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PREFACE
This publication is a service manual covering the specifications, theory of operation, disassembly/reassembly procedure, and troubleshooting of the Brother P-touch 55. It is intended for service personnel and other concerned persons to accurately and quickly provide after-sale service for our P-touch 55. 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 CHAPTER II CHAPTER III CHAPTER IV APPENDIX
SPECIFICATIONS THEORY OF OPERATION DISASSEMBLY & REASSEMBLY TROUBLESHOOTING MAIN PCB CIRCUIT DIAGRAM
© Copyright Brother 2003 All rights reserved. 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 Keyboard................................................................................................................... I - 1 1.1.3 Display ...................................................................................................................... I - 2 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 1.3 Key Commands for Special Functions............................................................................. I - 5 1.3.1 Demonstration Print................................................................................................... I - 5 1.3.2 Inspection Mode ........................................................................................................ I - 5
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 [ 1 ] Block Diagram......................................................................................................... II - 7 [ 2 ] Solder Points ........................................................................................................... II - 8 2.2.3 Key PCB................................................................................................................... II - 9
CHAPTER III DISASSEMBLY & REASSEMBLY
n Safety Precautions............................................................................................................ III - 1 n Tightening Torque List ...................................................................................................... III - 1 3.1 Disassembly/Reassembly ............................................................................................. III - 2 [ 1 ] Removing the Cassette Cover, Tape Cassette, and Dry Cells................................ III - 2 [ 2 ] Separating the Bottom Cover from the Body Cover................................................ III - 3 [ 3 ] Removing the Main PCB ASSY and Rubber Key ................................................... III - 5 [ 4 ] Removing the DC Motor ASSY and Double Gears ................................................. III - 6 [ 5 ] Removing the Roller Holder ASSY and its Release Spring..................................... III - 7 [ 6 ] Removing the Cutter Lever and its Release Spring ................................................ III - 8 [ 7 ] Removing the Head ASSY ..................................................................................... III - 9 3.2 Final Check and Inspection Mode ............................................................................... III - 10
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 - 4 [ 3 ] Powering failure (Nothing appears on the LCD.) ....................................................IV - 6 [ 4 ] No key entry possible .............................................................................................IV - 7 [ 5 ] Abnormal LCD indication........................................................................................IV - 8
APPENDIX. MAIN PCB CIRCUIT DIAGRAM
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APPENDIX. MAIN PCB CIRCUIT DIAGRAM
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NAME CODE
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MAIN PCB CIRCUIT DIAGRAM PT55 LN0017000
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