Kyocera TASKalfa 7002i Service Manual page 1287

C7101: Toner sensor error
The sensor output value is less than 60 or 944 or more for 3s continuously.
Step Check description
1 Checking the toner sensor
2 Reinstalling the developer
unit
3 Checking the connection
4 Replacing the drive gear
5 Replacing the developer
unit
6 Firmware upgrade
7 Replacing the front PWB
8 Replacing the engine PWB The engine PWB is faulty.
C7221: LSU thermistor broken
The input sampling value of the PD PWB (LSU thermistor) exceeds the reference value. (After the error is
detected, the detected temperature is regarded as 23°C / 73°F.)
Step Check description
1 Executing U139
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 drive gears for the
developer unit are dam-
aged. (The spiral cannot
rotate.)
The developer unit (Toner
sensor ) is faulty.
The firmware is not the lat-
est version.
The front PWB is faulty.
Assumed cause
The PD PWB is faulty.
7-427
Measures
Check the output value of the
toner sensor at U155.
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 drive gears for
the developer unit.
Replace the developer unit.
Upgrade the engine firmware
to the latest version
Replace the front PWB.
Replace the engine PWB.
Measures
Execute U139 [LSU] to check
the in-machine temperature
around the LSU. (Go to the
next step.)
2WA/2NJ/2RK
Reference
Executing
U155
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
Reference
Executing
U139