Epson LX-1050+ I

LX-105O+

Servjce

Manual

Troubleshooting

5.3 TROUBLESHOOTING

This section describes the troubleshooting of abnormal operations and circuit board unit repair.

5.3.1 Troubleshooting of Abnormal Operation

This section describes how to detect malfunctions, how to determine the cause, and what actions to

take for various types of malfunctions. Each paragraph refers you to a detailed troubleshooting

table.

Table 5-4. Symptoms and Problems

Symptom Printer Condition

The printer does not operate at all.

Printer mechanism does not

starl

initialize, when power on. 5-5

The

LEDs

on control panel does not

The printer mechanism start initialized,

oDerate

at all. but

LEDs

does not operate.

I

5-6

The buttons on control panel does not The printer does not change state, when

operate push the button. 5-7

Carriage error displayed The printer display carriage error, when

power on. 5-8

Paper is not fed The paper is not fed from tractor.

5-9

The paper is not fed from manual feed

slot.

5-1o

Paper out displayed

\

The paper is fed, but paper out displayed

I

5-11

I I

Abnormal voltage displayed

I

The printer display abnormal voltage.

5-12

,

1

Incorrect

SRAM

disdaved

ITheprinterdisplawd incorrect

SRAM.

I

5-13

Incorrect RAM inside CPU displayed The printer display incorrect RAM inside

CPU.

5-14

Self test abnormal

The carriage is moved, but the

printhead

does not print. 5-15

Self test printout has poor quality Dot missing 5-16

I

I

Line spacing is bad

1

5-17

Abnormal print in on line mode

Bi-directional

printing position is abnormal

5-18

The printer does not print.

5-19

I

I

Data from the host is incorrectly 5-20

Rev. A5-3

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