Sony WALKMAN WM-FS420RS User Manual

WM-FS420/FS420RS
US Model
Canadian Model
WM-FS420/FS420RS
AEP Model
E Model
WM-FS420
SERVICE MANUAL
RADIO CASSETTE PLAYER
SPECIFICATIONS
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MF-WMFS420-114
Radio Frequency FM : 87.5 – 108 MHz
AM : 530 – 1,710 kHz
(North, Central and South America)
531 – 1,602 kHz (Other countries)
Power Requirements 3 V DC Batteries R6 (AA) × 2
Dimensions (w/h/d) Approx. 108.4 × 125.7 × 47.2 mm
(4
3
/8 × 5 × 1
7
/8 inches) incl.
projecting parts and controls
Mass Approx. 280 g (9.9 oz)/Approx. 355 g (12.6 oz)
(incl. batteries and a cassette)
Supplied Accessories • Stereo headphones or earphones (1)
• Belt clip (1)
• Battery charger (1) (FS420RS only)
• Rechargeable battery
NC-WMAA, 1.2 V, 700 mAh, Ni-Cd (2) (FS420RS only)
• Rechargeable battery carrying case (1) (FS420RS only)
Design and specifications are subject to change without notice.
Ver 1.2 2001. 03
Sony Corporation
Audio Entertainment Group
General Engineering Dept.
9-927-679-12
2001C1600-1
© 2001.3

Sony WALKMAN WM-FS420RS Specifications

General

Brand	Sony
Model	WALKMAN WM-FS420RS
Category	Cassette Player
Language	English

Summary

SPECIFICATIONS

GENERAL

SERVICE NOTE

WATER PROOF SECTION

Details on protecting parts from water damage during repair.

DISASSEMBLY

MAIN ASSEMBLY

Step-by-step procedure for disassembling the main unit.

CHASSIS SUB ASSY

Procedure for disassembling the chassis sub-assembly.

MAIN BOARD AND MECHANISM DECK

Steps to separate the main board from the mechanism deck.

BELT

Instructions for accessing and replacing the drive belt.

HEAD, MAGNETIC (HP901)

Procedure for removing and replacing the magnetic playback head.

MECHANICAL ADJUSTMENT

Torque Measurement

Guidelines and specifications for measuring torque during mechanical adjustments.

ELECTRICAL ADJUSTMENT

Tape Speed Adjustment

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

TUNER SECTION

AM Tracking Adjustment

Steps for adjusting AM signal tracking for optimal reception.

AM Frequency Coverage Adjustment

Procedure to set the AM frequency coverage range.

FM Tracking Adjustment

Steps for adjusting FM signal tracking for optimal reception.

FM Frequency Coverage Adjustment

Procedure to set the FM frequency coverage range.

DIAGRAMS

IC BLOCK DIAGRAMS

Block diagrams illustrating the internal structure of key ICs.

BLOCK DIAGRAM

Overall functional block diagram of the device.

SCHEMATIC DIAGRAM

Detailed electrical schematic of the device's circuitry.

PRINTED WIRING BOARD

Layout of components and traces on the printed circuit boards.

IC PIN FUNCTION DESCRIPTION

Detailed pin assignments and functions for integrated circuits.

MAIN BOARD SECTION

MECHANISM DECK SECTION-1

MECHANISM DECK SECTION-2

ELECTRICAL PARTS LIST

REVISION HISTORY