Xerox WorkCentre Pro 423, Service Manual

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WorkCentre Pro 423/428 3-20 CHAPTER 3 IMAGE QUALITY TROUBLESHOOTING
3.3 Image Quality Troubleshooting
C - 15
Smear Copy sample
j0hn3018
Symptom: Smear (Copies with blurred images)
•
Smear represents blurred images caused by vibration or speed changes of Drum and paper
in the transfer process.
•
Check paper transport drive mechanism, mainly drum and paper feed when smear problem
occurs.
Cause Corrective action
Faulty DTS
•
Replace DTS.
Fuser
•
Foreign matter or damage of
Heat Roller Gears
•
Clean or replace the Gears.
Fuser
•
Deformed Pressure Roller
•
Replace Pressure Roller.
Damage of Paper Transport Gear,
Pulley or Belt
•
Replace them.
Faulty rotation of Drum
•
Check CRU Coupling.
•
Replace CRU.
Faulty Main Drive Assy
•
Replace Main Drive Assy.
Foreign matter in Transfer area
•
Remove foreign matter.
R/H Chute
•
R/H Chute is loose/detached or
binding.
•
Repair/Replace the Chute.
BTR feed fault
•
BTR is dirty.
•
Replace BTR.
C - 16
Jitter/Data error Copy sample
j0hn3019
Symptom: Jitter/Data error (Zigzag lines in copy feed direction)
•
FAX receive: Jitter or data error of receive data
•
Copy mode: Jitter of print data
Cause Corrective action
Jitter/data error during Fax receive
•
Data error caused by noise of
telephone line
•
Print out built-in Test Pattern to check and isolate
faulty board.
Jitter/data error during Fax receive
•
Jitter/data error caused by poor
electrical connection of NCU
•
Check NCU PWB for poor electrical connection.
(BSD 19.2)
Jitter/data error during Fax receive
•
Faulty modem in MF MAIN
PWB
•
Replace MF MAIN PWB. (PL 7.3)
Jitter in copy mode
•
Faulty MCU/SW PWB or
IIT/IPS PWB
•
Print out built-in Test Pattern to check and isolate
faulty board.
Jitter in copy mode
•
Faulty SOS sensor or ROS
Drive PWB (Occurs at the
same level in the inside and
outside.)
•
Replace ROS Assy.
Jitter in copy mode
•
Faulty ROS Motor
•
Replace ROS Assy.
•
Replace MCU/SW PWB.