2P7/2R0/3PN
1-4-18
6120 Abnormally high fuser
thermistor 1 temperature
The detection temperature of
fuser thermistor 1 is higher
than 245°C/473°F.
In a heater-off state, the
detection temperature of fuser
thermistor 1 is higher than
195°C/383°F after the detec-
tion temperature of fuser
thermistor 1 was 155°C/311°F
or less.
Deformed connec-
tor pin.
See page 1-4-17.
Defective triac. See page 1-4-17.
Shorted fuser
thermistor.
Replace the fuser unit (see page 1-5-27).
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-40).
6130 Broken fuser thermistor 1
wire
A/D value of the fuser thermis-
tor 1 exceeds 1019 bit contin-
uously for 4 s during warming
up.
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.
Fuser thermistor and fuser thermistor con-
nect PWB
Fuser thermistor connect PWB and engine
PWB (YC21)
Deformed connec-
tor pin.
See page 1-4-17.
Defective triac. See page 1-4-17.
Defective fuser
thermistor.
Replace the fuser unit (see page 1-5-27).
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-40).
6400 Zero-cross signal error
While fuser heater control is
performed, the zero-cross sig-
nal is not input within 2 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.
Power source PWB (YC3) and engine PWB
(YC1)
Defective power
source PWB or
engine PWB.
Replace the power source PWB or the
engine PWB and check for correct operation
(see page 1-5-48, 1-5-40).
Code Contents Causes
Check procedures/
corrective measures
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