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Epson EPL-5500 5.4.2 Print Quality Anomalies, Table 5-28. Print Quality Anomalies,

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5.4.2 Print Quality Anomalies

This section describes how to isolate possible causes of a print quality problem .

Table 5-28. Print Quality Anomalies

Symptom Possible Cause Part Name Check Item Remedy

Low image density Poor development PWB-F board — Replace the PWB-F

board.

Image transfer

problem Image transfer

unit Check to see if the

surface of image

transfer unit is

damaged.

Replace the image

transfer unit.

PWB-F board — Replace the PWB-F

board.

Defective PC drumPhotoconduc-

tor unit — Replace the

photoconductor unit.

Improper print

density setting — — Adjust the print density

using printer settings.

Foggy background Poor development Toner cartridge — Replace the toner

cartridge.

Improper charging Drum charge — Replace the PWB-F

board.

Check the wiring of the

PC drum charging bias

line.

Replace the

photoconductor unit.

Improper print

density setting — — Adjust the print density

in printer settings.

EPL-5500 Service Manual Troubleshooting

Rev. B 5-17

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