Dropouts; Black Dots; Black Horizontal Streaks - Kyocera FS-3040MFP+ Service Manual

(3) Dropouts.

Print example
Defective developing roller
ABC (developing unit).
123
Defective drum unit.
Defective fuser unit (heat
roller or press roller).
Defective paper
specifications.
Defective transfer roller instal-
lation.
Defective transfer bias output. Replace the engine PWB (see page 1-5-30).

(4) Black dots.

Print example
Defective drum unit or devel-
oping unit.
ABC
123

(5) Black horizontal streaks.

Print example
Defective drum unit's ground.
ABC
123
Defective drum unit.
Causes
If the defects occur at regular intervals of 39 mm/1
(see page 2-4-3), the problem may be the damaged devel-
oping roller (in the developing unit). Replace the develop-
ing unit (see page 1-5-25).
If the defects occur at regular intervals of 94 mm/3
(see page 2-4-3), the problem may be the damaged drum
(in the drum unit). Replace the drum unit (see page 1-5-
26).
If the defects occur at regular intervals of 82 mm/3
93 mm/3
damaged heat roller or press roller (in the fuser unit).
Replace fuser unit (see page 1-5-29).
Paper with rugged surface or dump tends to cause drop-
outs. Replace paper with the one that satisfies the paper
specifications.
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).
Causes
If the defects occur at regular intervals of 94 mm/3
(see page 2-4-3), the problem may be the damaged drum
(in the drum unit). Replace drum unit (see page 1-5-25).
If the defects occur at random intervals, the toner may be
leaking from the developing unit or drum unit. Replace the
developing unit or drum unit (see page 1-5-25 or 1-5-26).
Causes
Defective drum unit's ground. The contact (spring) in the
drum unit and its counter part, the drum grounding terminal
in the printer, must be in a good contact.
See page 1-4-16, refer to figure 1-4-5
Replace the drum unit (see page 1-5-26).
Check procedures/corrective measures
" (see page 2-4-3), the problem may be the
11/16
Check procedures/corrective measures
Check procedures/corrective measures
1-4-18
2MF/2MG
"
9/16
"
11/16
", or
1/4
"
11/16