Black Vertical Streaks; Unsharpness; Gray Background - Kyocera FS-3040MFP Service Manual

(6) Black vertical streaks.

Print example
Flawed main charger roller
ABC
Defective drum unit.
123
Defective developing roller
(developing unit).

(7) Unsharpness.

Print example
Defective paper specifica-
tions.
Defective transfer roller instal-
lation.
Poor contact of engine PWB's
transfer bias output terminal
and machine's contact
(spring).
EcoPrint mode setting.

(8) Gray background.

Print example
Print density setting.
ABC
123
Defective potential on the
drum surface.
Defective main charger unit.
Defective developing roller
(developing unit).
Causes
Replace the main charger unit (see page 1-5-26).
A streak of toner remaining on drum after printing means
that the cleaning blade (in the drum unit) is not working
properly. Replace the drum unit (see page 1-5-26).
Replace the developing unit (see page 1-5-25).
Causes
Replace paper with the one that satisfies the paper specifi-
cation.
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 1-5-27).
Check the installation position of the engine PWB.
See page 1-4-15, refer to figure 1-4-5.
The EcoPrint mode can provides faint, unsharp printing
because it acts to conserve toner for draft printing purpose.
For normal printing, turn the EcoPrint mode off by using
the operator panel. For details, refer to the operation
guide.
Causes
The print density may be set too high. Try adjusting the
print density. For details, refer to the operation guide.
Replace the drum unit (see page 1-5-26).
Replace the main charger unit (see page 1-5-26).
Replace the developing unit (see page 1-5-25).
Check procedures/corrective measures
Check procedures/corrective measures
Check procedures/corrective measures
1-4-18
2LW/2LX