Teac A-300 - User Manual

Stereo
Cassette
Deck
with
Dolby
System
NOTE
If
any
of
the
adjustments
or
repairs
seem
too
compli-
cated
or
are
difficult
to
accomplish,
please
contact
the
nearest
TEAC
Factory
Service
Department
or
write
directly
to
a
TEAC
office,
the
addresses
of
which
are
printed
on
the
back
cover
of
this
manual.
When
ordering
replacement
parts,
please
refer
to
the
PARTS
LIST
which
is
printed
separately
from
this
manual
and
included
as
an
insert.
TEAC
CORPORATION
51032580

Summary

Test Equipment Requirements

Torque Meters and Scales

Cassette torque meter and spring scale for pressure checks.

Measurement Instruments

Wow/flutter meter, frequency counter, AF oscillator, AC voltmeter.

Other Test Tools

Attenuator, distortion analyzer, oscilloscope, filters, resistors, tools.

Specifications and Service Data

General Unit Specifications

Details tape type, speed, inputs, outputs, equalization, heads, motor, power.

TEAC Test Tape Specifications

Details of TEAC test tapes for calibration and performance checks.

Mechanical and Electrical Data

Mechanical Performance Data

Tape speed, drift, wow/flutter, torque, pressure specifications.

Electrical Performance Data

Frequency response, S/N, erase efficiency, separation, distortion specs.

Parts Location Guide

Internal Component Layout

Top view diagram identifying major internal components.

Front Panel Component Layout

Front view diagram identifying panel components.

Illustrated Disassembly Procedures

General Disassembly and Reassembly Notes

Guidelines for safe and correct disassembly and reassembly practices.

External Parts and Cassette Damper Disassembly

Diagrams for disassembling external parts and the cassette damper.

Disassembly Procedures (Continued)

Cassette Holder, Heads, Pinch Roller, Reel Tables Disassembly

Diagrams for disassembling cassette holder, heads, pinch roller, and reel tables.

Disassembly Procedures (Continued)

Motor, Capstan Drive, and Brake Plate Disassembly

Diagrams for disassembling motor, capstan drive, and brake plate assemblies.

Mechanical Checks and Adjustments

Torque and Pinch Roller Pressure Adjustments

Procedures for checking and adjusting torque and pinch roller pressure.

Mechanical Checks and Adjustments (Continued)

Tape Speed, Wow, and Flutter Adjustments

Procedures for adjusting and measuring tape speed, wow, and flutter.

Electrical Checks and Adjustments

Playback Performance and Head Azimuth

Procedures for checking playback performance and adjusting head azimuth.

Electrical Checks and Adjustments (Continued)

Output Level, VU Meter, and Playback Frequency Response

Procedures for setting output levels, calibrating VU meters, and checking playback frequency response.

Electrical Checks and Adjustments (Continued)

Signal-to-Noise Ratio, Headphone Output, and Monitor Performance

Procedures for checking SNR, headphone output, and monitor performance.

Electrical Checks and Adjustments (Continued)

Input Level Checks and Recording Performance Notes

Procedures for input level checks and general notes for recording performance.

Recording Performance Adjustments

Bias Trap, Record Bias, and Record Level

Procedures for adjusting bias trap, record bias, and record level.

Recording Performance Adjustments (Continued)

Distortion and Frequency Response Checks

Procedures for checking distortion and overall frequency response.

Recording Performance Adjustments (Continued)

Signal-to-Noise Ratio and Erase Efficiency

Procedures for checking overall SNR and erase efficiency.

Recording Performance Adjustments (Continued)

Channel Separation Check

Procedure for checking channel separation.

Recording Performance Adjustments (Continued)

Crosstalk and Dolby NR Effect Measurement

Procedures for measuring crosstalk and Dolby NR effect.

Adjustment and Test Point Locations

Adjustment Point Diagrams

Diagrams showing the locations of adjustment points.

Test Point Diagrams

Diagrams showing the locations of test points.

Block Diagram

Circuit Block Diagram

Schematic diagram of the device's electronic circuits.

Level Diagram

Playback and Recording System Levels

Level diagrams for playback and recording signal paths.

Voltage and Frequency Setting

Voltage Selector and Frequency Adaptation

Procedures for setting voltage selector and information on frequency adaptation.

Parts List

Exploded Views and Parts List Overview

Introduction to exploded views and parts list structure.

Parts Ordering Information and Notices

Details on ordering parts and important notices.

Parts List (Continued)

Exploded View-1

Diagram showing exploded view of major external assemblies.

Parts List (Continued)

Included Accessories

List of included accessories with part numbers.

Parts List (Continued)

Exploded View-2

Diagram showing exploded view of internal mechanical parts.

Parts List (Continued)

Exploded View-2 Parts List

Detailed list of parts for Exploded View-2.

Parts List (Continued)

Exploded View-3

Diagram showing exploded view of internal mechanical parts.

Parts List (Continued)

Exploded View-3 Parts List

Detailed list of parts for Exploded View-3.

Parts List (Continued)

Exploded View-4

Diagram showing exploded view of front panel and internal components.

Parts List (Continued)

Exploded View-4 Parts List

Detailed list of parts for Exploded View-4.

PC Board Section Diagrams

REC;PLAY AMPL. PCB Diagram

Circuit diagram for the Record/Playback Amplifier PCB.

PC Board Section Diagrams (Continued)

MECHANISM PCB Diagram

Circuit diagram for the Mechanism PCB.

IN;OUTPUT PCB Diagram

Circuit diagram for the Input/Output PCB.

PC Board Section Parts Lists

REC;PLAY AMPL. PCB Parts List

Parts list for the Record/Playback Amplifier PCB.

PC Board Section Parts Lists (Continued)

Capacitors, Variable Resistors, Trimmers

Component lists for capacitors, variable resistors, and trimmers.

Coils, Transformers, and Miscellaneous

Component lists for coils, transformers, and miscellaneous items.

PC Board Section Parts Lists (Continued)

MECHANISM PCB Parts List

Parts list for the Mechanism PCB.

IN;OUTPUT PCB Parts List

Parts list for the Input/Output PCB.

PC Board Section Parts Lists (Continued)

I;O PCB Diodes and Resistors

Lists of diodes and resistors for the Input/Output PCB.

I;O PCB Capacitors

Lists of capacitors for the Input/Output PCB.

Assembling Hardware Coding List

Screw and Washer Codes

Codes and types for various screws and washers used in assembly.

Teac A-300 Specifications

General

Brand	Teac
Model	A-300
Category	Cassette Player
Language	English