Brother P-touch mini tech Service Manual(1).pdf

SERVICE MANUAL

MODEL: PT-MT (P-touch mini' tech)

PREFACE

This publication is a service manual covering the specifications, outline of operating

principles, disassembly/reassembly procedure, and troubleshooting of the Brother PT-

MT. It is intended for service personnel and other concerned persons to accurately and

quickly provide after-sale service for our PT-MT.

To perform appropriate maintenance so that the machine is always in best condition

for the customer, the service personnel must adequately understand and apply this

manual.

This manual is made up of four chapters and appendix.

CHAPTER I

SPECIFICATIONS

CHAPTER II THEORY OF OPERATION

CHAPTER III DISASSEMBLY/REASSEMBLY

CHAPTER IV TROUBLESHOOTING

APPENDIX

MAIN PCB CIRCUIT DIAGRAM

No part of this publication may be reproduced in any

form or by any means without permission in writing

from the publisher.

Specifications are subject to change without notice.

CONTENTS

CHAPTER I SPECIFICATIONS

1.1 Mechanical Specifications................................................................................................ I - 1

1.1.1 External Appearance ................................................................................................. I - 1

1.1.2 Entry system .............................................................................................................. I - 1

1.1.3 Display....................................................................................................................... I - 1

1.1.4 Printing Mechanism ................................................................................................... I - 2

1.1.5 Tape Cassette ........................................................................................................... I - 2

1.1.6 Tape Cutter................................................................................................................ I - 2

1.2 Electronics Specifications ................................................................................................ I - 4

1.2.1 Character Generator .................................................................................................. I - 4

1.2.2 Power Supply............................................................................................................. I - 4

CHAPTER II THEORY OF OPERATION

2.1 Outline of Mechanisms .................................................................................................. II - 1

2.1.1 Print Mechanism ...................................................................................................... II - 1

2.1.2 Platen Setting & Retracting Mechanism................................................................... II - 2

2.1.3 Tape Feed Mechanism ............................................................................................ II - 3

2.1.4 Tape Cutter Mechanism........................................................................................... II - 4

2.1.5 Cutter Safety Lock Mechanism ................................................................................ II - 5

2.2 Outline of Control Electronics ........................................................................................ II - 6

2.2.1 Configuration ........................................................................................................... II - 6

2.2.2 Main PCB................................................................................................................. II - 7

CHAPTER III DISASSEMBLY & REASSEMBLY

3.1 Disassembly Procedure ................................................................................................ III - 2

[ 1 ] Removing the Cassette Cover, Dry Cells, Tape Cassette, and Cutter Unit .............. III - 2

[ 2 ] Removing the Chassis ASSY ................................................................................... III - 3

[ 3 ] Removing the Main PCB .......................................................................................... III - 6

[ 4 ] Removing Battery Terminals P1 and P2................................................................... III - 8

[ 5 ] Removing the Rubber 4 Key, Lens, Dial Sheet, Select Dial, Select Dial Claw,

and Enter Key .......................................................................................................... III - 9

3.2 Reassembly Procedure............................................................................................... III - 10

[ 1 ] Installing the Enter Key, Select Dial Claw, Select Dial, Dial Sheet, Lens, and

Rubber 4 Key ......................................................................................................... III - 10

[ 2 ] Installing Battery Terminals P2 and P1................................................................... III - 12

[ 3 ] Installing the Main PCB .......................................................................................... III - 13

[ 4 ] Installing the Chassis ASSY ................................................................................... III - 14

[ 5 ] Setting the Cutter Unit, Tape Cassette, Dry Cells, and Cassette Cover ................. III - 17

[ 6 ] Final Operation Check............................................................................................ III - 18

[ 7 ] Inspection Mode..................................................................................................... III - 19

CHAPTER IV TROUBLESHOOTING

4.1 Troubleshooting ............................................................................................................ IV - 1

4.1.1 Precautions............................................................................................................. IV - 1

4.1.2 After Repairing........................................................................................................ IV - 1

4.1.3 Troubleshooting Flows............................................................................................ IV - 2

[ 1 ] Tape feeding failure ................................................................................................ IV - 2

[ 2 ] Printing failure......................................................................................................... IV - 3

[ 3 ] Powering failure (Nothing appears on the LCD.)..................................................... IV - 4

[ 4 ] Abnormal LCD indication ........................................................................................ IV - 5

[ 5 ] No key entry possible.............................................................................................. IV - 5

APPENDIX MAIN PCB CIRCUIT DIAGRAM

CHAPTER I SPECIFICATIONS

1.1 Mechanical Specifications

1.1.1 External Appearance

Figure 1.1-1 External Appearance

(1) Dimensions (W x D x H) 105 mm x 154 mm x 52 mm

(2) Weight

Machine proper

Approx. 250 g

In package

Approx. 500 g (incl. a tape cassette, excl. dry cells)

1.1.2 Entry system

(1) Rubber keypad

4 keys

(2) Dial

32 positions

1.1.3 Display

(1) Display type

Liquid crystal display (LCD)

(2) Number of columns

8 columns x 1 row

(See Figure 1.1-2.)

(3) Number of indicators

7 (See Figure 1.1-2.)

I - 1

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