2MN/2N1
1-4-51
5103 Main high-voltage error M
Measure the inflowing current
when Vpp is varied in 3 steps
and verify if the difference of
the currents of 0 and step 2 is
less than 42 (51 if lower high-
voltage board).
Improper installa-
tion charger roller
unit M.
Reinstall the charger roller unit M.
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.
High voltage PWB 1 (YC3) and engine PWB
(YC17)
Defective high volt-
age PWB 1.
Replace the high voltage PWB 1 and check
for correct operation (see page 1-5-54).
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-49).
5104 Main high-voltage error Y
Measure the inflowing current
when Vpp is varied in 3 steps
and verify if the difference of
the currents of 0 and step 2 is
less than 42 (51 if lower high-
voltage board).
Improper installa-
tion charger roller
unit Y.
Reinstall the charger roller unit Y.
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.
High voltage PWB 1 (YC1) and engine PWB
(YC16)
Defective high volt-
age PWB 1.
Replace the high voltage PWB 1 and check
for correct operation (see page 1-5-54).
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-49).
6000 Broken fuser heater wire
Fuser thermistor 1 does not
reach 100° C/212 °F even
after 60 s during warming up.
The detected temperature of
fuser thermistor 1 does not
reach the specified tempera-
ture (ready indication temper-
ature) for 420 s in warming up
after reached to 100° C/212
°F.
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 fuser IH PWB
(YC1)
Fuser IH PWB (YC4) and engine PWB
(YC26)
Fuser thermostat
triggered.
Replace the fuser unit (see page 1-5-40).
Defective fuser IH. Replace the fuser unit (see page 1-5-40).
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-49).
6020 Abnormally high fuser
thermistor 1 temperature
Fuser thermistor 1 detects a
temperature higher than
240°C/464°F for 1 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.
Fuser unit and engine PWB (YC26)
Shorted fuser
thermistor 1.
Replace the fuser unit (see page 1-5-40).
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-49).
Code Contents Causes
Check procedures/
corrective measures
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