Oce 3121, Technical & Service Manual

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