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Sony WM-DD - Service Manual

Sony WM-DD
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SPECIFICATIONS
Power
Requirements:
3
V
dc
Internal
batteries:
IEC
designation
R6
(size
A
A)
x
2
AC
power
adaptor:
Refer
to
the
following
chart
to
choose
the
correct
adaptor
for
your
area.
Country
Ac
power
line
voltage
Optional
ac
power
adaptor
US
Canadian
120
Vac,
60
Hz
AC-39
available
in
the
U.S.A.
and
Canada
UK
240
Vac,
50
Hz
AC-37
available
in
the
United
Kingdom
AEP
220
V
ac,
50
Hz
AC-37
available
in
European
countries
E
120
Vac,
(110,220
or
240
V
ac,
adjustable
by
Sony
personnel),
50/60
Hz
110,120,
220
or
240
V
ac,
adjustable,
50/60
Hz
AC-38
available
in
Japan
AC-38
available
in
other
countries
12
V
car
battery:
Sony
DCC-127A*
car
battery
cord
*For
connection
with
the
DCC-127A,
the
optional
PC-
200
dc
plug
adaptor
is
required.
Battery
Life
(continuous
playback
hours):
Approx.
9
hours
with
supplied
Sony
Eveready
AM3
alkaline
batteries
For
maximum
performance
we
recommend
the
use
of
alkaline
bat¬
teries.
Dimensions:
Approx.
79
x
109.2
x
29
mm
(w/h/d)
(3i/s
x4s/
16
x
13/ie
inches)
not
incl.
projecting
parts
and
controls
Weight:
Approx.
290g
(IO
1
/4
oz)
incl.
batteries,
not
inch
other
accessories
MICROFILM
Tape
Track:
Fast
Winding
Time:
Frequency
Response:
Wow
and
Flutter:
Power
output:
Output:
4-track
2-channel
stereo
Approx.
2min.
with
Sony
Cassette
C-60
40
15,000
Hz
(with
the
TAPE
selector
+
tn
METAL*
set
t0
CrOj
1
40
12,000
Hz
(with
the
TAPE
selector
set
to
NORM)
±0.13%
(DIN)
0.08%
WRMS
(NAB)
25
mWx
2
(max.)
20
mW
x
2
(at
10%
harmonic
distortion)
at
dc
operation
Headphone
jacks
(stereo
minijack)
...
2
load
impedance
8
300
ohms
Tape
Transport
Mechanism
Type
MT-WMDD-24
SERVICE
MANUAL
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Sony WM-DD Specifications

General IconGeneral
BrandSony
ModelWM-DD
CategoryCassette Player
LanguageEnglish

Summary

Specifications

Power Requirements

Details power sources, including AC adaptors for various countries.

Performance Specifications

Covers tape format, winding time, frequency response, wow/flutter, and output.

Parts Identification

External Component Locations

Illustrates and labels key external components of the player.

Key Features

Highlights major functional capabilities like tape selection and DD system.

Chip Component Details

Component Dimensions and Identification

Provides dimensions and visual identification for resistors, capacitors, transistors, and diodes.

Chip Component Replacement

Safety and Handling Precautions

Lists essential safety and handling guidelines for component replacement.

Removal and Connection Procedures

Details the methods for removing and connecting chip components.

System Block Diagram

Signal Flow Overview

Illustrates the overall system architecture and signal paths.

Power Supply and Battery Circuitry

Shows the DC IN and battery power supply connections.

Mechanical Operation Modes

Forward (FWD) Mode Operation

Explains the mechanical steps for forward playback.

FWD Mode Auto Shut-off

Mechanism Description

Describes the mechanism for automatic shut-off during forward playback.

FF and REW Mode Operations

Fast Forward (FF) Mode Operation

Details the mechanical sequence for fast forward playback.

Rewind (REW) Mode Operation

Explains the mechanical steps for rewind operation.

Motor Section Installation

Installation and Adjustment Procedures

Guides motor installation, alignment, and thrust play adjustment.

Electrical Adjustments

Head Height Adjustment

Details the procedure for adjusting playback head height for optimal performance.

Playback Head Azimuth Adjustment

Explains how to align the playback head for optimal stereo separation.

Phase Check and Adjustment

Describes how to check and adjust signal phase using an oscilloscope.

