Sony TC-WE625 Service Manual

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Model Name Using Similar
Mechanism
TC-WE505/WE605S/WE705S
TC-WE625 :TCM-190RB12CL
DECK A TC-WE725/WE825S :
Tape Transport TCM-190RB13C
Mechanism Type TC-WE625 :TCM-190RB12CL
DECK B TC-WE725/WE825S :
TCM-190RB11C
SERVICE MANUAL
US Model
TC-WE625/WE825S
Canadian Model
TC-WE625
AEP Model
UK Model
TC-WE725/WE825S
E Model
Australian Model
Chinese Model
TC-WE625
TC-WE625/WE725/
WE825S
STEREO CASSETTE DECK
MICROFILM
System
Recording system
4-track 2-channel stereo
Fast-winding time (approx.)
90 sec. (with Sony C-60 cassette)
High-speed fast-winding time (approx.) (TC-WE825S and TC-WE725
only)
45 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
With Dolby S NR on (TC-WE825S only): 10 dB at 100 Hz,
24 dB at 1 kHz
SPECIFICATIONS
– Continued on next page –
Photo: TC-WE825S
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.
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.)
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),
30-13,000 Hz (±3 dB, –4 dB
recording)

Sony TC-WE625 Specifications

General

Brand	Sony
Model	TC-WE625
Category	Cassette Player
Language	English

Summary

SPECIFICATIONS

System and Performance Specifications

Details on recording system, tape speed, bias, distortion, and frequency response.

SAFETY CHECK-OUT

Leakage Test Procedure

How to perform AC leakage tests on exposed metal parts.

Safety Component Warning

Warning about critical components for safe operation.

Mechanical Adjustments

Torque Measurement Specifications

Torque meter readings for various operational modes.

Electrical Adjustments

Electrical Adjustment Precautions

Precautions and setup for electrical adjustments.

Head Adjustments

Record/Playback Head Azimuth Adjustment

Procedure for adjusting record/playback head azimuth.

Tape Speed Adjustment

Procedure for adjusting tape speed.

Playback Level Adjustment

Procedure for adjusting playback level.

Bias and Level Adjustments

Bias Consumption Current Adjustment

Adjustment for bias consumption current.

Record Level Adjustment

Procedure for setting record level.

Record Bias Adjustment

Procedure for adjusting record bias.

IC Pin Descriptions

System Controller IC Pin Details

Detailed pin description for the system controller IC.

Deck A Section Diagrams

Deck A Printed Wiring Boards

Printed wiring board layouts for Deck A.

Deck A Schematic Diagram

Schematic diagram for Deck A.

Deck B Section Diagrams

Deck B Printed Wiring Boards

Deck B Schematic Diagram

Dolby-S Section Diagrams

Dolby-S Printed Wiring Board

Dolby-S Schematic Diagram

Exploded Views

Case Section Exploded View

Chassis Section Exploded View

Chassis Assembly Exploded View

Cassette Holder Section Exploded View

Cassette Holder Exploded View

Front Panel Section Exploded View

Front Panel Assembly Exploded View

Tape Mechanism Section 1 Exploded View

Tape Mechanism Part Details (Section 1)

Tape Mechanism Section 2 Exploded View

Tape Mechanism Part Details (Section 2)

Electrical Parts List

Audio (A) Board Parts

List of electrical components for the Audio (A) board.

Audio (A) and (B) Board Parts

Audio (A) Board Components

List of components for the Audio (A) board.

Audio (B) Board Components

List of components for the Audio (B) board.

Dolby-S Board Parts

Dolby-S Board Components

List of electrical components for the Dolby-S board.

Dolby-S and FL Board Parts

Dolby-S Board Components List

FL Board Components List

Headphone and Leaf Switch Board Parts

Headphone Board Components

Leaf SW (A) Board Components

Leaf SW (B) Board Components

Main Board Parts List

Main Board Capacitors

Main Board Connectors

Main Board Diodes

Main Board Transistors and Resistors

Main Board Transistors

Main Board Resistors

REC VOL Board Parts

REC VOL Board Transistors

REC VOL Board Resistors

REC VOL Board Variable Resistors

Circuit Board Parts Lists

SW (A), SW (B), SW (C) Board Components

TRANS (A) and TRANS (B) Board Components