Kyocera KM-2550, Service Manual

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2FT-1
1-5-24
C6420 Fixing fuse cut problem
When you try to cut the fixing fuse, the
fixing is not cut even after 3 s elapse.
Poor contact in the
connector termi-
nals. Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Fixing unit connec-
tor inserted incor-
rectly. Reinsert the fixing unit connector if neces-
sary.
C7400 Developing unit connector insertion
problem
Absence of the developing unit is
detected.
Developing unit
connector inserted
incorrectly. Reinsert the developing unit connector if
necessary.
Defective develop-
ing unit connector. Replace the developing unit.
C7410 Drum unit connector insertion prob-
lem
Absence of the drum unit is detected.
Drum unit connec-
tor inserted incor-
rectly. Reinsert the drum unit connector if neces-
sary.
Defective drum unit
connector. Replace the drum unit.
C7800 Broken external temperature ther-
mistor
The input voltage is 0.5 V or less.
Poor contact in the
humidity sensor
connector termi-
nals. Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective humidity
sensor. Replace the drawer PCB and check for cor-
rect operation.
C7810 Short-circuited external temperature
thermistor
The input voltage is 4.5 V or more.
Poor contact in the
humidity sensor
connector termi-
nals. Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective humidity
sensor. Replace the drawer PCB and check for cor-
rect operation.
C8170 Finisher* front side registration motor
problem
If the front side registration home posi-
tion sensor is on in initialization, the sen-
sor does not turn off within 570 ms of
starting initialization.
If the front side registration home posi-
tion sensor is off in initialization, the sen-
sor does not turn on within 3180 ms of
starting initialization.
The front side reg-
istration motor con-
nector makes poor
contact. Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
The front side reg-
istration motor mal-
functions. Replace the front side registration motor and
check for correct operation.
The front side reg-
istration home
position sensor
connector makes
poor contact. Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
The front side reg-
istration home
position sensor
malfunctions. Replace the front side registration home
position sensor and check for correct opera-
tion.
Defective finisher
main PCB. Replace the finisher main PCB and check
for correct operation.
*: Optional.
Code Contents
Remarks
Causes Check procedures/corrective measures