Adjustment Location Identification

Shows the physical locations of adjustment screws on the unit.

Disassembly Procedure

Cassette Panel and Holder Removal

Details steps for removing the cassette panel and holder.

Control Panel and Audio Board Access

Explains how to access the control panel and audio board.

Mechanism Section Access

Guides on how to access the mechanism section for inspection.

Mechanical Adjustments

Torque Measurement

Provides specifications and methods for measuring component torque.

Pinch Roller Pressure Adjustment

Details the procedure for adjusting pinch roller pressure.

Electrical Adjustment Details

Tape Speed Adjustment

Guides on adjusting tape speed using a speed checker or frequency counter.

Channel Level Adjustment

Details how to adjust audio channel levels for balance.

Muting Level Adjustment

Explains the procedure for adjusting the muting circuit level.

Wow and Flutter Adjustment

Describes how to adjust wow and flutter using an oscilloscope.

Diagrams and Layouts

Semiconductor Lead Layouts

Shows the pinout and lead configurations for various semiconductors.

Exploded Views and Parts List

Mechanism Exploded View

Provides a detailed exploded diagram of the player's mechanism.

Chassis Exploded View

Shows an exploded view of the main chassis and associated parts.

Schematic Diagram

Main Board Circuit Diagram

Presents the detailed circuit schematic for the main board.

Component Notes and Voltages

Provides general notes on components and DC voltage readings.

General Section Parts List

Panel and Knob Components

Lists parts for panels, buttons, knobs, and springs.

Screws and Cushion Parts

Details screws, springs, cushions, and meter covers.

Accessory and Packing Material

Carrying Cases and Cartons

Lists accessories like carrying cases, cartons, and cushions.

Labels, Manuals, and Tapes

Includes product labels, manuals, demonstration tapes, and protection sheets.

Mechanical Section Parts List

Shut-off and Gear Components

Lists levers, gears, plates, and springs for mechanical functions.

Motor and Tension Components

Details motor brackets, plates, rubbers, retainers, and springs.

Assorted Screws and Assemblies

Lists various precision screws, washers, and specific component assemblies.

Electrical Parts List

Capacitors and Resistors

Lists capacitors (ceramic, electrolytic) and resistors (carbon chip).

Semiconductors, Jacks, and Switches

Details transistors, diodes, ICs, jacks, and switches.

Electrical Parts List (Continued)

Resistors and Variable Components

Lists remaining resistors, variable resistors, and switches.

Hardware Nomenclature

Screw and Fastener Definitions

Defines common screw types, dimensions, and head styles.

Washer and Retaining Ring Types

Defines different types of washers and retaining rings.

Capacitor Specifications

Electrolytic and Ceramic Capacitors

Lists electrolytic and ceramic capacitors with their ratings and part numbers.

Capacitor Specifications (Continued)

Mylar and Tantalum Capacitors

Lists Mylar and Tantalum capacitors with their voltage ratings and part numbers.

Mechanical Section Parts List (Continued)

Shut-off and Gear Components

Lists levers, gears, plates, and springs for shut-off and driving mechanisms.

Motor and Tension Components

Details motor plates, retainers, springs, and tension components.

Assorted Fasteners and Assemblies

Lists various screws, washers, springs, and specific component assemblies.

Electrical Parts List (Continued)

Resistors (Continued)

Lists remaining resistors, including carbon chip types with specific values.

Variable Resistors, Switches, and Motors

Details variable resistors, switches, and motors with their part numbers.

Electrical Parts List (Continued)

Resistors (Continued)

Lists remaining carbon chip resistors with their specifications.

Variable Resistors, Switches, and Motors (Continued)

Details variable resistors, switches, and motors with their part numbers.

Hardware Nomenclature (Continued)

Screw and Fastener Definitions

Defines common screw types, dimensions, and head styles.

Washer and Retaining Ring Types

Defines different types of washers and retaining rings.

Capacitor Specifications (Continued)

Electrolytic and Ceramic Capacitors (Continued)

Lists electrolytic and ceramic capacitors with their voltage ratings and part numbers.

Capacitor Specifications (Continued)

Mylar and Tantalum Capacitors (Continued)

Lists Mylar and Tantalum capacitors with their voltage ratings and part numbers.

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