Oce 3121 Technical & Service Manual page 84

The copy has vertical lines of background
The copy has black lines. (vertical, thick, fuzzy)
Cause Step Checks
Charging roller 1
Scanner (dirty) 2
Developing unit 3
OPC 4
Light (intrusion)
The copy has black lines. (vertical, thick, fuzzy)
Cause Step Checks
Laser exposure 1
system
Charging roller 2
OPC 3
Fusing unit 4
ed.1
Clean the charging roller in user
mode. Is the problem solved?
Clean the mirror, the lens and the
exposure aperture. Is the prob-
lem solved?
Is there an even coating of toner
on the developing roller?
Are there scratches on the OPC,
in the peripheral direction.
Make a test copy, using (' * 4 * '
), ' L-TEST2 ' in service mode.
Does the copy have black lines?
Clean the charging roller in user
mode. Is the problem solved?
Are there scratches on the OPC,
in the peripheral direction.
Try wiping the black lines (if
I
visible) from the OPC, using a
cloth coated with toner. Check
whether the copies no longer
have black lines.
Are there any scratches or black
lines on the surface of the fixing
film? In peripheral direction?
Y/N Action
Yes End.
Yes End.
No Check the edge of the
I
doctor blade.
Wipe the surface of the
I
developing roller, until
it is dry.
Yes Replace the OPC unit.
No Check whether the OPC
is being subjected to
exposure from an out-
side source.
Y/N Action
No The scanner system may
be faulty.
Clean the mirrors 1 to 3.
Yes End.
Yes Replace the OPC unit.
If there are scratches,
I
check to find the cause.
Yes Replace the fuser unit.
No Check that there is no dirt
in the entry of the fuser
unit.
Image quality 11