Brother PT-1850, 1900, 1910 Service Manual.pdf

SERVICE MANUAL

MODEL: PT-1900/1910/1850

PREFACE

This publication is a service manual covering the specifications, general mechanisms,

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

1900/1910/1850. It is intended for service personnel and other concerned persons to accurately

and quickly provide after-sale service for our PT-1900/1910/1850.

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 appendices.

CHAPTER I

SPECIFICATIONS

CHAPTER II

GENERAL MECHANISMS

CHAPTER III

DISASSEMBLY & REASSEMBLY PROCEDURE

CHAPTER IV

TROUBLESHOOTING AND ERROR MESSAGE

APPENDIX 1.

CIRCUIT DIAGRAMS

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......................................................................... I-1

1.1 MECHANICAL SPECIFICATIONS ........................................................................ I-1

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

1.1.2 Keyboard........................................................................................................ I-2

1.1.3 Display ........................................................................................................... I-2

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

1.1.5 Tape Cassette ................................................................................................ I-3

1.1.6 Tape Cutter .................................................................................................... I-3

1.2 ELECTRONICS SPECIFICATIONS ...................................................................... I-10

1.2.1 Character Generator....................................................................................... I-10

1.2.2 Power Supply ................................................................................................. I-10

1.3 KEY COMMANDS FOR SPECIAL FUNCTIONS ................................................... I-10

1.3.1 Initializing ....................................................................................................... I-10

1.3.2 Demonstration Print........................................................................................ I-10

CHAPTER II GENERAL MECHANISMS............................................................ II-1

2.1 MAIN MECHANISM .............................................................................................. II-1

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

2.1.2 Roller Holder ASSY Setting & Retracting Mechanism..................................... II-3

2.1.3 Tape & Ribbon Feed Mechanism.................................................................... II-4

2.1.4 Automatic Tape Cutter Mechanism (PT-1900/1910) ....................................... II-6

2.1.5 Tape Cutter Mechanism (PT-1850)................................................................. II-7

2.1.6 Roller Holder ASSY & Cassette Cover Interlocking Mechanism...................... II-8

2.2 OUTLINE OF CONTROL ELECTRONICS ............................................................ II-10

2.2.1 Configuration of the Electronic Part ................................................................ II-10

2.2.2 Main PCB....................................................................................................... II-10

2.2.3 Power Supply PCB ......................................................................................... II-10

2.2.4 Cassette Sensor ............................................................................................. II-10

2.2.5 DC Motors ...................................................................................................... II-10

2.2.6 Thermal Print Head ........................................................................................ II-10

2.3 MAIN PCB............................................................................................................. II-11

2.3.1 Block Diagram................................................................................................ II-11

2.3.2 Solder Points.................................................................................................. II-12

2.4 POWER SUPPLY PCB ......................................................................................... II-13

CHAPTER III DISASSEMBLY & REASSEMBLY .............................................. III-1

3.1 DISASSEMBLY PROCEDURE.............................................................................. III-1

[ 1 ] Removing the Battery Lid and Batteries....................................................... III-1

[ 2 ] Removing the Tape Cassette and Tape Separator Stick.............................. III-2

[ 3 ] Removing the Bottom Cover ....................................................................... III-4

[ 4 ] Removing the Cassette Cover, Main Frame ASSY...................................... III-7

[ 5 ] Removing the Main PCB Unit and Rubber Key Pad..................................... III-16

[ 6 ] Removing the Switch ASSY ........................................................................ III-18

[ 7 ] Removing the Blind Cover........................................................................... III-18

[ 8 ] Removing the Power Supply PCB ............................................................... III-19

[ 9 ] Removing the Battery Terminals ................................................................. III-20

3.2 REASSEMBLY PROCEDURE............................................................................... III-21

[ 1 ] Installing the Battery Terminals ................................................................... III-21

[ 2 ] Installing the Power Supply PCB ................................................................. III-22

[ 3 ] Installing the Blind Cover............................................................................. III-24

[ 4 ] Installing the Switch ASSY .......................................................................... III-25

[ 5 ] Installing the Rubber Key Pad ..................................................................... III-26

[ 6 ] Installing the Main PCB Unit ........................................................................ III-27

[ 7 ] Installing the Main Frame ASSY .................................................................. III-29

[ 8 ] Installing the Bottom Cover ......................................................................... III-37

[ 9 ] Installing the Cassette Cover ....................................................................... III-39

[ 10 ] Installing the Tape Cassette and Tape Separator Stick ................................ III-40

[ 11 ] Loading Batteries and Installing the Battery Lid ........................................... III-41

[ 12 ] Demonstration Print and Final Check .......................................................... III-42

CHAPTER IV TROUBLESHOOTING AND ERROR MESSAGE ....................... IV-1

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-4

[ 3 ] Powering failure (Nothing appears on the LCD.) .......................................... IV-6

[ 4 ] No key entry possible .................................................................................. IV-8

[ 5 ] Tape cutting failure...................................................................................... IV-9

[ 6 ] Abnormal LCD indication ............................................................................. IV-10

[ 7 ] Tape cassette type not identified ................................................................. IV-11

4.2 ERROR MESSAGE............................................................................................... IV-12

4.2.1 Error Message List ......................................................................................... IV-12

Appendix 1. CIRCUIT DIAGRAMS

Appendix 1.A Main PCB CIR 1900 (PT-1900/1910)

Appendix 1.B Main PCB CIR 1850 (PT-1850)

Appendix 1.C Sub PCB

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