Kyocera FS-9120DN Service Manual page 93

Code
7400 Developing unit connector insertion
problem
• Absence of the developing unit is de-
tected.
7410 Drum unit connector insertion prob-
lem
• Absence of the drum unit is detected.
7450 Developing unit fuse cut problem
• The developer unit fuse cannot be
cut.
7800 Broken external temperature ther-
mistor wire
• The input voltage is above 4.5 V.
7810 Short-circuited external temperature
thermistor
• The input voltage is below 1.0 V.
8010 Finisher* paper conveying motor
problem
• The paper conveying motor lockup
signal is detected for 0.5 s or longer.
*: Optional
Contents
Causes Check procedures/corrective measures
Developing unit Reinsert the developing unit connector if
connector in- necessary.
serted incorrectly.
Defective devel- Replace the developing unit.
oping unit connec-
tor.
Drum unit connec- Reinsert the drum unit connector if neces-
tor inserted incor- sary.
rectly.
Defective drum Replace the drum unit.
unit connector.
Developing unit Reinsert the developing unit connector if
connector in- necessary.
serted incorrectly.
Defective devel- Replace the developing unit.
oping unit connec-
tor.
Poor contact in Reinsert the connector. Also check for con-
the humidity sen- tinuity within the connector cable. If none,
sor board connec- remedy or replace the cable.
tor terminals.
Defective external Replace the humidity sensor board.
temperature ther-
mistor.
Poor contact in Reinsert the connector. Also check for con-
the humidity sen- tinuity within the connector cable. If none,
sor board connec- remedy or replace the cable.
tor terminals.
Defective external Replace the humidity sensor board.
temperature ther-
mistor.
Poor contact in Reinsert the connector. Also check for con-
the paper convey- tinuity within the connector cable. If none,
ing motor connec- remedy or replace the cable.
tor terminals.
The paper con- Replace the paper conveying motor and
check for correct operation.
veying motor mal-
functions.
Defective finisher Replace the finisher main board and check
main board. for correct operation.
FS-9120DN/9520DN
Remarks
1-5-23