Black Vertical Streaks; Unsharpness - Olivetti d-Copia 163MF Service Manual

(6) Black vertical streaks

Copy example
Contaminated main charger wire.
ABC
123
Defective drum surface.
Defective magnet roller (in the devel-
oper unit).

(7) Unsharpness

Copy example
Defective paper specifications.
Defective transfer roller installation.
Defective transfer bias potential.
EcoPrint mode setting.
Y107330-8
Causes
Causes
Service Manual
Check procedures/corrective measures
Contaminated main charger wire. Clean the main charger
wire by sliding the green colored cleaning knob in and out
several times.
Defective drum surface. 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 P.1-5-6).
Defective magnet roller (in the developer unit). Replace the
developer unit (See P.1-5-6).
Check procedures/corrective measures
Defective paper specifications. Paper with rugged surface or
dump tends to cause unsharp printing.
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 neces-
sary (See P.1-5-5).
Defective transfer bias potential. Check the transfer bias out-
put on the engine/high voltage PWB. This requires removal
of the left cover and the test equipment. Replace the engine/
high voltage PWB if high voltage potential is not available on
the PWB (See P.1-5-14).
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.
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