Table of Contents
Advertisement
2K5
Code
C7000
Toner motor problem
A motor over-current signal is detected
continuously for 1 s or longer.
C7200
Broken inner thermistor wire
An abnormal value is detected in the
input data to inner thermistor.
C7300
Toner hopper problem
Toner emptiness is detected for 300 s,
three times during the toner replenish-
ment.
C7400
Developing unit connector insertion
problem
Absence of the developing unit is
detected.
C7410
Drum unit connector insertion prob-
lem
Absence of the drum unit is detected.
C7800
Broken external thermistor wire
The thermistor output value is 4.5 V or
more.
C7900
Drum EEPROM error
Reading from or writing to EEPROM
cannot be performed.
1-4-28
Contents
Causes
Check procedures/corrective measures
Poor contact in the
Check the connection of connector YC1 on
connector termi-
the engine PWB and the connector on the
nals.
toner feed motor, and the continuity across
the connector terminals. Repair or replace if
necessary.
Broken the gear.
Check visually and replace the gear if nec-
essary.
Defective toner
Run maintenance item U135 and check if
feed motor.
the toner feed motor operates. If not, replace
the toner feed motor.
Defective engine
Replace the engine PWB and check for cor-
PWB.
rect operation.
Poor contact in the
Check the connection of connector YC32 on
connector termi-
the engine PWB and the continuity across
nals.
the connector terminals. Repair or replace if
necessary.
Defective tempera-
Replace the temperature sensor.
ture sensor.
Poor contact in the
Check the connection of connector YC1 on
connector termi-
the engine PWB and the continuity across
nals.
the connector terminals. Repair or replace if
necessary.
Defective toner
Replace the developing unit.
sensor.
Developing unit
Reinsert the developing unit connector if
connector inserted
necessary.
incorrectly.
Defective develop-
Replace the developing unit.
ing unit connector.
Drum unit connec-
Reinsert the drum unit connector if neces-
tor inserted incor-
sary.
rectly.
Defective drum unit
Replace the drum unit.
connector.
Poor contact in the
Check the connection of connector YC10 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.
Service Manual
Remarks
Y112040-6
Advertisement
Table of Contents
