Epson LX-1050+ ,ap~en,ion

Operating Principles

LX-105O+

Service Manual

2.2.3 Paper Feed Mechanism Operation

Friction feeding is used for cut sheets, and push tractor feeding is used for fanfold paper.

Friction-Feed Operation

The paper is held against the platen by paper-feed rollers. The paper-feed motor rotates the platen

gear, via the paper-feed reduction gear, in the direction

shown

following

figure. Because of the

friction between the paper-feed rollers and the platen, the rotation of

the

platen gear causes the

paper to be fed. The feeding direction is indicated by the arrow in the Figure.

The paper is held against the platen by the spring force of the paper-feed rollers, and can be

released by shifting the paper-release lever forward.

Platen paper (Cut Sheet)

,ap~en,ion

,O,,er

ion Gear

Motor

Paper d Motor

Figure 2-5. Friction Feed Operation

2-4

Rev.

Contents

Main SEIKO EPSON CORPORATION PRECAUTIONS DANGER WARNING PREFACE Page TABLE OF CONTENTS Chapter 1 General Description List 1.1 of Figures List of Tables 1.1 FEATURES aperguideSp.per-re,e.e Figure 1-1. Exterior View of the LX-105O+ Table 1-1. Options for LX-105O+ 1.2 SPECIFICATIONS b 40 &--=- Pin Configuration Table 1-2. Print Speed and Printable Columns Table 1-3. Character Tables x x x x o 1-4 1.2.2 I I Paper Handling Specification 1.2.3 Paper Specification c1 1.2.4 Ink Ribbon I 1.2.5 Environmental Conditions M(2, 1.2.6 Electrical Specifications Table 1-5. Electrical Specifications 1.2.7 Reliability 1.3 INTERFACE OVERVIEW Parallel InterFace 1.3.1 Table 1-6. Connector Pin Assignments 1/0 and - though II II OFf= DENSED CON- SelecType 1.4.2 Functions 1.4.3 Micro Adjustment 1.4.4 Panel Operation at Power ON II Table 1-7. Settings for DIP Switch III Table 1-8. International Character Set Selection (DIP SW 1-5: OFF) Table 1-9. Character Table Selection (DIP SW 1-5: ON) Sw ~:pj:;d I I 1-10. Page Length Selection w 1.4.6 Buzzer Operation The EEPROM 1.4.7 Reset 1.5 MAIN COMPONENTS 1.5.1 TAMA Main Control Board Figure 1-8. TAMA Board Component Layout Figure 1-9. TAa Filter Unit 220/240V Version 1.5.3 Printer Mechanism (M-3D60) Figure 1-10. Printer Mechanism (M-3D60) Chapter 2 Operating Principles Figures of Tables 2.1 OVERVIEW Q Figure 2-1. Block Diagram of the Printer Mechanism v printhead printer mechanism is composed of the Ilxl cl--k-e 4P++1 / Figure 2-2. Printhead Printing Operation -% Figure 2-4. Home Position Sensor Mechanism Figure 2-3. Home ,ap~en,ion Figure 2-5. Friction Feed Operation Figure 2-6. Tractor Feed Operation Page 2.2.4 Ribbon Advance Mechanism Figure 2-9. Ribbon Feed Mechanism Table 2-1. Ribbon-Feed Gear Train 2.3 OPERATING PRINCIPLES OF THE ELECTRICAL I Figure 2-10. Power Supply Circuit Block Diagram CIRCUITRIES 2.3.1 Operating Principles of the Power Supply Circuit Table 2-2. Voltage Applications Voltage Purpose EIE m Figure 2-11. Main Control Circuit Block Diagram L?apnthead Figure 2-12. Data Flow +2J?!-P k + Sensor Circuit o M rffPD78 10HG Figure 2-16. Paper Feed Motor Drive Circuit EO:\O (3 B) Printhead --N EO%30 (3 B) --l/ --N Print herd L :11111%11 k H-M & ti+ Figure 2-19. K Circuit EEPROM ER59256 Chapter 3 Disassembly and Assembly Table of Contents List of Figures List of Tables 3.1 GENERAL REPAIR INFORMATION I Table 3-1. Repair Tools Description Part No. Round-nose pliers B7404OO1OO Nipper 6740500100 3.2 DISASSEMBLY AND ASSEMBLY 3.2.1 Printhead Removal Figure 3-2. Printhead Removal 3.2.2 Removal of Casing c A u v Page Page 3.2.3 Removal of Circuit Boards TAMA 3.2.3.1 Board Removal \ Board TAMA Figure 3-8. Removal II+M! Figure 3-9. d C.B.