Sony TC-WE525 Service Manual

– 1 –
Model Name Using Similar
Mechanism
NEW
Tape Transport DECK A TCM-230ASR1
Mechanism Type DECK B TCM-230ASR2
SERVICE MANUAL
US Model
TC-WE425/WR681
Canadian Model
TC-WE425
AEP Model
TC-WE525/WR681
UK Model
TC-WE525
E Model
Australian Model
TC-WE425/WR681
Chinese Model
TC-WE425
TC-WE425/WE525/
WR681
STEREO CASSETTE DECK
MICROFILM
System
Recording system
4-track 2-channel stereo
Fast-winding time (approx.)
100 sec. (with Sony C-60 cassette)
Bias
AC bias
Signal-to-noise ratio (at peak level and weighted with Dolby NR off)
Type I tape, Sony Type I (NORMAL): 55 dB
Type II tape, Sony Type II (HIGH): 57 dB
Type IV tape, Sony Type IV (METAL): 58 dB
S/N ratio improvement (approximate values)
With Dolby B NR on: 5 dB at 1 kHz, 10 dB at 5 kHz
With Dolby C NR on: 15 dB at 500 Hz, 20 dB at 1 kHz
Harmonic distortion
0.4% (with Type I tape, Sony Type I (NORMAL):
160 nWb/m 315 Hz, 3rd H.D.)
1.8% (with Type IV tape, Sony Type IV (METAL):
250 nWb/m 315 Hz, 3rd H.D.)
SPECIFICATIONS
– Continued on next page –
Photo: TC-WE425
Dolby noise reduction extension manufactured under license
from Dolby Laboratories Licensing Corporation.
HX Pro originated by Bang & Olufsen. “DOLBY”, the double-D
symbol a and “HX PRO” are trademarks of Dolby Laboratories
Licensing Corporation.
Frequency response (Dolby NR off)
Tape type
Type I tape, Sony Type I 30-16,000 Hz (±3 dB, IEC),
(NORMAL) 20-17,000 Hz (±6 dB)
Type II tape, Sony Type II 30-17,000 Hz (±3 dB, IEC),
(HIGH) 20-18,000 Hz (±6 dB)
Type IV tape, Sony Type IV 30-19,000 Hz (±3 dB, IEC),
(METAL) 20-20,000 Hz (±6 dB),
Wow and flutter
± 0.15% W. Peak (IEC)
0.1% W. RMS (NAB)
± 0.2% W. Peak (DIN)

Sony TC-WE525 Specifications

General

Track System	4-track, 2-channel stereo
Tape Speed	4.8 cm/s
Motor	DC Servo Motor
Signal to Noise Ratio (Normal Tape)	58dB
Power Supply	AC 120V, 60Hz
Type	Double Cassette Deck
Frequency Response (Normal Tape)	30 Hz - 14 kHz
Frequency Response (Chrome Tape)	30 Hz - 16 kHz
Frequency Response (Metal Tape)	30Hz to 17kHz
Wow and Flutter	0.08% (W.R.M.S.)
Inputs	Line In
Outputs	Line Out, Headphone
Dimensions	430 x 120 x 300mm

Summary

Product Specifications

System and Performance Specifications

Details recording system, fast winding, bias, S/N ratio, and harmonic distortion.

Frequency Response and Wow/Flutter Performance

Specifies frequency response range and wow/flutter measurements.

Service and Safety Information

Input/Output, Power, and General Specs

Covers line inputs/outputs, power requirements, dimensions, mass, and accessories.

Safety Check-out and Leakage Test Procedure

Outlines safety checks, including AC leakage testing methods.

Model Identification

Model Identification and Part Number Mapping

Cross-references part numbers with corresponding model designations.

Front Panel Controls

Control Layout and Function Descriptions

Identifies and describes front panel buttons, switches, and indicators.

Disassembly Procedures

Case and Front Panel Disassembly

Step-by-step instructions for removing the external case and front panel.

Cassette Lid and Mechanism Deck Removal

Procedures for removing the cassette lid and main mechanism deck assemblies.

Leaf Switch Board Removal

Instructions for removing leaf switch boards for Deck A and Deck B.

Pinch Lever and Flywheel Assembly Disassembly

Guides for disassembling pinch lever and flywheel assemblies for both decks.

Mechanical Block and Head Relay Board Removal

Steps for disassembling the mechanical block and head relay boards.

Adjustment Procedures

Mechanical Adjustments and Torque Specifications

Details mechanical adjustments and required torque measurements for service.

Electrical Adjustments and Test Setup

Covers electrical adjustments, test signal levels, and test modes.

Head and Level Adjustments

Record/Playback Head Azimuth Alignment

Procedure for correctly aligning the record/playback head azimuth.

Tape Speed and Playback Level Calibration

Steps for calibrating tape speed and playback level for optimal performance.

Deck B Specific Adjustments

Bias Consumption Current Adjustment

Adjustment procedure for bias consumption current on Deck B.

Record Level and Bias Adjustment

Details record level and record bias adjustments for Deck B.

Circuit Diagrams and Pinouts

IC Pin Descriptions and Functions

Pinouts and descriptions for system controller IC801.

Circuit Board Locations

Printed Wiring Board and Schematic Notes

Explains common notes for printed wiring boards and schematic diagrams.

Main Section Printed Wiring Boards

Main Board Printed Wiring Diagram

Printed wiring board layout for the main section of the device.

Main Section Schematic Diagrams

Main Board Schematic (1/3)

Part 1 of the main board schematic diagram.

Main Board Schematic (2/3)

Part 2 of the main board schematic diagram.

Main Board Schematic (3/3)

Part 3 of the main board schematic diagram.

Panel Section Printed Wiring Boards

Panel Board Wiring Layouts

Printed wiring board layouts for display, power, direction, and recvol boards.

Panel Section Schematic Diagrams

Panel Board Schematic Diagrams

Schematic diagrams for the panel section boards.

Power Section Printed Wiring Boards

Power Supply Board Wiring Layouts

Printed wiring board layouts for power supply boards.

Power Section Schematic Diagrams

Power Supply Schematic Diagrams

Schematic diagrams for the power supply section.

Deck Section Printed Wiring Boards

Deck A Leaf Switch Board Layout

Printed wiring board layout for Deck A's leaf switch board.

Deck B Leaf Switch Board Layout

Printed wiring board layout for Deck B's leaf switch board.

Exploded Views

Case Section Exploded View

Exploded view diagram of the unit's external case.

Chassis Section Exploded View

Exploded view diagram of the unit's internal chassis.

Cassette Holder Section Exploded View

Exploded view diagram of the cassette holder assembly.

Front Panel Section Exploded View

Exploded view diagram of the front panel assembly.

Tape Mechanism Section Exploded View

Exploded view diagram of the tape mechanism section.

Electrical Parts List

Resistors and Switches Parts List

Lists resistors, variable resistors, and switches with part numbers.

Capacitors, Connectors, ICs, and Diodes Parts List

Lists capacitors, connectors, ICs, and diodes with part numbers.

Accessories and Hardware

Connection Cords and Manuals List

Lists included connection cords and instruction manuals for various regions.

Hardware List (Screws and Lugs)

Lists common hardware items such as screws and lugs used in assembly.