Dots in vertical lines
Table 7-25. Causes for vertical lines of white dots
Causes for vertical lines of white dots
Cause
Solution
Transfer charging roller is worn or damaged. Replace the ETB. Calibrate the printer after
replacing the ETB. See
Calibrate now.
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.
Dirt on back of paper
Table 7-26. Causes for dirt on the back of the paper
Causes for dirt on the back of the paper
Cause
Solution
Rollers are dirty. See Table 7-38. Repetitive defect spacing for
information on identifying the roller(s) that might
be dirty. Clean the indicated roller. If the roller is
still dirty after cleaning, replace the appropriate
roller, cartridge, or assembly.
Pickup roller is dirty. Clean the roller. If the roller is still dirty after
cleaning, replace the pickup roller assembly.
Poor contact in the attaching bias contacts
between the ETB and the high-voltage PCB.
Clean the contacts. Replace them if they are still
dirty or are damaged.
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.
360 Chapter 7 Troubleshooting ENWW
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