Kyocera ECOSYS FS-4300DN Service Manual page 82

Code Contents
7410 Drum unit type mismatch
error
The drum PWB EEPROM
does not communicate
normally.
Absence of the drum unit
is detected.
7800 Broken external thermistor
wire
The average of thermistor out-
put value of 1016 or more
continuously for 160 ms.
The average of thermistor out-
put value of 930 or more con-
tinuously for 5 s.
7810 Short-circuited external
thermistor wire
The average of thermistor out-
put value of 31 or less contin-
uously for 5 s.
7900 Drum unit EEPROM error
No response is issued from
the device in reading/writing
for 5 ms or more and this
problem is repeated five times
successively.
Mismatch of reading data from
two locations occurs eight
times successively.
Mismatch between writing
data and reading data occurs
eight times successively.
Causes
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. Drum unit and drum connect PWB (YC1)
Drum connect PWB and relay-L PWB (YC3)
Relay-L PWB and engine PWB (YC2)
Defective toner Replace the drum unit.
sensor. (See Page 1-5-13)
Defective engine Replace the engine PWB and check for cor-
PWB. rect operation (see page 1-5-22).
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. Operation PWB and engine PWB (YC17)
Defective tempera- Replace the operation PWB.
ture sensor.
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. Operation PWB and engine PWB (YC17)
Defective tempera- Replace the operation PWB.
ture sensor.
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. Drum unit and drum connect PWB (YC1)
Drum connect PWB and relay-L PWB (YC3)
Relay-L PWB and engine PWB (YC15)
Defective drum Replace the drum unit (see 1-5-15).
unit.
1-4-22
2LV/2L1/2L2/2MS/2MT
Check procedures/
corrective measures