Causes for one color printing light
Cause
Solution
Photosensitive drum is worn. Replace the print cartridge for the affected color.
High-voltage PCB is defective. Replace the high-voltage PCB.
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.
Dark image
Table 7-21. Causes for dark images
Causes for dark images
Cause
Solution
Image density is not adjusted correctly. Decrease the density for each color.
Color registration detection unit is dirty. Clean the lens on the color registration detection
unit.
Color registration detection unit is defective. Replace the color registration detection unit.
DC controller PCB is defective. Replace the DC controller PCB. Calibrate the
printer after replacing the DC controller. See
Calibrate now.
Dark color
Table 7-22. Causes for one color printing dark
Causes for one color printing dark
Cause
Solution
Poor contact in the drum ground, primary
charging bias, and developing bias contacts of
the high-voltage PCB and the print cartridge.
Clean the contacts on the cartridge for the
affected color. If they are still dirty after cleaning,
or if they are damaged, replace the cartridge.
High-voltage PCB is defective. Replace the high-voltage PCB.
DC controller PCB is defective. Replace the DC controller PCB. Calibrate the
printer after replacing the DC controller. See
Calibrate now.
Table 7-20. Causes for one color printing light (continued)
358 Chapter 7 Troubleshooting ENWW
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