Xerox WorkCentre Pro 423 Service Manual page 265

Distortion (Hunting) Copy sample
C - 17
Symptom: Distortion (Hunting) (Copies with wavy lines in copy feed direction, especially,
vertical scale lines.)
Cause
Detached or wavy documents
Faulty Carriage Cable Capstan
Faulty ROS Motor
Worn or faulty DADF Document
Feed Rollers/Gears
WorkCentre Pro 423/428
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Corrective action
• Load documents again.
• Replace IIT Capstan Shaft.
• Replace ROS Assy.
• Replace Roller/Gear.
Banding Copy sample
C - 18
Symptom: Banding (Copies with striped images occurring regularly in the copy feed
direction of half tone copies)
[Check]
Print out built-in test pattern [23-8], [23-9] to check the cycle of occurrence.
Cause
Vibration of ROS Motor
Vibration of Drum
3-21 CHAPTER 3 IMAGE QUALITY TROUBLESHOOTING
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Corrective action
• Replace ROS Assy.
• Replace MCU/SW PWB.
• Check Main Drive Assy. (PL 1.1)
• Replace CRU.
3.3 Image Quality Troubleshooting