Black Vertical Streaks; Unsharpness; Gray Background - Kyocera FS-1100 Service Manual

2H5/2HS

(6) Black vertical streaks.

Print example
Adhesion of oxide to main charger
wire.
ABC
123
Defective drum unit.
Defective developing roller (develop-
ing unit).

(7) Unsharpness.

Print example
Defective paper specifications.
Defective transfer roller installation.
Defective transfer bias output.
EcoPrint mode setting.

(8) Gray background.

Print example
Print density setting.
ABC
Defective potential on the drum sur-
123
face.
Defective main charger grid.
Defective developing roller (develop-
ing unit).
1-4-12
Causes
Causes
Causes
Check procedures/corrective measures
Remove the drum unit (See page 1-5-12). Slide the charger
cleaner (green) left and right 2 or 3 times to clean the charger
wire, then return it to its original position (CLEANER HOME
POSITION). Refer to the operation guide.
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 1-5-12).
Replace the developing unit (See page 1-5-11).
Check procedures/corrective measures
Replace paper with the one that satisfies the paper specifica-
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 1-5-14).
Replace the high voltage PWB or control PWB (See page 1-5-
25).
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.
Check procedures/corrective measures
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 1-5-12).
Clean the main charger grid (See page 1-5-13).
If a developing unit which is known to work normally is avail-
able for check, replace the current developing unit in the
printer with the normal one. If the symptom disappears,
replace the developing unit with a new one (See page 1-5-11).