Gray Background; Dirt On The Top Edge Or Back Of The Paper; Undulated Printing At The Right Edge (Scanning Start Position) - Olivetti d-Copia 163MF Service Manual

(8) Gray background

Copy example
Print density setting.
ABC
123
Defective drum surface potential.
Defective main charger grid.
Developing roller (in the developer
unit).

(9) Dirt on the top edge or back of the paper

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Toner contamination in various parts.
ABC
123
Defective transfer roller.

(10) Undulated printing at the right edge (scanning start position)

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Defective laser scanner unit.
This vertical
Defective engine controller circuit in
line should
the engine/high voltage PWB.
be straight.
1-4-20
Causes
Causes
Causes
Service Manual
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 opera-
tion guide.
Defective drum surface potential. The drum surface potential
should be approximately 470±15 V. This may vary depend-
ing on production lots. Measurement is possible only by
using the jig and tool specifically designed for this purpose.
The drum unit will have to be replaced if it bears values far
out of the allowable range.
Defective main charger grid. Clean the main charger grid.
Defective developing roller (in the developer unit).
If a developer unit which is known to work normally is avail-
able for check, replace the current developer unit with the
normal one. If the symptom disappears, replace the devel-
oper unit with a new one (See P.1-5-6).
Check procedures/corrective measures
Toner contamination in various parts. Dirty edges and back
of the paper can be caused by toner accumulated on such
parts as the paper chute, paper transportation paths, the bot-
tom of the drum and developer, and the fuser unit inlet.
Clean these areas and parts to remove toner.
Defective transfer roller. If the transfer roller is contaminated
with toner, clean the transfer roller using a vacuum cleaner or
by continuously printing a low-density page until the symp-
tom has faded away.
Check procedures/corrective measures
Defective laser scanner unit. Defective polygon motor in the
laser scanner unit. Replace the laser scanner unit
(See P.1-5-17).
Defective engine controller circuit in the engine/high voltage
PWB. Replace the engine/high voltage PWB (See P.1-5-14).
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