Epson EPL-5500 6.1 MAINTENANCE

6.1 MAINTENANCE

The EPL-5500 is a page printer that uses an electrophotographic printing method. Unlike most

impact or ink-jet printers, the key components in the electrophotographic process are integrated into

two expendable units (the photoconductor unit and toner cartridge). Therefore, periodic

replacement of them is essential to ensure high-quality output. Other maintenance items are also

described in this chapter, which is divided into two secti ons: user maintenance (preventive

maintenance) and service maintenance (repair).

6.1.1 User Maintenance

Users can achieve maximum print quality from the printer by following the procedures below:

6.1.1.1 Cleaning

This section describes the cleaning required for optimal print quality.

❒External Cleaning

Be sure to disconnect the printer from the power outlet before cleaning it. Wipe the cover and

external parts of the printer with a damp cloth that has been soaked in a neutral cleaning solution.

❒Internal Cleaning

Be sure the printer has been disconnected from the power supply and that the fusing unit has

cooled down. If the electrode comb of the image transfer unit is dirty, clean it with a special tool,

using the following steps:

1. Pick up the electrode comb cleaner from the upper unit.

2. Wipe the electrode comb surface from end to end with the electrode comb cleaner several

times.

Figure 6-1. Position of the Special Tool

Electrode Comb Cleaner

Cleaner section

Pre-image Transfer Roller

Image Transfer Rear

Guide

Figure 6-2. Cleaning the Electrode Comb

EPL-5500 Service Manual Maintenance

Rev. B 6-1

Contents

Main Page NOTICE - i - General Notice: Copyright 1995 by SEIKO EPS ON CORPORATION Nagano, Japan PRECAUTIONS DANGER - ii - WARNING DANGER SAFETY INFORMATION For United States Users; - iii - For Other Countries Users; For Denmark Users; - iv - For Finland, Sweden Service People For Norway Users; Laser Safety Labels [Label on rear printer case] Page PREFACE REVISION SHEET - vii - Chapter 1 General Description Page Page 1.1 FEATURES Figure 1-1. Exterior View of the EPL-5500 Table 1-1. Options for the EPL-5500 General Description EPL-5500 Service Manual 1.2 SPEC IF ICATIONS 1.2.1 Basic Specifications Table 1-3. Paper Types Table 1-2. Paper Feed Methods Figure 1-2. Printable Area Table 1-4. Usability of S p ecial Papers 1.2.2 Electrical Specifications Table 1-5. Electrical Requirements and Ranges 1.2.3 Reliability Specifications 1.2.4 Environmental Conditions for Operation (Including Imaging Cartridge) 1.2.5 Environmental Conditions for Storage and Transportation General Description EPL-5500 Service Manual 1.2.6 Applicable Stan dards Safety Standards Safety Regulations (Laser Radiation) EMI Others 1.2.9 Software Specifications Table 1-6. Differences between EPSON GL/2 and GL/2 in the HP LaserJet 4 Emulation Table 1-7. Built-in Fonts Table 1-7. Built-in Fonts (Continued) 1.3 INTERFACE SPECIFICATIONS 1.3.1 Parallel Interface Figure 1-3. Compatibility Mode Signal Timing Table 1-8. Parallel Interface Pin Assignments 1.3.1.2 Reverse Mode Table 1-9. Parallel Interface Pin Assignment Figure 1-4. Parallel Interface State Switch Diagram Figure 1-4 shows the switch diagram for the parallel interface state . 