Kyocera TASKalfa 4500i Service Manual page 347

Code Contents
7251 Short-circuited developer
thermistor
The sensor input sampling is
less than 69.
7301 Toner hopper motor error
When the toner hopper motor
is driven, toner hopper sensor
does not turn on within 200
ms. This error is detected 15
times successively.
7401 Developer unit type mis-
match error
Absence of the developer unit
is detected.
7460 Developer shutter error
Power is turned on while the
developer shutter is locked.
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. Developer unit and front PWB (YC7)
Front PWB (YC2) and engine PWB (YC8)
Defective devel- Replace developer unit (see page 1-5-28).
oper thermistor.
Defective engine Replace the engine PWB and check for cor-
PWB. rect operation (see page 1-5-47).
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. Toner hopper motor and front PWB (YC5)
Front PWB (YC3) and engine PWB (YC7)
Defective drive Check if the gears rotate smoothly. If not,
transmission sys- grease the bushes and gears. Check for
tem of motor. broken gears and replace if any.
Defective toner Replace the toner hopper sensor.
hopper sensor.
Defective toner Replace the toner hopper motor.
hopper motor.
Defective engine Replace the engine PWB and check for cor-
PWB. rect operation (see page 1-5-47).
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. Developer unit and front PWB (YC7)
Front PWB (YC2) and engine PWB (YC8)
Different type of Install the correct developer unit.
the developer unit
is installed.
The developer Release the developer shutter (see page 1-
shutter has been 2-12).
locked.
Reinsert the connector. Also check for conti-
Defective connec-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. Developer shutter sensor and front PWB
(YC4)
Front PWB (YC3) and engine PWB (YC7)
1-4-43
2LL/2LJ/2LH-1
Check procedures/
corrective measures