The fusing unit has two fusing lamps: the first fusing lamp (center: 650W) [A] heats the center of the fusing
roller, and the second fusing lamp (ends: 550W) [B] heats both ends of the hot roller. This arrangement
ensures even heat on all surfaces of the roller.
In order to control the temperature of the roller, two high response thermistors are attached to the unit, one
near the center [C] and one at the end [D] of the hot roller.
Fusing Temperature Control
There are two types of temperature control: On/off control (Default), and Phase control.
Either mode can be selected with SP1104 (Fusing Temperature Control).
After the machine is powered on, the CPU checks the ac frequency for 500 ms, in case phase control is
selected later for the temperature control, and then switches on the fusing lamp.
As soon as both the center and end thermistors detect the print ready temperature (also known as the “re-
load” temperature) , the machine can operate. The “reload” temperature is 30°C below the fusing
temperature (this depends on SP1105-05, 06). As soon as the thermistors detect the fusing temperature,
the CPU switches the lamps off but frequently switches on/off again in order to maintain the fusing tem-
perature.
Image Fusing and Paper Exit
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