Olivetti d-Copia 284MF, Service Manual

Page: 133 / 251

2JN
1-4-15
(6) Black vertical streaks.
(7) Unsharpness.
(8) Gray background.
Print example Causes Check procedures/corrective measures
Adhesion of oxide to main charger
wire. Remove the drum unit (See page 1-5-30). 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.
Defective drum unit. 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 1-5-30).
Defective developing roller (develop-
ing unit). Replace the developing unit (See page 1-5-29).
Print example Causes Check procedures/corrective measures
Defective paper specifications. Replace paper with the one that satisfies the paper specifica-
tion.
Defective transfer roller installation. 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 1-5-32).
Defective transfer bias output. Replace the high voltage PWB or control PWB (See page 1-5-
45 or 1-5-39).
EcoPrint mode setting. 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.
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 sur-
face. Replace the drum unit (See page 1-5-30).
Defective main charger grid. Clean the main charger grid (See page 1-5-31).
Defective developing roller (develop-
ing unit). If a developing unit which is known to work normally is avail-
able for check, replace the current developing unit in the
machine with the normal one. If the symptom disappears,
replace the developing unit with a new one (See page 1-5-29).
ABC
123
ABC
123
Y111030-4 Service Manual