Teac W-470 User Manual

TEAC.
SERVICE MANUAL
w-470
Stereo Double Cassette Deck
CAUTION
A Parts maked with this sign are safety critical components.
* Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol OO are trademarks
of Dolby Laboratories Licensing Corporation.
They must always be replaced with identical components—
refer to the appropriate parts list and ensure exact replacement.
Effective: JULY, 1989 9103003100

Teac W-470 Specifications

General

Track System	4-track, 2-channel stereo
Motor	DC servo motor
Frequency Response (Normal Tape)	30 Hz - 14 kHz
Wow and Flutter	0.08% WRMS
Output	0.5 V (line out)
Outputs (Line Out)	500mV (line)
Power Supply	AC 120V, 60Hz

Summary

1. Specifications and Service Data

Specifications Overview

Detailed technical parameters including tape speed, input/output levels, equalization, and head configuration.

Service Data and Specifications

Mechanical and electrical performance data, including speed deviation, wow/flutter, and frequency response.

2 Case and Front Panel Removal

3 Parts Location Guide

4 Mechanical Adjustment and Checks

4-1 Wow and Flutter Measurement

Procedure for measuring and verifying tape playback wow and flutter performance.

4-2 Tape Speed Adjustment

Steps for adjusting and checking tape speed accuracy for both normal and high-speed modes.

4-3 Reel Torque Measurement

Method for measuring and adjusting tape reel torque for proper tape handling.

4-4 Lubrication Procedures

Guidelines for lubricating mechanical parts, specifying appropriate oils.

4-5 Voltage Conversion

Instructions for converting the unit's voltage setting for different regions.

5 Electrical Adjustment and Checks

5-2 Playback Performance Checks

Procedures for checking playback performance, including azimuth, output level, frequency response, and S/N ratio.

5-3 Monitor Performance Checks

Tests for monitoring input levels, headphone output, and recording/playback performance.

5-4 Recording Performance Adjustments

Adjustments and checks for recording bias, level, frequency response, and signal-to-noise ratio.

5-5 Frequency Response Tests

Detailed checks of frequency response for playback, overall, and dubbing modes.

Parts List Section

6 Exploded Views and Parts List

Exploded View-1

Visual breakdown of the unit's components with reference numbers for parts identification.

Exploded View-2

Second exploded view illustrating component placement and identification.

Exploded View-3

Third exploded view detailing various components and their assembly.

7 PC Boards and Parts List

Jack PCB Assembly

Diagram and parts list for the Jack PCB assembly.

Dolby SW PCB Assembly

Diagram and parts list for the Dolby Switch PCB assembly.

Timer SW PCB Assembly

Diagram and parts list for the Timer Switch PCB assembly.

Meter PCB Assembly

Diagram and parts list for the Meter PCB assembly.

Main PCB Assembly

Detailed diagram and parts list for the Main PCB.

Key PCB Assembly

Diagram and parts list for the Key PCB assembly.

Power PCB Assembly

Diagram and parts list for the Power PCB assembly.

Integrated Circuit Block Diagrams

CX-20187 IC Diagram

Block diagram and pinout for the CX-20187 integrated circuit.

NJM4558S IC Diagram

Block diagram and pinout for the NJM4558S operational amplifier.

μ PC4570C IC Diagram

Block diagram and pinout for the μ PC4570C integrated circuit.

TC-4066BP IC Diagram

Block diagram and pinout for the TC-4066BP analog switch IC.

NJM7908FA IC Diagram

Block diagram and pinout for the NJM7908FA voltage regulator.

NJM7808FA IC Diagram

Block diagram and pinout for the NJM7808FA voltage regulator.