2PK/2PL/2PM/2PN
1-4-21
(7) Unsharpness.
(8) Gray background.
(9) Dirt on the top edge or back of the paper.
Print example Causes Check procedures/corrective measures
Defective paper specifications. Replace paper with the one that satisfies the paper
specification.
Defective transfer roller installa-
tion.
The transfer roller must be supported by the bushes at
the both ends. Clean the bush to remove oil and debris.
Replace the transfer roller if necessary (See page 1-5-
30).
Defective transfer bias output. Replace the high voltage PWB or control PWB (See
page 1-5-43 or 1-5-37).
EcoPrint mode setting. The EcoPrint mode can provides faint, unsharp printing
because it acts to conserve toner for draft printing pur-
pose. For normal printing, turn the EcoPrint mode off by
using the operator panel. For details, refer to the opera-
tion guide.
Print example Causes Check procedures/corrective measures
Print density setting. The print density may be set too high. Try adjusting the
print density. For details, refer to the operation guide.
Defective potential on the drum
surface.
Replace the drum unit (See page 1-5-28).
Defective main charger grid. Clean the main charger grid (See page 1-5-29).
Defective developer roller
(developer unit).
If a developer unit which is known to work normally is
available for check, replace the current developer unit in
the machine with the normal one. If the symptom disap-
pears, replace the developer unit with a new one (See
page 1-5-27).
Print example Causes Check procedures/corrective measures
Toner contamination in various
parts.
Dirty edges and back of the paper can be caused by
toner accumulated on such parts as the paper chute
guide, paper conveying paths, the bottom of the drum
and developer unit, and the fuser unit inlet. Clean these
areas and parts to remove toner.
Defective transfer roller. If the transfer roller is contaminated with toner, clean the
transfer roller using a vacuum cleaner or by continu-
ously printing a low density page until the symptom has
faded away.
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