WorkCentre Pro 423/428
3-12
CHAPTER 3 IMAGE QUALITY TROUBLESHOOTING
3.3 Image Quality Troubleshooting
Cause
Corrective action
Inappropriate AE setup data
•
Check NVM setup data. [21-37]
Inappropriate shading
compensation coefficient
•
Check NVM setup data. [21-56][21-57]
Control Board
•
Faulty MCU/SW PWB or
IIT/IPS PWB
•
Print out built-in Test Pattern (continuous
gradation) to check and isolate faulty board.
Control Board
•
Connection failure of MCU/SW
PWB, IIT/IPS PWB, MF MAIN
PWB
•
Check that the connections are secure.
Control Board
•
Faulty CCD PWB
•
Replace CCD PWB.
Density setup failure
•
Check
NVM
setup
data.
(Diag [21-5 to 57])
C - 2
White copies
Copy sample
j0hn3005
Symptom
White copies
(Output of entirely white copies without characters and drawings)
Cause
Corrective action
Drum
•
Drum revolution failure
•
Check the CRU drive structure.
Drum
•
Quality change and
deterioration
•
Replace
CRU.
Drum
•
Magnetic roller revolution
failure
•
Check CRU and drive structure.
Developer bias
•
Output failure of HVPS
•
Replace
HVPS.
Developer bias
•
Discontinuity of magnetic roller
•
Check continuity of magnetic roll.
Interrupted laser path
•
Check for foreign matter in the laser path between
ROS and drum.
Control board
•
Faulty MCU/SW PWB or
IIT/IPS PWB
•
Print out built-in Test Pattern to check and isolate
faulty board.
Control board
•
Connection
failure
between
PWBs
•
Check connectors for connection.
Control board
•
Faulty CCD PWB
•
Replace CCD PWB.
Poor contact of BTR
•
Repair or replace BTR.
Summary of Contents for WorkCentre Pro 423
Page 2: ......
Page 3: ...WorkCentre Pro 423 428 6HUYLFH 0DQXDO...
Page 6: ......
Page 8: ......
Page 9: ...INTRODUCTION...
Page 10: ......
Page 24: ...WorkCentre 423 428 03 02 INTRODUCTION 14 7 Translation of Warnings...
Page 25: ...CHAPTER 1 SERVICE CALL PROCEDURE...
Page 26: ......
Page 28: ...WorkCentre Pro 423 428 1 2 CHAPTER 1 SERVICE CALL PROCEDURE 03 02 1 1 Trimming...
Page 31: ...CHAPTER 2 TROUBLESHOOTING...
Page 32: ......
Page 76: ...WorkCentre Pro 423 428 2 44 CHAPTER 2 TROUBLESHOOTING 03 02 2 3 Level 2 Troubleshooting...
Page 243: ...CHAPTER 3 IMAGE QUALITY TROUBLESHOOTING...
Page 244: ......
Page 273: ...CHAPTER 4 DISASSEMBLY ASSEMBLY AND ADJUSTMENT...
Page 274: ......
Page 329: ...CHAPTER 5 PARTS LIST...
Page 330: ......
Page 415: ...03 02 5 2 Parts List WorkCentre Pro 423 428 5 85 CHAPTER 5 PARTS LIST...
Page 416: ...CHAPTER 6 GENERAL...
Page 417: ......
Page 456: ...CHAPTER 7 ELECTRICAL WIRING DIAGRAMS...
Page 457: ......
Page 476: ...CHAPTER 8 ACCESSORIES...
Page 477: ......
Page 535: ...WorkCentre Pro 423 428 8 58 CHAPTER 8 ACCESSORIES 03 02 8 22 Stamp Kit Red...
Page 536: ...CHAPTER 9 BSD Block Schematic Diagram...
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