Sony WM-EX651 User Manual

WM-EX651
E Model
Chinese Model
SERVICE MANUAL
CASSETTE PLAYER
SPECIFICATIONS
Model Name Using Similar Mechanism WM-EX631
Tape Transport Mechanism Type MT-WMEX610-162
Ver 1.0 2004.09
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
9-879-142-01
2004I02-1
© 2004.09
Frequency response
Playback: 30 - 18 000 Hz
Output
Headphones (i jack)
Load impedance 8 - 300 Ω
Power requirements
• One rechargeable battery: 1.2V DC x 1
• One R6 (size AA) battery: 1.5 V DC x 1
For charging stand (DC IN 3 V jack)
• AC power adaptor
Dimensions (w/h/d)
Approx. 76.4 x 108.9 x 21.8 mm(excl. projecting parts and
controls)
Mass
Approx. 140 g (main unit only)
Supplied accessories
• Battery case (1)
• AC power adaptor (1)
• Charging stand (1)
• Stereo headphones or earphones with remote control (1)
• Rechargeable battery (NH-10WM, 1.2 V, 900 mAh (MIN), Ni- MH) (1)
• Carrying pouch (1)
• Rechargeable battery carrying case (1)
• AC plug adaptor (1) (“Sony world model” only)
Design and specifications are subject to change without notice.

Sony WM-EX651 Specifications

General

Type	Cassette Player
Brand	Sony
Model	WM-EX651
Power Supply	2 x AA Batteries
Mega Bass	Yes
AVLS (Automatic Volume Limiter System)	Yes
Remote Control	No
Battery Life	Approx. 24 hours playback
Features	Auto Reverse
Frequency Response	40 Hz - 15 kHz (with Dolby B NR)
Weight	160 g (without batteries)

Summary

Service Notes and Precautions

Chip Component Replacement Notes

Flexible Circuit Board Repair

Unleaded Solder Handling

Safety-Related Component Warnings

Critical safety warnings for specific components.

Component Disassembly Guide

Disassembly Flow Chart

Visual guide outlining the sequence of disassembly steps.

Case Assembly Removal

Instructions for removing the main case components.

Main Board Removal

Detailed steps for removing the main board from the unit.

Belt (F4) Replacement

Motor (Capstan/Reel) Removal

Cassette Lid Assembly Removal

Pinch Lever Removal

Magnetic Head Removal

Procedure for removing the magnetic playback head (HP901).

Mechanical Adjustment Procedures

Torque Measurement Details

Details on measuring torque for various modes (FWD, REV, FF/REW).

Electrical Adjustment Procedures

Tape Speed Adjustment

Steps to adjust tape speed using a frequency counter and RV601.

Technical Diagrams and Schematics

IC Block Diagrams

System Block Diagrams

Main Board Schematic (Part 1)

Main Board Schematic (Part 2)

IC Pin Function Descriptions

Detailed description of pin functions for integrated circuits.

Exploded Parts Views

Case Section Exploded View

Exploded view of the unit's case and related parts.

Main Board Section Exploded View

Exploded view of the main board assembly.

Mechanism Deck Exploded View (Part 1)

Mechanism Deck Exploded View (Part 2)

Electrical Component List