2KZ/2K0
1-4-26
6250 Abnormally low fuser
thermistor 1 (edge) temper-
ature
The fuser temperature lower
than 100 °C/212 °F is
detected continuously for 1 s
during printing.
The fuser temperature lower
than 50 °C/122 °F is detected
continuously for 1 s during
pre-heating.
Deformed connec-
tor pin.
If the I/F connector pins of the fuser unit and
the main unit are deformed owing to foreign
matters, such as paper dusts, replace the
connectors or the units including the con-
nectors.
Defective IH PWB. Replace the IH PWB and check for correct
operation (see page 1-5-35).
Defective fuser
thermistor.
Replace the fuser unit (see page 1-5-18).
Defective fuser
heater.
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-31).
6410
Fuser unit type mismatch
problem
Absence of the fuser unit is
detected.
Fuser unit connec-
tor inserted incor-
rectly.
Reinsert the fuser unit connector if neces-
sary.
Different type of
the fuser unit is
installed.
Install the correct fuser unit.
6600 Belt rotation error
The belt was detected to stop
for 1 s continuously during
motor remote is on.
Defective fuser
motor.
Replace the fuser motor.
Defective IH belt. Replace the fuser unit (see page 1-5-18).
Defective IH PWB. Replace the IH PWB and check for correct
operation (see page 1-5-35).
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation (see page 1-5-31).
6710 CPU thermal runaway
(IHPWB)
Defective IH PWB. Replace the IH PWB and check for correct
operation (see page 1-5-35).
6720 Belt rotation error (IHPWB) Defective IH PWB. Replace the IH PWB and check for correct
operation (see page 1-5-35).
Defective fuser
motor.
Replace the fuser motor.
Defective fuser
unit.
Replace the fuser unit.
6730 Abnormally high IGBT1
temperature (IHPWB)
Defective IH PWB. Replace the IH PWB and check for correct
operation (see page 1-5-35).
Defective cooling
fan motor.
Replace the IH fan motor.
Code Contents Causes
Check procedures/
corrective measures
Service Manual Y113010-4
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