Kyocera TASKalfa 7002i Service Manual page 925

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Step Check description
1 Checking the developer
bias contact
2 Checking the developer
unit
3 Checking the wire
4 Executing U140
5 Checking the developer
motor
6 Replacing the high-volt-
age PWB
7 Checking the FFC
8 Checking the LSU
9 Checking the engine PWB
Assumed cause
The developer bias contact
is dirty or deformed.
The developer drive gear
is faulty.
The connector is not prop-
erly connected.
The setting value of the
developer bias is improper.
The developer motor does
not properly rotate, or the
drive components such as
the drive gears and the
couplings are faulty.
The high-voltage PWB is
faulty.
The FFC is not properly
connected, or it is faulty.
The APC PWB in the LSU
is faulty.
The connectors or the
FFCs on the engine PWB
are not properly con-
nected. Or the wires, FFCs
or the engine PWB are
faulty.
7-65
Measures
Clean the developer bias
contact, or correct its shape
so that it grounds securely.
Replace the developer unit.
Reconnect the wires on the
main high-voltage PWB.
Execute U140 and reset the
developer bias to the default
value.
Reattach the developer motor
and reconnect the wire.
Then, replace the developer
motor if it is not fixed.
Replace the high-voltage
PWB.
Reconnect the FFC to the
LSU. If the FFC is broken,
replace it.
Replace the LSU.
Reconnect the connectors on
the engine PWB. Then, fix or
replace the wires if they are
pinched by the other part or if
they have any damage.
When the issue is not
resolved after that, replace
the engine PWB.
2WA/2NJ/2RK
Reference
Detaching
and Reat-
taching the
developer
unit
Wiring dia-
gram
Executing
U140
Detaching
and Reat-
taching the
high-volt-
age PWB
Detaching
and Reat-
taching the
LSU
Detaching
and Reat-
taching the
engine
PWB