Kyocera 300ci Service Manual page 268

2JZ/2JX/2JV/2H7-5
Code
C7912 Developing unit C 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.
C7913 Developing unit M 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.
C7914 Developing unit Y 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.
C7950 High voltage control PWB error
A communication error from high voltage
control PWB is detected 10 times in suc-
cession.
C8020 Punch motor problem (optional 3000-
sheet document finisher)
The error signal of the punch motor is
detected for more than 500 ms while the
punch motor is operating.
1-4-50
Contents
Causes Check procedures/corrective measures
Poor contact in the Check the connection of connector YC6 on
connector termi- the sub front PWB and the continuity across
nals. the connector terminals. Repair or replace if
necessary.
Defective develop- Replace the developing unit C (see page 1-
ing PWB C. 5-34).
Poor contact in the Check the connection of connector YC8 on
connector termi- the sub front PWB and the continuity across
nals. the connector terminals. Repair or replace if
necessary.
Defective develop- Replace the developing unit M (see page 1-
ing PWB M. 5-34).
Poor contact in the Check the connection of connector YC4 on
connector termi- the sub front PWB and the continuity across
nals. the connector terminals. Repair or replace if
necessary.
Defective develop- Replace the developing unit Y (see page 1-
ing PWB Y. 5-34).
Poor contact in the Check the connection of connector YC30 on
connector termi- the engine PWB and the connector on the
nals. high voltage control PWB, and the continuity
across the connector terminals. Repair or
replace if necessary.
Defective PWB. Replace the high voltage control PWB or
engine PWB and check for correct opera-
tion.
Poor contact in the Check the connection of connector on the
connector termi- punch PWB and the continuity across the
nals. connector terminals. Repair or replace if
necessary.
Defective punch Replace the punch motor.
motor.
Defective PWB. Replace the punch PWB or finisher main
PWB and check for correct operation.
Remarks