Error code Description Action
121.33 The fuser is too cold when the paper is in the fuser. See
“Fuser service check” on page 144.
121.34 The fuser is too cold during steady state control
when paper is not in the fuser.
Note: This event can occur during printing or
standby modes.
121.50 The fuser went over the required temperature
during a global over temperature check.
121.52 The main thermistor temperature is out of range.
121.53 The main thermistor temperature change rate is
out of range.
121.71 Open fuser main heater thermistor.
Fuser service check
Action Yes No
Step 1
Make sure that the voltage rating of the printer matches the power
supply voltage of outlet the printer is plugged into.
Does the problem remain?
Go to step 2. The problem is
solved.
Step 2
a Make sure that the tray insert is properly inserted.
b Make sure that the paper type and size settings match the
paper type and size set on the tray.
c Make sure that the duplex unit is properly inserted.
d Make sure that the paper size setting in the duplex unit matches
the printer setting.
e Make sure that the front and rear doors are fully closed.
f Make sure that the output bin is free from obstructions.
Does the problem remain?
Go to step 3. The problem is
solved.
Step 3
a Remove the imaging unit and toner cartridge, and then make
sure that the paper path is free of jams and obstructions.
b Clear all rollers of dirt and contamination.
Does the problem remain?
Go to step 4. The problem is
solved.
3400-48x
Diagnostics and troubleshooting
144
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