR switch
TAPE selector
SPECIFICATIONS
Similar Mechanism Set WM-00
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:
20 mW + 20 mW (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.
Tape Transport Mechanism Type
Dimensions
Approx.
79.7x110x32.8mm (w/h/d)
(3
1
/
4
x43fax 1
5
/
16
inches)
incl.
projecting parts and controls
Weight
Approx.
290 g (10.3 oz) incl. batteries,
not
incl. other accessories
00-100
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.
Apple Inc., et al.
Exhibit 1010
Apple Inc., et al. v. Global Touch Solutions, Inc.
IPR2015-01174
Exhibit 1010, Page 001
f
Find authenticated court documents without watermarks at docketalarm.com.

Sony Walkman WM-DD 3 Specifications

General

Type	Portable Cassette Player
Model	WM-DD3
Brand	Sony
Features	Dolby B Noise Reduction
Motor	DC motor
Power Source	2 x AA batteries
Playback Speed	1.875 ips

Summary

Service Manual Overview

Headphone Jacks

Details on stereo minijacks for headphone connection.

Technical Specifications

Key technical details including tape, frequency response, power, and dimensions.

Key Features

Highlights of the device's capabilities, such as Disc Drive and Dolby NR.

Replacing Chip Components

Component Replacement Precautions

Important warnings and guidelines before removing or replacing chip components.

Connecting Chip Components

Step-by-step instructions for connecting new chip components, including soldering.

Mechanical Operation and Disassembly

Disassembly Procedure

Detailed steps for taking the device apart, with diagrams for control and cassette panels.

Reassembly Notes

Instructions for reassembling the control panel and mechanical unit.

Adjustments Section

Adjustment Precautions

General safety and operational precautions to follow before making adjustments.

Mechanical Adjustments

Procedures for torque measurement, head height, and pinch roller pressure.

Head Height Adjustment Procedure

Steps to adjust head height for optimal tape playback and eliminate curl/twist.

Pinch Roller Pressure Adjustment

Method for measuring and adjusting pinch roller pressure for playback mode.

Motor Section and Speed Adjustments

Motor Section Installation

Detailed steps for correctly installing the motor section into the device.

Wow & Flutter Adjustment

Procedure to minimize wow and flutter by adjusting motor position and related screws.

Electrical Adjustments

Tape Speed Adjustment

Procedure to adjust tape speed using a frequency counter and test tape.

Playback Head Azimuth Adjustment

Steps to align playback head azimuth for optimal stereo separation and sound quality.

Phase Check Procedure

Method for checking audio phase using an oscilloscope and specific test tape.

Diagrams and Component Locations

Semiconductor Lead Layouts

Visual representation of pin configurations for various semiconductor components.

Semiconductor Locations

Reference chart showing the placement of semiconductor components on the circuit boards.

Schematic Diagram

Schematic Diagram Notes

Important information regarding capacitor and resistor specifications used in the schematic.

Integrated Circuit (IC) Block Diagrams

Key IC Block Diagrams

Detailed internal block diagrams for IC301, IC302, IC303, IC601, and IC602.

Exploded Views and Parts List

Exploded View Notes

Explanations for part numbering, stocking status, and appearance color indications.

Exploded View of Components

Detailed illustration of device components with their corresponding part numbers.

Parts List

Comprehensive list of all parts, their part numbers, descriptions, and remarks.