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TABLE OF CONTENTS CHAPTER I FEATURES AND SPECIFICATIONS 1. SYSTEM REQUIREMENT ... I-1 2. FEATURES ... I-1 3. CONFIGURATION ... I-3 3.1 Mechanics ... I-3 3.2 Electronics ... I-4 4. SPECIFICATIONS ... I-5 4.1 Printing ... I-5 4.2 Functions ... I-5 4.3 Electrical and Mechanical ... I-6 4.4 Environment ... I-6 4.5 Dimensions and Weight ... I-6 4.6 Recommended Paper ... I-6 4.7 Paper Specifications ... I-7 4.8 Printable Area ... I-8 4.9 Control Panel (LED and Buttons) ... I-10 4.10 How To Clean the Print Head - Purge ... I-14 4.11 Replacing The Ink Cartridges ... I-15 4.12 Recovery Function - Purge ... I-16 5. SAFETY INFORMATION ... I-19 5.1 Ink Safety ... I-19 6. CONSUMABLES AND SERVICE ACCESSORIES ... I-19 6.1 Brother Special Paper ... I-19 6.2 Ink Cartridges ... I-19 6.3 ACSF and Parallel I/F Cable ... I-20 CHAPTER II THEORY OF OPERATION 1. GENERAL ... II-1 1.1 Normal Interlace Processing (360dpi) ... II-1 1.2 Super Fine Interlace Processing (720dpi) ... II-2 2. ELECTRONICS ... II-3 2.1 General Block Diagram (MP-21C/MP-21CDX) ... II-3 2.2 Electric Cofiguration ... II-4 2.3 Main PCB ... II-5 2.4 Head PCB ... II-9 2.5 Carriage PCB ... II-9 2.6 Carriage Sensor PCB ... II-9 2.7 Power Supply ... II-10 3. MECHANICS ... II-11 3.1 Overview of Printing Mechanism ... II-11 3.2 Print Head ... II-12 3.3 Ink Cartridge ... II-14 3.4 Head Maintenance Mechanism ... II-15 3.5 Sensors ... II-16 3.6 Carriage Drive Mechanism ... II-20 3.7 Paper Feed Mechanism ... II-21 CHAPTER III DISASSEMBLY AND REASSEMBLY 1. PRECAUTIONS ... III-1 1.1 Safe Precautions ... III-1 1.2 Attention ... III-1 2. TIGHTENING TORQUE LIST ... III-2 3. DISASSEMBLY ORDER FLOW ... III-3 4. DISASSEMBLING AND REASSEMBLING PROCEDURE ... III-4 4.1 Ink Cartridge, ACSF ... III-4 4.2 Top Cover, Paper Guide, Front Cover, Release Plate, Rear Cover ... III-5 4.3 Head PCB ASSY ... III-8 4.4 Ink Head Base Unit, Print Head ... III-9 4.5 Bottom Cover ... III-12 4.6 Main PCB, Power Supply PCB ASSY ... III-14 4.7 Paper Feed Motor ASSY ... III-16 4.8 Purge Unit ASSY ... III-18 4.9 Paper Feed Frame ASSY ... III-22 4.10 ACSF ... III-34 5. LUBRICATION ... III-38 6. CLEANING THE Printer ... III-43 6.1 Cleaning The Platen Cover ... III-43 6.2 Cleaning The Edge Of The Head Cap ... III-43 6.3 Cleaning The Pick-up Roller On The ACSF ... III-44 7. PACKING ... III-45 CHAPTER IV TROUBLESHOOTING 1. INTRODUCTION ... IV-1 1.1 Initial Check ... IV-1 1.2 Basic Procedure ... IV-2 2. TROUBLESHOOTING ... IV-3 2.1 Troubleshooting Procedure ... IV-3 3. INSPECTION MODE ... IV-10 3.1 Extended Functions ... IV-10 3.2 Hidden Functions ... IV-11 3.3 Error Codes ... IV-13 APPENDIX A Appendix A1 Head PCB Circuit Diagram ... A-1 Appendix A2 Main PCB Circuit Diagram (1/3) ... A-2 Appendix A3 Main PCB Circuit Diagram (2/3) ... A-3 Appendix A4 Main PCB Circuit Diagram (3/3) ... A-4 Appendix A5 Cartridge Sensor Circuit Diagram ... A-5 APPENDIX B Appendix B Head Cleaning ... B-1