1-12 Rev. B Figure 1-5. Negotiation Timing Chart Figure 1-6. Timing Chart for Data Transfer Figure 1-7. Termination Timing Chart Figure 1-8. Timing Chart for Interrupts 1.3.2 Serial Interface Table 1-10. Serial Interface Pin Assignments Handshaking Protocol 1.3.3 Optional LocalTalk Interface Table 1-11. LocalTalk Interface Pin Assignments 1.4 OPERATING INSTRUCTIONS 1.4.1 Control Panel Figure 1-9. Control Panel LED (Yellow) LED (Red) Button Functions of Pressing the Button 1.4.2 Printer Settings Fu nctions Table 1-12. Printer Settings Page Table 1-12. Printer Settings (Co ntinued) 1.4.3 Service Mode Table 1-13. Service Mode Select Timing 1.4.3.1 Hexadecimal Dump Mode 1.4.3.2 EEPROM Initialize Mode 1.4.3.3 Factory Reset Mode Table 1-14. Default Settings Codes Page Table 1-14. Default Settings Code (Continued) 1.4.4 Display of Messages 1.4.4.1 Status Messages 1.4.4.2 Error Messages Table 1-15. Error Messages 1.4.4.3 Service Call Error Message 1.4.5 Printer Sharing 1-28 Rev. B Figure 1-11. Auto Sense Mode 1.4.5.1 Port Fixed Mode 1.4.5.2 Auto Sense Mode 1.4.6 Emulation Mode Switch Function 1.4.6.1 Emulation Switch by SPL Figure 1-13. Intelligent Emulation Switch EJL: EPSON Job Language PJL: Printer Job Language R 1 inch (When 600 DPI printing) Figure 1-14. Effect of BiRITech Figure 1-15. RITech Adjustment 1.4.8 Toner Save Mode 1.4.9 Optional Memory Figure 1-16. Toner save Mode Upper Edge Left Edge 1.5 MAIN COMPONENTS Figure 1-17. Comp onent Layout 1.5.1 C169 MAIN-B Board Table 1-16. Differences in Components for the C169 MAIN-B Bo ard Figure 1-18. C169 MAIN-B Board Page Page Page Chapter 2 Operating Principles Page 2.1 ENGINE OPERATION Figure 2-1. Main Components 2.1.1 Print Process Figure 2-2. Print Process Diagram 2.1.1.1 Paper Feeding Figure 2-3. Paper Feeding from the Pa per Feed Tray Paper Feeding Tray (Standard Tray) Second Paper Feed Unit (Optional Lower Cassette) 2.1.1.2 Drum Charge Figure 2-4. Paper Feeding from the Lower Paper Cassette Figure 2-5. Drum Charge Operating Principles EPL-5500 Service Manual 2.1.1.3 Laser Exposure 2.1.1.4 Development Figure 2-6. Laser Exposure Figure 2-7. Development 2.1.1.5 Image Transfer 2-6 Rev. B Lower Fusing Roller Figure 2-8. Image Transfer Thermal Fuse Thermistor Upper Fusing Roller Heater Lamp Paper Figure 2-9. Fusing 2.1.2 Engine Control Rev. B 2-7 Figure 2-10. Engine Controller Connecting Diagram 2.1.2.1 Main Motor Functions and Control 2-8 Rev. B Fig.2-11. Gear and Roller Positions 2.1.2.2 Paper Take-Up Sensor and Paper Exit Sensor Main Mot or M 1 B A A 2 Figure 2-14. Fuser Control Circ uit Figure 2-15. Temperature for Fuser Control Procedure Page Figure 2-16. Scanner Motor Control Circuit 2.1.2.4 Scanner Motor Control 2.1.2.5 Laser Diode Drive Figure 2-17. Laser Diode Drive Circuit L DATA Figure 2-19. Laser Emission Powe r Adjustment Timing Forced Laser Diode ON VIDEO Figure 2-20. High-Voltage Supply Block Diagram Figure 2-21 shows the print process. Rev. B 2-15 Development Figure 2-23 is the end of the print sequence. Figure 2-21. Print Process Figure 2-22. Print Sequence (Start) Figure 2-23. Print Sequence (End ) 2.1.2.7 Fan Motor Control 2.1.2.8 Power Supply Circuit Function and Safety Protection Figure 2-24. Power Supply Circuit Block D iagram 2.2 VIDEO CONTROLLER OPERATION Rev. B 2-17 Figure 2-26. C169 MAIN-B Board Block Diagram 2.2.1 C169 MAIN-B Board Operation C169 MAIN-B Board Video Controller Section Engine Controller Section Table 2-1. Functions of C169 MAIN-B Board Main Elements Figure 2-27. Data Flow Diagram 2.2.1.1 Reset Circuit 2.2.1.2 Bus Control Circuit Figure 2-28. Reset Circuit CPU MB86933H (IC1) Figure 2-29. Bus Control Circuit E05A91 (IC2) 2.2.1.3 Interrupt Contr ol Figure 2-30. DRAM Management 2.2.1.4 DRAM Management E05A91 (IC2) 2.2.1.5 Parallel Interface Circuit E05A93 (IC4) Figure 2-31. Parallel Interface Circuit 2.2.1.6 Video Interface Chapter 3 Disassembly and Assembly Page 3.1 GENERAL INFORMATION 3.1.1 Precautions for Disassembly/Assembly WARNING 3.1.2 Tools Table 3-1. Tools 3.1.3 Small Parts Table 3-2. Screw Types and Abbreviations 3.1.4 Service Checks after Repair Table 3-3. Checks after Repair EPL-5500 Service Manual Disassembly and Assembly 3.2 DISASSEMBLY AND ASSEMBLY 3.2.1 Housing Removal Figure 3-1. Removing