Ricoh K-C3.5L Service Training page 103

Machine checks thermistors once every 1.5 seconds.
Machine compares current and previous readings, and the target, and then
decides how long to keep lamp on during next second.
Slide 103
More on Fusing Temperature Control
The cpu switches the fusing lamp on/off depending on the thermistor output.
The cpu determines how long to keep the lamp on during the next second by
comparing the current and previously detected temperatures with the target
temperature.
Starting and stopping the fusing lamp power every 1.5 seconds may cause
fluorescent lighting in the room to flicker. To reduce this flickering, increase the
value stored in SP 1108.
Fusing Temperature Control
103
Model K-C3.5L