Kyocera KM-3050 Service Manual page 173

Code
C7810 Short-circuited external thermistor
The thermistor input value is 0.5 V or
less.
C7900 Drum EEPROM error
Reading from or writing to EEPROM
cannot be performed.
C7910 Developing unit EEPROM error
Reading from or writing to EEPROM
cannot be performed.
C8020 Punch motor problem (optional 3000-
sheet document finisher)
The LOCK signal of the punch motor is
detected for more than 500 ms while the
punch motor is operating.
C8030 Tray upper limit detection problem
(optional document finisher)
When the tray elevation motor raises a
tray, the ON status of the tray upper limit
sensor is detected.
Contents
Causes Check procedures/corrective measures
Poor contact in the Check the connection of connector YC14 on
connector termi- the engine PWB and the continuity across
nals. the connector terminals. Repair or replace if
necessary.
Defective humidity Replace the humidity sensor.
sensor.
Poor contact in the Check the connection of connector on the
connector termi- engine PWB and the continuity across the
nals. connector terminals. Repair or replace if
necessary.
Defective drum Replace the drum unit.
unit.
Poor contact in the Check the connection of connector on the
connector termi- engine PWB and the continuity across the
nals. connector terminals. Repair or replace if
necessary.
Defective develop- Replace the developing unit.
ing unit.
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.
The tray upper limit Reinsert the connector. Also check for conti-
sensor/push paper nuity within the connector cable. If none,
sensor/surface remedy or replace the cable.
view sensor con-
nector makes poor
contact.
Defective tray Replace the sensor.
upper limit sensor/
push paper sensor/
surface view sen-
sor.
Defective finisher Replace the finisher main PWB and check
main PWB. for correct operation.
2GN/2GP/2GR
Remarks
1-4-33