the Housing 3.2.1.1 Case Removal Page 3.2.3 Disassembling the Engine 3.2.3.1 Optical Unit Rem oval Figure 3-4. Removing the Optical Unit Page Page Page Page Page 3.2.3.6 Fusing Unit Removal When rehooking the spring, be sure to hook it at the correct position. Figure 3-15. Gear and Spring Position Figure 3-16. Removing the Fusing Guide Plate Page Page Page Page Page Figure 3-26. Removing the G-Rings Figure 3-27. Removing the Upper Fusing Roller Page Page 3.2.3.9 Paper Take-Up Sensor and Paper Take-Up So lenoid Removal ASSEMBLY POINT Screw (#6) Figure 3-33. Removing the Paper Guide ASSY. Ground plate Figure 3-32. Removing the Ground Plate ASSEMBLY POINT Figure 3-34. Removing the Gears Figure 3-35. Removing the Paper Take-Up Roller Page 4.1 ADJUSTMENTS 4.1.1 Print Position Adjustment Figure 4-1. Print Position Adjustment Default Settings EPSON EPL-5500 Status Sheet Leading Edge EPL-5500 Service Manual Adjustments Chapter 5 Troubleshooting 5.1 OVERVIEW 5.2 SELF-DIAGNOSTIC FUNCTION 5.2.1 SOFT ERROR Table 5-1. SOFT ERROR Code List 5.2.2 Service Call Error Table 5-2. Service Call A Error Service call B error Page Table 5-3. Service Call B Error Page 5.3 TROUBLESHOOTING 5.3.1 Troubleshooting of Abnormal Operation Table 5-4. Symptoms and Reference Tables Table 5-5. The Printer Does Not Operate at All Table 5-6. Both LED Lights Do Not Come On Table 5-7. The LED Does Not Come On (1) Page Table 5-8. The LED Does Not Come On (2) Table 5-8. The LED Does Not Come On (2) (Continued) Table 5-9. The LED Does Not Come On (3) Table 5-10. The LED Does Not Come On (4) Table 5-11. Software Errors Table 5-14. The Scanner Motor Error Table 5-12. Fusing Unit Error Table 5-13. The Fan Motor Error Page Table 5-15. Laser Light Error Table 5-16. Communication Err or Table 5-17. EEPROM Write Error Table 5-18. Engine Initialize Error Table 5-19. C1000 or C1001 Error Table 5-21. C1003 Error Table 5-22. C1130 Error Table 5-23. C1170 Error Table 5-24. C1180 Error Table 5-25. C1300 or C1310 Error Table 5-26. C1320 Error Table 5-27. C1990 Error 5.4.2 Print Quality Anomalies Table 5-28. Print Quality Anomalies Page Table 5-28. Print Quality Anomalies (Continued) Chapter 6 Maintenance Page 6.1 MAINTENANCE 6.1.1 User Maintenance Figure 6-2. Cleaning the Electrode Comb 6.1.1.1 Cleaning Figure 6-1. Position of the Special Tool 6.1.2 Service Maintenance 6.1.2.1 Periodic Service Maintenance Table 6-1. Periodic Service Maintenance 6.1.2.2 Cleaning Table 6-2. Cleaning Parts and Procedures Page Appendix A Reference Materials A.1 CONNECTOR PIN ASSIGNMENTS Figure A-1. Connections for the Video Controller M1 Figure A-2. Cable Connections for the Engine Controller A-2 Rev. A TH1 CHECK1 M2 Table A-1. Board Connector Summary Main Board (C169 MAIN-B Board) Power Supply Board (PW B- E Board) High-Voltage Supply Board (PWB-F Board) A.1.1 Main Board (C169 MAI N-B Board) Table A-2. CN2 Pin Assignments Table A-2. CN2 Pin Assignments (Continued) Table A-3. CN4 Pin Assig nm ents Table A-3. CN4 Pin Assignments (Continued) Table A-4. CN5 Pin Assignm ents Table A-4. CN5 Pin Assignments (Continued) Table A-5. CN202 Pin Assignments Table A-6. CN203 Pin Assignments Table A-7. CN204 Pin Ass ignments Table A-8. CN205 Pin Ass ignments Table A-9. CN206 Pin Ass ignments Table A-10. CN207 Pin Assi g nments Table A-11. CN208 Pin Assi g nments Table A-12. CN209 Pin Assi gnments Table A-13. CN210 Pin Assi gnments Table A-14. CN211 Pin Assi gnments A.2 CIRCUIT DIAGRAMS Figure A-3. C169 MAIN- B Ci rcuit Diagram (1/2) Rev. A A-11 Figure A-4. C 169 MAIN-B Circuit Diagram (2/2) Rev. A A-13 Figure A-5. PWB-E (120 V) Circuit Diagram A-14 Rev. A + Figure A-6. PWB-E (220/ 240 V) Circuit Diagram Rev. A A-15 Page Page EPSON OVERSEAS MARKETING LOCATIONS As of October 1995