2JB/2JC
1-4-27
C6020 Abnormally high fuser thermistor
center temperature
Fuser thermistor 2 is detected 230°C/
446°F or more for 40 ms.
Installation defec-
tiveness on fuser
thermistor 2.
Check the mounting state of the fuser ther-
mistor 2. If any problem is found, repair it.
Defective fuser
thermistor 2.
Replace the fuser thermistor 2.
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation.
C6050 Abnormally low fuser thermistor cen-
ter temperature
Fuser thermistor 2 is detected 100°C/
212°F less than 1 s continuously during
copying.
Defective fuser
heater M or S.
Replace the fuser heater M or S.
Installation defec-
tiveness on fuser
thermistor 2.
Check the mounting state of the fuser ther-
mistor 2. If any problem is found, repair it.
Defective PWB. Replace the power source PWB or engine
PWB and check for correct operation.
C6120 Abnormally high fuser thermistor
edge temperature
Fuser thermistor 1 is detected 230°C/
446°F or more for 40 ms.
Installation defec-
tiveness on fuser
thermistor 1.
Check the mounting state of the fuser ther-
mistor 1. If any problem is found, repair it.
Defective fuser
thermistor 1.
Replace the fuser thermistor 1.
Defective engine
PWB.
Replace the engine PWB and check for cor-
rect operation.
C6150 Abnormally low fuser thermistor edge
temperature
Fuser thermistor 1 is detected 100°C/
212°F less than 1 s continuously during
copying.
Defective fuser
heater M or S.
Replace the fuser heater M or S.
Installation defec-
tiveness on fuser
thermistor 1.
Check the mounting state of the fuser ther-
mistor 1. If any problem is found, repair it.
Defective PWB. Replace the power source PWB or engine
PWB and check for correct operation.
C6400 Zero-cross signal error
While fuser heater ON/OFF control is
performed, the zero-cross signal is not
input within 3 s.
Defective PWB. Replace the engine PWB or power source
PWB and check for correct operation.
C6420 Fuser unit fuse cut problem
The fuse cannot be cut, When replacing
the fuser unit, the fuse cannot be cut in
3 s after the fuse cut signal is turned on.
Poor contact in the
connector termi-
nals.
Check the connection of connector YC1 on
the engine PWB and the continuity across
the connector terminals. Repair or replace if
necessary.
Fuser unit connec-
tor inserted incor-
rectly.
Reinsert the fuser unit connector if neces-
sary.
Code Contents
Remarks
C
auses Check procedures/corrective measures
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