Oce 3121, Technical & Service Manual

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ed.1 Image quality 7
The copy is too light. (including solid black)
Cause Step Checks Y/N Action
1 Carry out the image
adjustment procedure. Is
the problem corrected? Yes End.
The image will be much
lighter if the pattern print
is placed in reverse
(left/right) orientation.
Ensure correct orienta-
tion of the test chart.
2 Switch OFF in the mid-
dle of the copying cycle.
Open the front door. Is
there a fairly normal
toner image on the OPC ? No
■
Go to step 9
Transfer unit
(Transfer fault) 3 Is the transfer unit prop-
erly installed? No Correctly fit the transfer
unit.
4 Is there a leakage of
charge from the transfer
roller? Yes Check the transfer unit.
5 Is there dirt, cracks or
scratches on the transfer
roller? Yes Replace the transfer
charging roller.
6 Check the spring for the
transfer roller:- undam-
aged,- correct tension. No Correct the position of
the spring, or replace the
spring.
Paper
(Transfer fault) 7 Using an alternative copy
paper, is the image
darker? Yes
■
The paper may be
moist. Advise the user
regarding the correct
method of storing pa-
per.
■
Advise the user that the
use of non-recommend-
ed paper may reduce
the quality.
Transfer guide
(Transfer fault) 8 Position the feeding unit
in the operating position.
Measure the resistance
between the transfer
guide and the support of
the rail for the transfer
unit. Is the resistance 0
ohm? Yes Check the mechanical
connection of the metal
components (e.g. the side
plate of the feeding unit).
High-voltage cable, high
voltage transformer, DC
control PBA
(Transfer fault) No
■
Check the high-voltage
cable for electrical con-
tinuity.
■
Check the high voltage
transformer, and the
DC control PBA