Service code 546

SC 546 Heating roller
fusing lamp
temperature
fluctuation
The heating roller temperature
changes by ±20°C or more in
one second. This occurs three
times in one minute or two
consecutive times.
• Loose connection of
the thermistor
• Loose connection
between the fusing
unit and main frame
1. Check if the fusing unit is properly set
and connected to the main frame.
2. Check if the heating roller thermistor
connector is firmly connected.
3. Replace the fusing unit