Kyocera TASKalfa 7002i Service Manual page 1290

C7241: Developer thermistor broken
The input sampling value of the toner sensor (developer thermistor) exceeds the reference value. (After the
abnormal state is detected, the detection temperature is regarded as 23°C / 73°F.)
Step Check description
1 Executing U139
2 Reinstalling the developer
unit
3 Checking the connection
4 Replacing the developer
unit
5 Firmware upgrade
6 Replacing the front PWB
7 Replacing the engine PWB The engine PWB is faulty.
Assumed cause
The toner sensor is faulty.
The developer unit is not
properly installed.
The connector is not prop-
erly connected. Or, the
wire is faulty.
The developer unit (Toner
sensor ) is faulty.
The firmware is not the lat-
est version.
The front PWB is faulty.
7-430
Measures
Execute U139 [Developing]
to check the in-machine tem-
perature around the devel-
oper unit. (Go to the next
step.)
Reinstall the developer unit
so that the connector is firmly
connected.
Clean the terminal of the fol-
lowing wire connectors and
reconnect the connectors. If
there is no continuity, replace
the wire. • Front PWB -
Engine PWB
Replace the developer unit.
Upgrade the engine firmware
to the latest version
Replace the front PWB.
Replace the engine PWB.
2WA/2NJ/2RK
Reference
Detaching
and reat-
taching the
developer
unit
Wiring dia-
gram
Detaching
and reat-
taching the
developer
unit
Firmware
Update
Detaching
and reat-
taching the
engine
PWB