Sony WM-GX221 User Manual

WM-GX221
US Model
Canadian Model
E Model
Chinese Model
SERVICE MANUAL
RADIO CASSETTE-CORDER
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
9-873-412-03
2004D16-1
© 2004.04
SPECIFICATIONS
Ver 1.2 2004.04
Model Name Using Similar Mechanism New
Tape Transport Mechanism Type MT-WMGX221-175
Frequency range
FM: 87.5-108 MHz (Italy and Saudi Arabia)
87.6-108 MHz (North, Central and South America)
87.6-107.9 MHz (Other countries)
AM: 526.5-1 606.5 kHz (Italy and Saudi Arabia)
530-1 710 kHz (North, Central and South America)
531-1 602 kHz (Other countries)
Frequency response Playback: 40 - 15 000 Hz
Recording: 100 - 8 000 Hz (when
setting 2x REC TIME to NORM)
Input Microphone (MIC) jack
Output Headphones (
i
) jack
Load impedance 8 - 300 Ω
Power requirements 3 V DC batteries R6 (size AA)
× 2
External DC 3V power sources
Dimensions (w/h/d) Approx. 112.0
× 82.5 × 38.0 mm
(4
1
/
2
× 3
1
/
4
× 1
1
/
2
inches), excl.
projecting parts and controls
Mass Approx. 190 g (6.8oz) (main unit
only)
Supplied accessories Stereo headphones or earphones (1)
Stereo microphone (1)
Carrying case (1)
Design and specifications are subject to change without notice.
Battery life (Approx. hours) (JEITA*)
Sony alkaline LR6(SG) ** Sony R6P(SR)
(using headphones/earphones)
playback 24 7
radio 48 15
mic recording 20 4.5
radio recording 12 3
(using the speakers)
playback 15 4.5
radio 26 6
radio recording 11.5 3
*Measured value by the standard of JEITA (Japan
Electronics and Information Technology Industries
Association) (using a Sony HF series cassette tape).
**When using Sony LR6(SG) “STAMINA” alkaline dry
batteries (produced in Japan).
Note
•The battery life may be shorter depending on the
operating condition, the surrounding temperature
and battery type.

Sony WM-GX221 Specifications

General

Type	Cassette Player
Brand	Sony
Model	WM-GX221
Power Supply	2 x AA batteries
Recording	No
Headphones Output	3.5 mm
Radio	Yes
Playback Functions	Play, Stop, Fast Forward, Rewind

Summary

Specifications

Service Note

General Information

Location of Controls

Identifies and illustrates the various buttons and controls on the device.

Disassembly Procedures

Panel and Cabinet Assembly Removal

Step-by-step guide for removing the front panel and cabinet assembly.

Main Board and Mechanism Deck Disassembly

Instructions for disassembling the main board and mechanism deck.

Head, Motor, and Belt Removal

Details on disassembling heads (HE901, HRP901), motor (M601), and belts.

Sub Board Removal

Procedure for removing the sub board.

Mechanical Adjustments

Torque Measurement

Procedures and specifications for measuring torque on various modes.

Electrical Adjustments

Switch and Control Position Settings

Specifies the correct switch and control settings for adjustments.

Tape Speed Adjustment

Detailed steps for adjusting tape playback and recording speed.

Tuner Section Adjustments

Procedures for adjusting AM/FM frequency coverage, tracking, and IF.

Diagrams and Schematics

Tuner Section Block Diagram

Block diagram illustrating the tuner section circuitry.

Main Section Block Diagram

Block diagram illustrating the main section circuitry.

Printed Wiring Boards

Illustrations of the printed wiring board layouts.

Main Board Schematic Diagram (Part 1)

Part one of the schematic diagram for the main circuit board.

Main Board Schematic Diagram (Part 2)

Part two of the schematic diagram for the main circuit board.

Integrated Circuit Block Diagrams

Block diagrams illustrating the internal functions of key integrated circuits.

Exploded Views

Overall Unit Exploded View

Exploded view of the entire unit, showing major assemblies.

Front Cabinet Section Exploded View

Exploded view of the front cabinet and related components.

Mechanism Deck Block 1 Exploded View

Exploded view of the first part of the mechanism deck.

Mechanism Deck Block 2 Exploded View

Exploded view of the second part of the mechanism deck.

Electrical Parts List