Toshiba e-studio550 Service Manual page 209

This sensor is for detecting that the trailing edge of the paper has reached the fuser unit exit sensor and
also for detecting of paper jams at the fuser unit exit section.
(9) Fuser roller center thermistor/Fuser roller side thermistor (rear)
This thermistor detects the temperature of the fuser roller to maintain it in a certain range, which is
higher than the lower limit causing the poor fusing and lower than the upper limit causing the high
temperature offset. When the temperature of the fuser roller is lower than the preset temperature, it
turns ON the power supply to the IH coil, and when it is higher than the preset temperature, it cuts OFF
the supply. It also detects the slight different of the temperatures at the center and rear end of the fuser
roller to control ON/OFF of the center and side IH coil to keep the fuser roller at a certain temperature.
(10) Fuser roller side thermistor (front)
This thermistor cannot be used for the temperature control. It detects a temperature abnormality at the
side area of the fuser roller where paper does not pass through.
(11) Thermostats (center, front)
The center and front thermostats cut off the power supply to the IH coil when the fuser roller becomes
abnormally hot as the result of a problem such as the thermistor malfunction. The thermostats of this
copier are used to prevent abnormal operations, and when they detect any abnormality, they must be
replaced altogether with the other damaged parts of the fuser unit.
JUNE 2002 © TOSHIBA TEC 14 - 3 e-STUDIO550/650/810 FUSER UNIT