Oce 3121 Technical & Service Manual page 91

The copy is completely blank
Cause
Locking lever for the
developing unit
Drive for the developing
unit
Developing unit
Transfer unit
High voltage cable for
the transfer
DC control PBA
Power supply PBA
Power supply to the CCD
unit
Laser unit, the image
processor PBA
OPC unit
18 TSM Océ 3121
Step Checks
1 Is the developing unit
locked against the OPC
drum, during copying?
2 Does the developing
roller rotate during copy-
ing?
3 Is toner available?
4 Execute test printing
using (' * 4 * ' ) , '
L-TEST1-7 '. In service
mode. Is the image cor-
rect on the OPC?
5 Is the transfer unit fitted
correctly?
6 Is there a leakage of
charge from the transfer
roller?
7 Is there an open circuit or
poor contact on the trans-
fer HT cable? (The cable
leads from the trans-
former 502 on the power
supply PBA).
8 Replace the DC control
PBA
9 Replace the power supply
PBA
10 Is the voltage correct
from the analogue proc-
essor PBA to the CCD
unit?
11 Remove the developing
unit and make a copy of a
solid black document. Is
a laser beam striking the
OPC?
Y/N Action
No Check the locking of the
developing unit.
No Check the drive of the
developing unit.
No Refer to: The ' ADD
TONER ' message fails
to switch ON.
No Go to step 11.
No Insert it securely
Yes Check the transfer unit
Yes Reconnect the cable, or
fit a new HT cable.
OK End.
?
OK End.
?
No Check the cables be-
I
tween the CCD and the
power supply PBA. If
undamaged, replace the
CCD.
Check the power supply
I
PBA
No Replace the laser unit
I
Replace the image
I
processor PBA
Yes Replace the OPC unit.
Image quality