Oce 3121 Technical & Service Manual page 87

The back of the copy is soiled
Cause
Bias for the transfer
guide
Developing unit and the
registration roller
OPC cleaning unit
Fusing unit
Transfer roller
14 TSM Océ 3121
Step Checks
1 Switch OFF, while copy
paper is passing through
the feeding unit. Is the
back of the copy paper
soiled at this time?
2 Is the voltage between
the transfer guide and the
side plate of the machine
-600V or more? (connect
+ to the transfer guide).
3 Is the problem repeated
at intervals of approxi-
mately 50 mm?
4 Is the problem repeated
at intervals of approxi-
mately 50 mm?
5 Is there soiling of the
lower roller in the fusing
unit?
6 Execute cleaning of the
roller, in user mode.
7 Make several black cop-
ies
8 Is there excessive soiling
of the transfer roller?
Y/N Action
No Go to step 0.
No Check the bias for the
I
transfer unit.
Clean the transfer
I
guide.
Yes Clean the registration
I
roller.
Clean the transfer
I
guide.
Check the developing
I
unit for leakage of ton-
er.
No Clean the feeding unit
I
Check the waste con-
I
tainer unit for leakage
of toner.
Yes Clean the lower roller
I
in the fusing unit?
Clean the entry guide
I
for the fusing unit.
Yes Replace the transfer unit.
Image quality