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6) Center thermistor / Side thermistor
This thermistor detects the temperature of the fuser roller to maintain it in a certain temperature
range (actually around 180°C) between the lower limit causing the poor fusing and the upper limit
causing the high temperature offsetting. When the temperature of the fuser roller is lower than the
preset temperature, it turns ON the power supply to the heater lamps, and when it is higher than the
preset temperature, it cuts off the supply.
The center thermistor detects the temperature of the center part of the fuser roller, and the side ther-
mistor detects the temperature of one side of fuser roller and control the both sides.
7) Edge thermistor
It detects the temperature abnormality at the both ends of the fuser roller. This area may be over-
heated without heat absorption by paper since paper does not pass through this area. This ther-
mistor is not related to the temperature control of the fuser roller.
8) Thermostat
The thermostat cuts off the power supply to the heater lamps by opening itself if the fuser roller
becomes abnormally hot as a result of the problem such as thermistor malfunction. The thermostat
for this equipment is used to prevent abnormal operation. When the thermostat detects any abnor-
mality, it must be replaced as well as the other damaged parts in the fuser unit.
e-STUDIO200L/230/280 FUSER UNIT
13 - 4
June 2004 © TOSHIBA TEC
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