Teac A 103 Service Manual

Page 1

A-l07/A-I06
A-lOS/A-IO3

Stereo Cassette Deck with Dolby System

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GENERAL INTRODUCTION

This Service Manual is written for the TEAC A-lO3, A-lOS, NOTE: When ordering replacement parts, please refer to
A-lO6 and A-107., All of these models are very similar and the PARTS LIST which is printed separately from
the mechanical and electrical adjustment procedures are this manual.
the same unless specifically noted.
The chart below shows the differences in the various Model Difference Table
models. As can be seen, these differences are primarily in
outer appearance of the models and feature changes. Model Head 833(31- ngng Mectziostcale
If any of the adjustments or repairs seem too complicated
or are difficult to accomplish, please contact the nearest A403 mm Nmmduded NM mcmdw Glee
TEAC factory service department or write directly to a A405 Ferrite Nmmduded Nmmduded yeuow
TEAC office, the address of which is printed on the back A406 Fem mud dud Gm"
cover of this manual. A-107 Ferrite Included included Yellow

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* Noise reduction circuit made under license from Dolby
Laboratories Inc. The word Dolby and the Double-D
symbol are trademarks of Dolby Laboratories Inc.

TEAC CORPORATION

51032120

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4-1.
4-2.
4-3.
4-4.
4-5 .
4-6.
4-7.

4-9.
4-10.
4-11.

4-12.

5-1.
5-2.
5-3.
5-4.

5-4-1.
5-4-2.

TABLE OF CONTENTS

Test Equipment Required ............. 3
Specifications & Service Data ........... 4
TEAC Test Tape .................... 4
Parts Location ..................... 6
Partial Disassembly of Main Parts ......... 7
External Parts ..................... 7
Cassette Damper (Damper Cord Stringing) . . . 8
Cassette Holder Assy ................ 8
Reel Tables ....................... 8
Brake Plate Assy ................... 9
Head ........................... 9
Pinch Roller ...................... 9
Motor ........................... 10
Capstan Drive Assy ................. 10
Lubrication ....................... 1 1
Idler ............................ 1 1
Tension Pulley Assy ................. 1 1
Mechanical Checks and Adjustments ...... 12
Take-up Torque .................... 12
Fast Forward & Rewind Torque ......... 12
Pinch Roller Pressure ................. 12
Tape Speed/Wow and Flutter ........... 13
Tape Speed ....................... 13
Wow and Flutter ................... 13

6.
6-1.
6-11.
6-1-2.
6-1 -3.
6-1-4.
6-1-5.
6-1-6.
62.
6-2-1.
6-2-2.
6-2-3.
6-3.
6-3-1.
6-3-2.
6-3-3
6-3-4.
6-3~5.
6-3-6.
6-3-7.
6-3-8.
6-3-9.
6-3-10.
64.

Electrical Checks and Adjustments ........ 14
Playback Performance ................ l4
Record/Playback Head Azimuth Adjustments . 14
Specified Output Level Setting .......... 15
VU Meter Calibration ................ 15
Frequency Response _ Playback - ....... 15
Signal to Noise Ratio - Playback - ....... 16
Headphone Output Level Checks ......... 16
Monitor Performance ................ 16
Minimum Input Level Checks ........... 16
Specified RECORD Control Setting ....... 17
VU Meter Calibration Checks ........... 17
Recording Performance ............... 17
Bias Trap Adjustments ................ 17
Record Bias Setting .................. 18
Record Level Setting ................. 18
Distortion Checks ................... 19
Frequency Response Checks - Overall - . . . 19
Signal to Noise Ratio - Overall - ........ 20
Erase Efficiency .................... 20
Channel Separation .................. 21
Adjacent Track Crosstalk Measurement ..... 22
Dolby NR Effect MeasUrement .......... 22
Adjustment Location ................ 23
Level Diagram ..................... 24
Block Diagram ..................... 26
Voltage and Frequency Setting .......... 27

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(Continued on page- 9 l

REF. NO. PARTS N0. DESCRIPTION REMARKS

4 -42 51280340 Cord, AC Power GENERAL EXPORT
'51280170 Cord, AC Power EUROPE
*51280360 Cord, AC Power UK
'51 280310 Cord, AC Power AUSTRALIA

4 - 43 55800040 Washer, Aluminum

4 -44 51675410 PC Board,A Part of4-30

4 - 45 51675420 PC Board, 8 Part of 4 - 30

4 - 46 *55446370 Shaft, Var. Res. A-107, A-106

4 - 47 55344520 Adapter, Shaft A407' A406

4 - 48 51340740 Switch, Push A-107, A-106

4 - 49 55551481 Bracket, Push Switch A-107, A-106

4 - 50 55342960 Button, Push Switch A-107, A-106

4 - 51 55340M1 Clamper, Power Cord EUROPE, U.K.

4 - 52 55550640 Bracket, Clamper EUROPE, UK

4 - 53 *55550600 Bracket, B GNERAL EXPORT, EUROPE, U.K

4 - 54 55550620 Plate, Selector; A GENERAL EXPORT

4 - 55 '51675480 PC Board, Voltage Selector GENERAL EXPORT

4 - 56 51685460 PC Board Assv, Fuse EUROPE, U.K.
51675460 PC Board, Fuse EUROPE, U.K.
51420870 Holder, Fuse EUROPE, U.K.
51420880 Fuse, 250 mA T EUROPE, U.K.
50411380 Fuse, 500 mAT EUROPE, U.K.
a51421860 Fuse, 800 mAT EUROPE, U.K.

4 - 57 55800030 Washer, Fiber A-107, A-105

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