Kyocera 300ci Service Manual page 267

Code
C7800 Broken external thermistor wire
An abnormal value is detected in the
input data to the outer temperature sen-
sor.
C7901 Drum K EEPROM error
No response is issued from the device in
reading/writing for 5 ms or more and this
problem is repeated five times succes-
sively.
Mismatch of reading data from two loca-
tions occurs eight times successively.
Mismatch between writing data and
reading data occurs eight times succes-
sively.
C7902 Drum C EEPROM error
No response is issued from the device in
reading/writing for 5 ms or more and this
problem is repeated five times succes-
sively.
Mismatch of reading data from two loca-
tions occurs eight times successively.
Mismatch between writing data and
reading data occurs eight times succes-
sively.
C7903 Drum M EEPROM error
No response is issued from the device in
reading/writing for 5 ms or more and this
problem is repeated five times succes-
sively.
Mismatch of reading data from two loca-
tions occurs eight times successively.
Mismatch between writing data and
reading data occurs eight times succes-
sively.
C7904 Drum Y EEPROM error
No response is issued from the device in
reading/writing for 5 ms or more and this
problem is repeated five times succes-
sively.
Mismatch of reading data from two loca-
tions occurs eight times successively.
Mismatch between writing data and
reading data occurs eight times succes-
sively.
C7911 Developing unit K EEPROM error
No response is issued from the device in
reading/writing for 7.5 ms or more and
this problem is repeated five times suc-
cessively.
Mismatch of reading data from two loca-
tions occurs eight times successively.
Mismatch between writing data and
reading data occurs eight times succes-
sively.
Contents
Causes Check procedures/corrective measures
Poor contact in the Check the connection of connector YC1 on
connector termi- the main front PWB and the continuity
nals. across the connector terminals. Repair or
replace if necessary.
Defective PWB. Replace the main front PWB or engine PWB
and check for correct operation.
Poor contact in the Check the connection of connector YC3 on
connector termi- the main front PWB and the continuity
nals. across the connector terminals. Repair or
replace if necessary.
Defective drum Replace the drum unit K (see page 1-5-35).
PWB K.
Poor contact in the Check the connection of connector YC5 on
connector termi- the sub front PWB and the continuity across
nals. the connector terminals. Repair or replace if
necessary.
Defective drum Replace the drum unit C (see page 1-5-35).
PWB C.
Poor contact in the Check the connection of connector YC7 on
connector termi- the sub front PWB and the continuity across
nals. the connector terminals. Repair or replace if
necessary.
Defective drum Replace the drum unit M (see page 1-5-35).
PWB M.
Poor contact in the Check the connection of connector YC3 on
connector termi- the sub front PWB and the continuity across
nals. the connector terminals. Repair or replace if
necessary.
Defective drum Replace the drum unit Y (see page 1-5-35).
PWB Y.
Poor contact in the Check the connection of connector YC4 on
connector termi- the main front PWB and the continuity
nals. across the connector terminals. Repair or
replace if necessary.
Defective develop- Replace the developing unit K (see page 1-
ing PWB K. 5-34).
2JZ/2JX/2JV/2H7-5
Remarks
1-4-49