Olivetti d-Copia 6500MF Plus Service Manual page 532

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Defective part
Developing unit
1
High-voltage PWB
2
Transfer belt unit
3
Laser scanner unit
(LSU)
4
Engine PWB
5
Service Manual
1. No or defective developing bias output.
2. Failure of the rotation of the developing roller.
3. Defective transfer.
4. Laser is not dispersed from the laser scanner unit (LSU).
5. The drum does not rotate.
Check description
Executing U089 to generate PGs
and check the following:
Check whether the developer
drive gear is damaged.
Check the developing roller is
rotated by hand.
Check contamination and defor-
mation on the terminals of devel-
oper unit or the high-voltage
PWB1.
Check the connection of the con-
nectors and the high-voltage
PWB. Or, verify conduction of
the wires.
Check if developing bias value at
its default by U140.
Check if the right side conveying
unit is closed.
Check the connection of the con-
nectors.
Or, verify conduction of the
wires.
A control signal is not derived
from the engine PWB.
Cause of trouble
If the gear is damaged, replace the developer
unit.
If the developer unit is in fault, replace the
developer unit. (see page 1-5-56)
If the connecting terminals are dirty, clean.
If the connecting terminals are deformed,
correct for a proper conduction.
Reinsert the connector if it its connection is
loose.
Replace the cable if it has no conduction.
High voltage PWB (YC 1) and engine
PWB (YC17): Developer
High voltage PWB (YC 2) and engine
PWB (YC16): Transfer
1. If the value obtains by U140 does not con-
form to the default value, reset it to the
default. (see page 1-3-83)
2. Replace the high-voltage PWB.
If the conveying unit has not been closed,
check how the conveying guide is locked and
open the conveying guide once, then close.
1. Reinsert the FFC wire if it its connection is
loose.
Replace the cable if it has no conduction.
2. Replace the LSU
(see page 1-5-49)
Replace the enging PWB.
(see page 1-5-83)
1-4-204
Corrective Action
2N8/2N7
Y116520-3