Kyocera TASKalfa 7002i Service Manual page 1298

Step Check description
4 Replacing the dum unit
5 Firmware upgrade
6 Replacing the front PWB
7 Replacing the engine PWB The engine PWB is faulty.
C7911: Developer unit EEPROM error
The toner sensor (EEPROM) in the developing unit cannot be accessed. 1. No response from the device is
detected for 5s or more 5 times continuously at read/write. 2. Data written in 2 points do not match 8 times
continuously. 3. Write data and read data does not match 8 times continuously.
Step Check description
1 Resetting the main power
2 Reinstalling the developer
unit
3 Checking the connection
4 Replacing the developer
unit
5 Firmware upgrade
6 Replacing the front PWB
Assumed cause
The EEPROM in the drum
unit is faulty.
The firmware is not the lat-
est version.
The front PWB is faulty.
Assumed cause
The data in the toner sen-
sor (EEPROM) of the
developer unit is faulty.
The developer unit is not
properly installed.
The connector is not prop-
erly connected. Or, the
wire is faulty.
The toner sensor
(EEPROM) of the devel-
oper unit is faulty.
The firmware is not the lat-
est version.
The front PWB is faulty.
7-438
Measures
Replace the drum unit.
Upgrade the engine firmware
to the latest version
Replace the front PWB.
Replace the engine PWB.
Measures
Turn the power switch and
the main power switch off .
After 5s passes, turn the
main power switch and the
power switch on.
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. • Developer unit -
Front PWB • Front PWB -
Engine PWB
Replace the developer unit.
Upgrade the engine firmware
to the latest version
Replace the front PWB.
2WA/2NJ/2RK
Reference
Detaching
and reat-
taching the
drum unit
Firmware
Update
Detaching
and reat-
taching the
engine
PWB
Reference
Detaching
and reat-
taching the
drum unit
Wiring dia-
gram
Detaching
and reat-
taching the
developer
unit
Firmware
Update