Fusing Temperature Control - Minolta EP1080 Service Manual

21-1. Fusing Temperature Control

The Upper Fusing Roller is heated by Fusing Heater Lamp H1 which is an
AC halogen lamp. Fusing Thermistor TH1 installed on the Upper Fusing
Roller helps keep the optimum fusing temperature.
The fusing temperature is normally controlled at 180°C. To ensure good
fusing performance, however, even when the Lower Fusing Roller remains
cool immediately after warm-up in the early morning, the temperature is
controlled as follows if the fusing temperature is below 100°C when the
copier is turned ON:
200°C control within 5 minutes after the copier has completed warming up.
*
180°C control after the 5-minute period following the completion of the
*
warm-up.
NOTE: If a copy cycle is run within 5 minutes, 200°C control is provided only
for the 1-minute period after the copy cycle has been completed.
TH1 is positioned at a point 90 mm from the paper path reference position,
thereby preventing offset caused by low temperature and degraded fusing
performance for small-size paper.
The control temperature in the Energy Saving Mode is 150°C.
Fusing Thermal Fuse TF1 installed above the Upper Fusing Roller blows to
cut off the power to the Fusing Unit if the temperature of the Upper Fusing
Roller becomes excessively high. It eliminates the possibility of a fire that
could occur when H1 remains ON due to a faulty temperature control circuit.
Warm-up time = Within 1 minute
200
180
150
5 minutes
Warm-up Completed
Energy Saving Mode ON
M-72