Dropouts; Black Dots; Black Horizontal Streaks - Olivetti d-Copia 163MF Service Manual

(3) Dropouts

Copy example
Defective developing roller (in the
developer unit).
ABC
123
Defective drum unit.
Defective fuser unit.
Defective paper specifications.
Defective transfer roller installation.
Defective engine/high voltage PWB
(transfer bias potential).

(4) Black dots

Copy example
Defective drum unit.
ABC
123

(5) Black horizontal streaks

Copy example
Defective drum unit's ground.
ABC
123
Defective drum unit.
1-4-18
Causes
Causes
Causes
Service Manual
Check procedures/corrective measures
If the defects occur at regular intervals of 47.2 mm/1
problem may be the damaged developing roller (in the devel-
oper unit). Replace the developer unit (See P.1-5-6).
Defective drum unit. If the defects occur at regular intervals
of 94 mm/3 ", the problem may be the damaged drum
11/16
(in the drum unit). Replace the drum unit (See P.1-5-6).
Defective fuser unit. If the defects occur at regular intervals
of 63 mm/2 " (heat roller or press roller), the problem may
1/2
be the damaged fuser unit. Replace the press roller or heat
roller (See P.1-5-10).
Defective paper specifications. Paper with rugged surface or
dump tends to cause dropouts. 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 P.1-5-5).
Check the transfer bias output 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).
Check procedures/corrective measures
Defective drum unit. If the defects occur at regular intervals
of 94 mm/3 ", the problem may be the damaged drum
11/16
(in the drum unit). Replace drum unit (See P.1-5-6).
If the defects occur at random intervals, the toner may be
leaking from the developer unit and drum unit. Replace
developer unit and drum unit (See P.1-5-6).
Check procedures/corrective measures
Defective drum unit's ground. The drum axle in the drum unit
and its counter part, the grounding tab in the machine, must
be in a good contact. If necessary, apply a small amount of
electro-conductive grease onto the tab.
Defective drum unit. Replace the drum unit (See P.1-5-6).
", the
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