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Epson EPL-5500W Figure 2-13. Fuser Control Circuit, Figure 2-14. Temperature for Fuser Control Procedure

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2.1.2.3 Fuser Control

The heater lamp, powered by AC voltage, heats the fuser. When the power supply board receives a FUSER

signal from the main board (C180 MAIN), the power supply board (PWB-E) supplies the AC voltage to the

heater lamp. This AC voltage is cut by an interlock switch when the case is open.

Thermistor TH1 detects the surface temperature of the upper fusing roller and inputs that analog voltage to

the 77-pin chip, IC201. Based on this temperature data, the heater lamp on/off signal (the FUSER signal) is

output from the 54-pin chip, IC201, causing heater lamp H1 to turn on or off to control the fusing

temperature. When the heater lamp is not turned off even if the thermistor detects a high temperature

malfunction (which occurs if the surface temperature of the upper fusing roller exceeds 200º C), the signal

from the 75-pin chip, IC201, changes from H to L to turn off the heater lamp forcibly.

The following figure shows the fuser temperature control procedure.

1. Warm up: After printer initialization, printer warm up starts, and the heater lamp turns on until

the upper fusing roller’s temperature reaches approximately 172º C (342º F).

2. Standby: Instandby mode, the upper fusing roller’s temperatu re is controlled to maintain 156º C

(313º F). When this condition continues for 3 minutes, the printer goes into standby

mode at low temperature.

3. Print cycle: When the printer receives the printing command from the controller, the upper

fusing roller is controlled to maintain 172º C (342º F).

4. Standby at low temperature: The upper fusing roller is controlled to maintain 112º C (234º F).

C180 MAIN

IC201

77

54

75

Analog Voltage Detected by the

Thermistor (TH1)

5 VDC

L

H

IC202B

5

64

L

H

HH

2

31

IC202A 43

L

LH1:ON

HH1:OFF

1

2

1

5

1

5

TH1

Thermistor

PWB-E 1

2

3

H1

TF1

Heater Lamp

Thermal Fuse

Heater Lamp

ON/OFF Signal

CN202

CN207

CN1E

CN3E

Figure 2-13. Fuser Control Circuit

Temperature

(Degrees C)

