382 Troubleshooting ENWW
Dots in vertical lines
Dirt on back of paper
If defect is repetitive dirt, go to step A; if not, go to step B.
Dirt on front of paper
If the defect appears in a particular color, go to step A. if it does not appear in a particular color and
it is repetitive, go to step B or if it is not repetitive, go to step C.
Table 7-23 Causes for vertical lines of white dots
Cause Solution
Deformed/Deteriorated transfer unit or primary
transfer charging roller.
Replace the transfer unit.
Deformed/Deteriorated secondary transfer charging
roller.
Replace the secondary transfer charging roller.
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,
later in this chapter.
Table 7-24 Causes for dirt on the back of the paper
Cause Solution
A Repetitive dirt (dirty registration roller, pressure
roller, feed roller, fuser delivery roller, or face
down delivery sub roller).
Refer to the Repetitive defect cause table, later in
this chapter, to identify the roller with which the
problem is associated. Clean the dirty roller.
Replace the roller if the dirt does not come off.
B Dirty cassette pickup roller, feed guide, fuser inlet
guide, and fuser delivery guide.
Clean any dirty places on the rollers. Replace the
roller if the dirt does not come off.
Table 7-25 Causes for dirt on the front of the paper
Cause Solution
A Defective cartridge (deteriorated toner or
scratches on the developing cylinder,
photosensitive drum, or primary charging roller).
Replace the cartridge of the color that matches the
defect.
B Repetitive dirt (dirty registration sub roller, fuser
sleeve, feed sub roller, or face down delivery
roller).
Refer to the Repetitive defect cause table, later in
this chapter, identify the roller with which the
problem is associated. Clean the dirty roller.
Replace the roller if the dirt does not come off.
C Dirty multi-purpose tray pickup roller. Clean dirty places on the roller. Replace the roller if
the dirt does not come off.
Defective transfer unit. Check the transfer unit surface. If scratched or
dented, replace the transfer unit.
Defective transfer unit cleaning blade Replace the transfer unit.
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