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Code
C6020
Abnormally high fuser thermistor
center temperature
Fuser thermistor 2 is detected 230°C/
446°F or more for 40 ms.
C6050
Abnormally low fuser thermistor cen-
ter temperature
Fuser thermistor 1 is detected 100°C/
212°F less then 1 s continuously during
copying.
C6120
Abnormally high fuser thermistor
edge temperature
Fuser thermistor 1 is detected 240°C/
464°F or more for 40 ms.
C6150
Abnormally low fuser thermistor edge
temperature
Fuser thermistor 1 is detected 80°C/
176°F less than 1 s continuously during
copying.
C6400
Zero-cross signal error
While fuser heater ON/OFF control is
performed, the zero-cross signal is not
input within 3 s.
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.
Y112040-6
Contents
Causes
Check procedures/corrective measures
Installation defec-
Check the mounting state of the fuser ther-
tiveness on fuser
mistor 2. If any problem is found, repair it.
thermistor 2.
Defective fuser
Replace the fuser thermistor 2.
thermistor 2.
Defective engine
Replace the engine PWB and check for cor-
PWB.
rect operation.
Defective fuser
Replace the fuser heater 1 or 2.
heater 1 or 2.
Installation defec-
Check the mounting state of the fuser ther-
tiveness on fuser
mistor 2. If any problem is found, repair it.
thermistor 2.
Defective PWB.
Replace the power source PWB or engine
PWB and check for correct operation.
Installation defec-
Check the mounting state of the fuser ther-
tiveness on fuser
mistor 1. If any problem is found, repair it.
thermistor 1.
Defective fuser
Replace the fuser thermistor 1.
thermistor 1.
Defective engine
Replace the engine PWB and check for cor-
PWB.
rect operation.
Defective fuser
Replace the fuser heater 1 or 2.
heater 1 or 2.
Installation defec-
Check the mounting state of the fuser ther-
tiveness on fuser
mistor 1. If any problem is found, repair it.
thermistor 1.
Defective PWB.
Replace the power source PWB or engine
PWB and check for correct operation.
Defective PWB.
Replace the power source PWB or engine
PWB and check for correct operation.
Poor contact in the
Check the connection of connector YC1 on
connector termi-
the engine PWB and the continuity across
nals.
the connector terminals. Repair or replace if
necessary.
Fuser unit connec-
Reinsert the fuser unit connector if neces-
tor inserted incor-
sary.
rectly.
Service Manual
Remarks
2K5
1-4-27
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