(O) TA-a Figure 3-11. Carriage Motor Mounting Plate Removal Figure 3-12. Carraige Motor Removal DDnlB&YuUltiNua :4K8ZSM:WIIBI Figure 3-13. Home-Position Sensor Removal 3.2.5.3 Removal of Platen mn~umlum Figure 3-14. Cresent Ring Removal Figure 3-15. Platen Cover Removal :wK@lDma31Dl 3.2.5.4 Separate of Frame FFC Figure 3-16. Head Cable Holder and Removal Figure 3-17. Helical Spring Hook o Figure 3-19. Release Lever Replacement Separate the tractor cancellation cum from paper feed lever cancellation shaft. ~1 no -2iiB Separation of Tractor Diseugage Cam n El -E Figure 3-22. Separate of Frame 3.2.5.5 Removal of Paper Feed Motor Figure 3-23. Paper Feed Motor Removal 3.2.5.6 3.2.5.7 r Figure 3-24. Paper Removal of Paper Guide Plate End Sensor Removal Figure 3-25. Paper Guide Plate Removal Figure 3-26. Adjust Lever Removal /7zkTrac0Frame(L 4- T7 5- Figure 3-28. Extraction of Tractor Set Figure 3-29. Tractor Phase Alignment Chapter 4 Adjustments Figures 4.1 ADJUSTMENTS 4.1.1 Carriage Motor Backlash Adjustment Motor Backlash Adjustment o / \ \ 4.1.2 Paper Feed Motor Backlash Adjustment ~y) /- o 0 / \ . 4.1.3 Platen Gap Adjustment Figure 4-3. Removal of Ribbon Mask Figure 4-4. Head Adjust Lever B \/ r--- Figure 4-6. Eccentric of Guide /;!1 Figure 4-5. Platen Gap Adjustment 4.2 61-DIRECTIONAL PRINTING ALIGNMENT ADJUSTMENT 10, Chapter 5 Troubleshooting 5.2 SELF-DIAGNOSTIC FUNCTION TROUBLESHOOTING 5-2 List of Tables 5.1 OVERVIEW Table 5-1. Motor Resistance Printhead Figure 5-1. o 5.2 SELF-DIAGNOSTIC FUNCTION Table 5-3. Error Codes 5.3 TROUBLESHOOTING I CPU. 5.3.1 Troubleshooting of Abnormal Operation Table 5-4. Symptoms and Problems Table 5-6. The LEDs do Not Operate at All Table 5-7. The Buttons do Not Operate at All Cause Step Table 5-8. Carriage Error Displayed Table 5-9. Paper is Not Fed (1) Table 5-10. Paper is Not Fed (2) Table 5-11. Paper Out Displayed Step Table 5-13. Incorrect SRAM Displayed The TAMA board may Table 5-14. Incorrect RAM Inside CPU Displayed Table 5-15. Self-test is Abnormal Table 5-16. Self-test Printout has Poor Quality (1) Table 5-17. Self-test Printout has Poor Quality (2) Table 5-18. Abnormal Printing in On-line Mode (1) Table 5-19. Abnormal Printing in On-line Mode (2) 5.3.2 Unit Repair - TAMA Main Control Board Table 5-21. Repair of the TAMA Board Table 5-21. Repair of the TAMA Board (Continued) Page Page Chapter 6 Maintenance List of Figures List of Tables 6.1 MAINTENANCE 6.1.1 Preventive Maintenance 6.1.2 Lubrication and Adhesive Application Table 6-1. Lubrication and Adhesive Table 6-2. Lubrication Points (lo) Table 6-3. Adhesive Application Points Figure 6-1. Correct Adhesive Application Page Appendix Table of Contents List of Figures List of Tables A.1 CONNECTOR SUMMARY HOST COMPUTER Figure A-1. Interconnection of Major Components Table A-1. Connector Summary Table A-2. Connector Pin Assignment - CN2 Table A-4. Connector Pin Assignment - 10 Table A-3. Connector Pin Assignment - I/o . CN9 LX-105O+ E: A A-7 Figure A-4. Control Panel Circuit Diagram Swl Sewice Manual Appendix Page Page Page EPSON OVERSEAS MARKETING LOCATIONS