Sony WE475 - TC Dual Cassette Deck User Manual

Model Name Using Similar Mechanism TC-WE435
DECK A TCM-230ASR41A
DECK B TCM-230ASR41B
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
STEREO CASSETTE DECK
SPECIFICATIONS
Dolby noise reduction extension manufactured under license
from Dolby Laboratories Licensing Corporation.
HX Pro originated by Bang & Olufsen. “DOLBY”, the double-D
symbol ; and “HX PRO” are trademarks of Dolby Laboratories
Licensing Corporation.
TC-WE475
— Continued on next page —
Transport Mechanism Type
Ver 1.0 2001.04
Sony Corporation
Home Audio Company
Shinagawa Tec Service Manual Production Group
9-873-893-11
2001D0900-1
© 2001. 4
SERVICE MANUAL
System
Fast-winding time
Approx.100 sec. (with Sony C-60 cassette)
Signal-to-noise ratio (at peak level and weighted with Dolby
NR off)
55 dB, using Sony TYPE I cassette
57 dB, using Sony TYPE II cassette
58 dB, using Sony TYPE IV cassette
S/N ratio improvement
With Dolby B NR on:
Approx. 5 dB at 1 kHz, 10 dB at 5 kHz
With Dolby C NR on:
Approx. 15 dB at 500 Hz, 20 dB at 1 kHz
Harmonic distortion
0.4% (using Sony TYPE Icassette):
160 nWb/m 315 Hz, 3rd H.D.)
1.8% (using Sony TYPE IV cassette):
250 nWb/m 315 Hz, 3rd H.D.)
Frequency response (DOLBY NR OFF)
30-16,000 Hz (±3 dB, IEC), 20-17,000 Hz
(±6 dB), using Sony TYPE I cassette
30-17,000 Hz (±3 dB, IEC), 20-18,000 Hz
(±6 dB), using Sony TYPE II cassette
30-19,000 Hz (±3 dB, IEC), 20-20,000 Hz
(±6 dB), 30-13,000 Hz (±3 dB, –4dB recording),
using Sony TYPE IV cassette
Wow and flutter
±0.15% W. Peak (IEC)
0.1% W. RMS (NAB)
±0.2% W. Peak (DIN)
Variable pitch range
Approx. –30 to +30 %
Inputs
Line inputs (phono jacks)
sensitivity 0.16 V, input impedance 47 kilohms
Outputs
Line outputs (phono jacks)
rated output level 0.5 V at a load impedance of
47 kilohms, load impedance over 10 kilohms
Headphones (stereo phone jack)
output level 0.25 mW at a load impedance of
32 ohms

Sony WE475 - TC Dual Cassette Deck Specifications

General

Track System	4-track, 2-channel stereo
Tape Speed	4.8 cm/s
Noise Reduction	Dolby B
Type	double cassette deck
Signal to Noise Ratio	58dB
Cassette Support	Chrome
Outputs	line
Power Supply	220V

Summary

Specifications

System Specifications

Details tape speed, signal-to-noise ratio, harmonic distortion, and frequency response.

Wow and Flutter

Section 3 Service Mode

Key Check and Display Check Mode

Instructions for entering and using service mode for diagnostics and checks.

Section 4 Mechanical Adjustments

Torque Measurement

Specifies torque values for various mechanical adjustments like capstan and pinch roller.

Section 5 Electrical Adjustments

Record Mode Setup

Test Tape Requirements

Test Mode Operation

Details on entering and using the unit's special test mode for calibration.

Record/Playback Head Azimuth Adjustment

Procedure for adjusting head azimuth for optimal audio playback quality.

Tape Speed Adjustment

Steps for calibrating the tape playback speed to specified frequencies.

Playback Level Adjustment

Procedure for setting the output playback signal level to a standard reference.

Bias Consumption Current Adjustment

Adjusting bias current for head replacement or oscillator transformer.

Record Level Adjustment

Procedure for setting the record input signal level for optimal recording.

Record Bias Adjustment

Adjusting bias for optimal recording performance and frequency response.

Section 6 Diagrams

Circuit Boards Location

Printed Wiring Board - Main Section

Detailed printed wiring board layout for the main control section.

Schematic Diagram - Main (1/4) Section

Part 1 of the main section schematic diagram illustrating circuit connections.

Schematic Diagram - Main (2/4) Section

Part 2 of the main section schematic diagram illustrating circuit connections.

Schematic Diagram - Main (3/4) Section

Part 3 of the main section schematic diagram illustrating circuit connections.

Schematic Diagram - Main (4/4) Section

Part 4 of the main section schematic diagram illustrating circuit connections.

Printed Wiring Board - Deck A Section

Schematic Diagram - Deck A Section

Printed Wiring Board - Deck B Section

Schematic Diagram - Deck B Section

Schematic Diagram - Power Section

Printed Wiring Board - Power Section

IC Pin Function

Detailed pin functions for the main system control IC (IC801).

Section 8 Electrical Parts List

Semiconductor Parts List

Resistor Parts List

Capacitor Parts List

IC Parts List