2T6/2T7/2T8/2T9-1
1-4-21
7100 Toner sensor error
Sensor output value of 930 or
more continuously for 5 s.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Toner sensor and drum PWB (YC3)
Drum connect PWB(YC2) and relay-L PWB
(YC3)
Relay-L PWB(YC1) and engine PWB (YC2)
Defective toner
sensor.
Replace the developer unit.
(See Page 1-5-13)
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-22).
7400 Developer unit non-install-
ing error
Sensor output value of 31 or
less continuously for 5 s.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Toner sensor and drum PWB (YC3)
Drum connect PWB(YC2) and relay-L PWB
(YC3)
Relay-L PWB(YC1) and engine PWB (YC2)
Defective toner
sensor.
Replace the developer unit.
(See Page 1-5-13)
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-22).
7410 Drum unit type mismatch
error
The drum PWB EEPROM
does not communicate
normally.
Absence of the drum unit
is detected.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Drum unit and drum connect PWB (YC1)
Drum connect PWB(YC2) and relay-L PWB
(YC3)
Relay-L PWB(YC1) and engine PWB (YC2)
Defective toner
sensor.
Replace the drum unit.
(See Page 1-5-13)
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-22).
Code Contents Causes
Check procedures/
corrective measures
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