Xerox WorkCentre Pro 423 Service Manual page 272

WorkCentre Pro 423/428
Black bands
C - 29
Copy sample
Symptom
Black bands
(Copies with black bands in the feed direction)
Cause
Faulty BCR
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Corrective action
• Replace CRU.
• Check BCR terminal of HVPS.
• Replace HVPS.
3-28 CHAPTER 3 IMAGE QUALITY TROUBLESHOOTING
Dark copies
C - 30
Copy sample
Symptom
Dark copies
(Density level of text/photo is higher than standard.)
Cause
Quality change and deterioration
of the Drum
Excessive light quantity of ROS
Density setup failure
3.3 Image Quality Troubleshooting
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Corrective action
• Replace CRU.
• Replace ROS.
• Check NVM setup.