2-31
Confidential
Detected irregular power 
supply for more than 100 
times.
0900 2-36
Detected that supply 
power is unstable. (less 
than 100 times)
6F00 2-44
The center thermistor of the 
fuser unit has not reached 
the specified temperature 
within the specified time 
after it was heated normally 
to the certain level.
0502 2-35
The hardware detected a 
temperature error through the 
center thermistor or the side 
thermistor of the fuser unit.
050A 2-35
Some fuser unit errors 
occurred at power-ON or upon 
recovery from sleep mode.
6901 2-43
After the error was 
detected at the fuser unit, 
power was turned ON 
again and the error is 
being checked. (If power is 
turned OFF and ON after 
error code 6901 occurred, 
this code is displayed for 
about 15 minutes.)
6902 2-43
After the heat unit was 
heated normally, the 
center thermistor of the 
fuser unit detected a 
temperature lower than 
the specified value.
0504 2-35
The center thermistor of 
the fuser unit detected a 
temperature rise greater 
than the specified value 
within the specified time.
0505 2-35
The center thermistor of 
the fuser unit detected a 
temperature fall greater 
than the specified value 
within the specified time.
0506 2-35
LED
Press [Go] 
once
Press [Go] 
twice
Type of problem
Error 
codes
Refer 
to:
Toner
Ready
Paper
Drum
Toner
Ready
Paper
Drum
Toner
Ready
Paper
Drum
Toner
Ready
Paper
Drum
Toner
Ready
Paper
Drum