WorkCentre Pro 423/428
3-16
CHAPTER 3 IMAGE QUALITY TROUBLESHOOTING
3.3 Image Quality Troubleshooting
C - 8
Black lines Copy sample
j0hn3011
Symptom: Black lines (Black lines of below 1mm width appear on copies in the transverse
to copy feed direction)
Cause
Corrective action
Drum
•
Flaws on Drum surface in axial
direction (At 94mm intervals)
•
Replace
CRU.
Drum
•
Drum revolution failure
•
Check CRU coupling for skipping.
Fuser
•
Flaws on Heat Roller surface in axial
direction (At 94mm intervals)
•
Replace Heat Roller.
Fuser
•
Too high fuser temperature setting
•
Check
NVM
data.
(Diag: [20-100 to 106])
ROS Unit
•
Incident light quantity to SOS lowered
•
Check power source and voltage, then
replace ROS assembly.
Control board
•
Faulty MCU/SW PWB or IIT/IPS PWB
•
Print out built-in Test Pattern (continuous
gradation or 4-BIT line pattern) to check
and isolate faulty board.
Control board
•
Faulty CCD PWB
•
Replace
CD
PWB.
BCR
•
Flaws on the BCR surface (in 44mm
intervals)
•
Replace
CRU.
C - 9
Black spots Copy sample
j0hn3012
Symptom
Black spots
(Black spots appearing on copies)
Cause
Corrective action
Dirty Platen Glass
•
Clean Platen Glass.
Dirty Platen Cushion
•
Clean or replace Platen Cushion.
Faulty BCR
•
Replace
CRU.
Output failure of HVPS
•
Replace
HVPS.
Drum (in 94mm intervals)
•
Foreign matter on Drum
surface
•
Remove foreign matter.
Drum (in 94mm intervals)
•
Contamination, quality change
and deterioration of Drum
surface
•
Replace
CRU.
Drum (in 94mm intervals)
•
Spots on Drum surface
•
Replace
CRU.
Contamination on Heat Roller
surface (in 94mm intervals)
•
Clean Heat Roller.
Flaws on magnetic roll surface (in
55mm intervals)
•
Replace
CRU.
Toner
•
Flaws on Developer sleeve
•
Replace
CRU.
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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