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(4) Black dots.
Print example
Defective drum unit or developer
ABC
unit.
123
(5) Black horizontal streaks.
Print example
Defective drum unit's ground.
ABC
123
Defective drum unit.
(6) Black vertical streaks.
Print example
Adhesion of oxide to main char-
ABC
ger wire.
123
Defective drum unit.
Defective developer roller
(developer unit).
Causes
Causes
Causes
1-4-20
Check procedures/corrective measures
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-
5-28).
If the defects occur at random intervals, the toner may
be leaking from the developer unit or drum unit. Replace
the developer unit or drum unit (See page 1-5-27 or 1-5-
28).
Check procedures/corrective measures
Check that the drum shaft and the grounding tab
(machine) are in good contact. Apply the grounding tab
a small amount of electroconductive grease as required.
Replace the drum unit (See page 1-5-28).
Check procedures/corrective measures
Remove the drum unit (See page 1-5-28). Slide the
charger cleaner (green) left and right 2 or 3 times to
clean the charger wire, then return it to its original posi-
tion (CLEANER HOME POSITION). Refer to the opera-
tion 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-
28).
Replace the developer unit (See page 1-5-27).
2MH/2MJ/2MK/2ML
"
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