Kyocera KM-C2520 Service Manual page 200

2FZ/2F0/2HC-5
Code
C7420 Transfer belt unit type mismatch
problem
Absence of the transfer belt unit is
detected.
C7800 Broken external thermistor wire
An abnormal value is detected in the
input data to the outer temperature sen-
sor.
C7810 Short-circuited external thermistor
An abnormal value is detected in the
input data to the outer temperature sen-
sor.
C7901 Drum BK EEPROM error
Reading from or writing to EEPROM
cannot be performed.
C7902 Drum C EEPROM error
Reading from or writing to EEPROM
cannot be performed.
C7903 Drum M EEPROM error
Reading from or writing to EEPROM
cannot be performed.
C7904 Drum Y EEPROM error
Reading from or writing to EEPROM
cannot be performed.
C7911 Developing unit BK EEPROM error
Reading from or writing to EEPROM
cannot be performed.
1-4-40
Contents
Causes Check procedures/corrective measures
Transfer belt unit Reinsert the transfer belt unit connector if
connector inserted necessary.
incorrectly.
Different type of Install the correct transfer belt unit.
the transfer belt
unit is installed.
Poor contact in the Check the connection of connector YC13 on
connector termi- the engine PWB and the continuity across
nals. the connector terminals. Repair or replace if
necessary.
Defective engine Replace the engine PWB and check for cor-
PWB. rect operation (see page 1-5-32).
Poor contact in the Check the connection of connector YC13 on
connector termi- the engine PWB and the continuity across
nals. the connector terminals. Repair or replace if
necessary.
Defective engine Replace the engine PWB and check for cor-
PWB. rect operation (see page 1-5-32).
Poor contact in the Check the connection of connector YC18 on
connector termi- the engine PWB and the continuity across
nals. the connector terminals. Repair or replace if
necessary.
Defective drum Replace the drum unit BK (see page 1-5-
PWB BK. 27).
Poor contact in the Check the connection of connector YC17 on
connector termi- the engine PWB and the continuity across
nals. the connector terminals. Repair or replace if
necessary.
Defective drum Replace the drum unit C (see page 1-5-27).
PWB C.
Poor contact in the Check the connection of connector YC17 on
connector termi- the engine PWB and the continuity across
nals. the connector terminals. Repair or replace if
necessary.
Defective drum Replace the drum unit M (see page 1-5-27).
PWB M.
Poor contact in the Check the connection of connector YC18 on
connector termi- the engine PWB and the continuity across
nals. the connector terminals. Repair or replace if
necessary.
Defective drum Replace the drum unit Y (see page 1-5-27).
PWB Y.
Poor contact in the Check the connection of connector YC18 on
connector termi- the engine PWB and the continuity across
nals. the connector terminals. Repair or replace if
necessary.
Defective develop- Replace the developing unit BK (see page
ing PWB BK. 1-5-26).
Remarks