172

156

112

Power On

Warm up Standby Standby with Low

Temperature

Time

When a print is made immediately after warm up

Figure 2-14. Temperature for Fuser Control Procedure

Operating Principles EPL-5500W Service Manual

2-10 Rev. A

Contents

Main Page NOTICE - i - Copyright 1995 by SEIKO EPSON CORPORATION Nagano, Japan PRECAUTIONS DANGER - ii - WARNING DANGER SAFETY INFORMATION For United States Users; - iii - For Other Countries Users; For Denmark Users; - iv - For Norway Users; Laser Safety Labels For United State For Europe Page PREFACE Page Page Chapter 1 General Description Page Page 1.1 FEATURES Figure 1-1. Exterior View of the EPL-5500W Page 1.2 SPECIFICATIONS 1.2.1 Basic Specifications Table 1-2. Paper Feed Methods Table 1-3. Paper Types Table 1-4. Usability of Special Papers Figure 1-2. Printable Area Printable Area 4.0 mm 4.0 mm 4.0 mm4.0 mm 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 1.2.6 Applicable Standards Safety Standards Safety Regulations (Laser Radiation) EMI Others Page 1.3 INTERFACE SPECIFICATIONS 1.3.1 Parallel Interface 1.4 OPERATING INSTRUCTIONS 1.4.1 Control Panel Figure 1-3. Control Panel Indicator Lights 1.4.2 Display of Messages 1.4.2.1 Status Messages Table 1-6. Status Messages 1.4.2.2 Error Messages Table 1-7. Error Messages Table 1-7. Error Messages (Continued) 1.4.3 Printing Resolution Host PC Capability Dependency Table 1-8. Host PC Conditions 1.5 MAIN COMPONENTS Figure 1-4. Main Components 1.5.1 C180 MAIN Board Figure 1-5. C180 MAIN Board Page Page Page Chapter 2 Operating Principles Page 2.1 ENGINE OPERATION Figure 2-1. Main Components 2.1.1 Print Process 2-2 Rev. A Figure 2-2. Print Process Diagram 2.1.1.1 Paper Feeding Figure 2-3. Paper Feeding from the Paper Feed Tray Paper Feeding Tray (Standard Tray) 2.1.1.2 Drum Charge Figure 2-4. Drum Charge 2.1.1.3 Laser Exposure 2.1.1.4 Development Figure 2-5. Laser Exposure Figure 2-6. Development 2.1.1.5 Image Transfer 2-6 Rev. A Lower Fusing Roller Figure 2-7. Image Transfer Thermal Fuse Thermistor Upper Fusing Roller Heater Lamp Paper Figure 2-8. Fusing 2.1.2 Engine Control Rev. A 2-7 Figure 2-9. Engine Controller Connection Diagram 2.1.2.1 Main Motor Functions and Control Figure 2-10. Gear and Roller Positions 2-8 Rev. A M1 Main Motor Board C180 MAIN 2.1.2.3 Fuser Control Figure 2-13. Fuser Control Circuit Figure 2-14. Temperature for Fuser Control Procedure Figure 2-15. Scanner Motor Control Circuit 2.1.2.4 Scanner Motor Control 2.1.2.5 Laser Diode Drive Figure 2-16. Laser Diode Drive Circuit L DATA Figure 2-18. Laser Emission Power Adjustment Timing Forced Laser Diode ON VIDEO Figure 2-19. High-Voltage Supply Block Diagram Figure 2-20 shows theprint process. 2-14 Rev. A Development Figure 2-22 is the end of the print sequence. Figure 2-20. Print Process Figure 2-21. Print Sequence (Start) Figure 2-22. Print Sequence (End) 2.1.2.7 Fan Motor Control Figure 2-23. Power Supply Circuit Block Diagram 2.1.2.8 Power Supply Circuit Function and Safety Protection 2.2 PARALLEL INTERFACE CONTROLLER OPERATION 2.2.1 C180 MAIN Board Operation Figure 2-24. Parallel Interface Controller Section Figure 2-25. C180 MAIN Board Block Diagram Page Chapter 3 Disassembly and Assembly Page 3.1 GENERAL INFORMATION 3.1.1 Precautions for Disassembly/Assembly 3.1.2 Tools Table 3-1. Tools 3.1.3 Small Parts Table 3-2. Abbreviations Used for Screws Table 3-3. Screw Types and Abbreviations 3.1.4 Service Checks after Repair Table 3-4. Checks after Repair 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 Removal Figure 3-4. Removing the Optical Unit Page Page Page Page Page 3.2.3.6 Fusing Unit Removal Figure 3-15. Gear and Spring Position Figure 3-16. Removing the Fusing Guide Plate Page Page 3.2.3.7 Fusing Unit Disassembly Figure 3-21. Removing the Heater Lamp Page Page Page Page Page Page 4.1 ADJUSTMENTS 4.1.1 Print Position Adjustment Figure 4-1. Print Position Adjustment 4.2 mm Leading Edge EPL-5500W Service Manual Adjustments Chapter 5 Troubleshooting List of Tables 5.1 OVERVIEW 5.2 SELF-DIAGNOSTIC FUNCTION AND TOOL Table 5-1. Error Codes 5.3 TROUBLESHOOTING 5.3.1 Troubleshooting of Abnormal Operations Table 5-2. Symptoms and Reference Tables Table 5-3. The Printer Does Not Operate at All Table 5-4. Both LED Lights Do Not Come On Table 5-5. Clear Paper Jam (1) Table 5-6. Clear Paper Jam (2) Table 5-6. Clear Paper Jam (2) (Continued) Table 5-7. Check Toner & Cover Table 5-8. Service Error (1) Table 5-9. Service Error (2) Table 5-10. Service Error (3) Table 5-11. Service Error (4) 5.4.2 Print Quality Anomalies Table 5-12. Print Quality Anomalies Page Table 5-12. 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 6.1.1.2 Replacement of Consumables Maintenance EPL-5500W Service Manual 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 List of Tables A.1 CONNECTOR PIN ASSIGNMENTS Rev. A A-1 Figure A-1. Connector Connections SL2 TH1 Table A-1. Board Connector Summary Main Board (C180 MAIN Board) Power Supply Board (PWB-E Board) High-Voltage Supply Board (PWB-FBoard) A.1.1 Main Board (C180 MAIN Board) Table A-2. CN2 Pin Assignments Table A-3. CN202 Pin Assignments Table A-4. CN203 Pin Assignments Table A-5. CN204 Pin Assignments Table A-6. CN205 Pin Assignments Table A-7. CN206 Pin Assignments Table A-8. CN207 Pin Assignments Table A-9. CN208 Pin Assignments Table A-10. CN209 Pin Assignments Table A-11. CN210 Pin Assignments Table A-12. CN211 Pin Assignments Page Page Page Figure A-3. C180 MAIN Circuit Diagram (2/2) Rev. A A-9 Figure A-4. PWB-E (120 V) Circuit Diagram A-10 Rev. A Figure A-5. PWB-E (220/240 V) Circuit Diagram Rev. A A-11 Page Page EPSON OVERSEAS MARKETING LOCATIONS As of October 1995