Causes for poor fusing
Cause
Solution
Fuser is not within nip width specifications. Replace the fuser.
Fuser sleeve is scarred or damaged. Replace the fuser.
Pressure roller is scarred or damaged. Replace the fuser.
Thermistor is deteriorated. Replace the fuser.
DC controller PCB is defective. Replace the DC controller PCB. Calibrate the
printer after replacing the DC controller. See
Calibrate now.
Distortion or blurring
Table 7-35. Causes for distortion or blurring
Causes for distortion or blurring
Cause
Solution
Color plane registration is out of specification. Calibrate the printer from the Print Quality menu.
See
Calibrate now.
ETB is defective. If the ETB belt does not rotate smoothly, replace
the ETB. Calibrate the printer after replacing the
ETB. See
Calibrate now.
ETB motor drive gear is worn or damaged. Replace the ETB motor.
Drum motor drive gear is worn or damaged. Replace the drum motor for the affected color.
Color registration detection unit is defective. Replace the color registration detection unit.
Laser/scanner unit is defective. Replace the laser/scanner for the affected color.
Calibrate the printer after replacing the laser/
scanner. See
Calibrate now.
DC controller PCB is defective. Replace the DC controller PCB. Calibrate the
printer after replacing the DC controller. See
Calibrate now.
Table 7-34. Causes for poor fusing (continued)
364 Chapter 7 Troubleshooting ENWW
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