Oce 3121, Technical & Service Manual

Page: 86 / 908

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ed.1 Image quality 13
The copy has white spots (horizontal).
Cause Step Checks Y/N Action
Developing unit 1 Execute ( ‘ * 4 * ‘ ) , ‘
L-TEET1 ‘ in service
mode. Are there white
lines in the resulting
image? Yes Go to step 4.
Developing unit 2 Is the problem repeated
at intervals of approxi-
mately 35 mm? Yes
■
Clean the developing
roller.
■
Wipe the surface of the
developing roller, until
it is dry.
■
If scratches are found
on the developing cyl-
inder, replace the devel-
oping unit.
OPC unit 3 Is the problem repeated
at intervals of approxi-
mately 94 mm? Yes
■
Clean the OPC.
■
If there are scratches,
replace the OPC unit.
Paper 4 Using an alternative copy
paper, is the image
darker? Yes The paper may be moist.
Advise the user regarding
the correct method of
storing paper.
Transfer unit 5 Are there white spots on
the photosensitive drum
during copying? No Check the transfer unit
assembly for leakage.
Developing bias 6 Are there white spots on
the photosensitive drum
during copying? Yes Check the developing
bias.
The scanning rail, and
the scanner cable 7 Is the problem repeated
at the same location on
every copy? Yes
■
Check the scanner rail
for foreign matter.
■
Adjust the tension of
the scanner cable.