Sony WM-FX477 User Manual

– 1 –
MICROFILM
SERVICE MANUAL
US Model
Canadian Model
AEP Model
E Model
Chinese Model
WM-FX477/FX479
RADIO CASSETTE PLAYER
Photo: WM-FX477
Radio section
Frequency range
FM: 65 – 74/87.5 – 108 MHz (East
European)
87.5 – 108 MHz (Except East European)
AM:530 – 1,710 kHz (US, Canadian)
531 – 1,602 kHz (Except US, Canadian)
Tape section
Frequency response
(Dolby NR off)
Playback: 30 – 14,000 Hz
Output
Headphones/earphones (2 jack)
Load impedance 8 – 300 ohms
General
Power requirements
3 V DC batteries R6 (AA) × 2/
External DC 3 V power sources
Dimensions (w/h/d)
Approx. 115.8 × 85 × 33.4 mm
(4 5/8 × 3 3/8 × 1 3/8 inches) incl.
projecting parts and controls
Mass
Approx. 175 g (6.2 oz.)/Approx.
255 g (9.0 oz.) incl.batteries and a
cassette
Supplied accessories
Stereo headphones or Stereo
earphones (1)
Carrying case (1)
Design and specifications are subject to change without
notice.
SPECIFICATIONS
Model Name Using Similar Mechanism WM-FX483
Tape Transport Mechanism Type MF-WMFX483-147
Notes on Chip Component Replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Dolby noise reduction manufactured under license from Dolby Labo-
ratories Licensing Corporation.
“DOLBY” and the double-D symbol a are trademarks of Dolby
Laboratories Licensing Corporation.
Ver 1.0 1999. 02

Sony WM-FX477 Specifications

General

Brand	Sony
Model	WM-FX477
Category	Cassette Player
Language	English

Summary

Section 1 General

Operating the Walkman

Instructions for operating the Walkman, including tape playback and radio functions.

Radio Operation Guide

Guide to turning on the radio, selecting bands, and tuning stations.

Section 2 Disassembly

2-1. Cabinet (Front) Assy

Procedure for removing the front cabinet assembly, including releasing claws.

2-2. Display Board

2-3. Holder (Sub) Assy, Cassette

2-4. Main Board

Steps to access and remove the main circuit board.

2-5. Mechanism Deck

Guide for removing the tape mechanism deck.

2-6. Belt and Motor

Section 3 Mechanical Adjustments

Torque Measurement

Section 4 Electrical Adjustments

Tape Speed Adjustment

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

Tuner Section Adjustments

Procedures for adjusting FM and AM tuner sections.

Section 5 Diagrams

5-1. IC Pin Description

5-2. Block Diagram

Overall system block diagram illustrating signal flow.

5-3. Schematic Diagram - Main Section

Detailed schematic of the main board circuitry.

5-4. Printed Wiring Board - Main Section

Printed wiring layout for the main board.

5-5. Printed Wiring Board - Display Section

Printed wiring layout for the display board.

5-6. Schematic Diagram - Display Section

Detailed schematic of the display board circuitry.

Section 6 Exploded Views

6-1. Cabinet Section

6-2. Tape Mechanism Deck Section

Exploded view of the tape mechanism deck and its components.

Section 7 Electrical Parts List