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November 2003 © TOSHIBA TEC 16 - 3 e-STUDIO3511/4511 FUSER UNIT/PAPER EXIT SECTION
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(8) Cleaning roller / Oil roller
Silicone oil is contained inside of the oil roller to supply a proper amount of oil to the fuser belt, and
this enables to remove the residual toner and paper dust (preventing offsetting phenomenon). Also,
the cleaning roller is a fluorinated aluminum roller which removes the residual toner and paper dust
adhered on the oil roller.
(9) Main thermistor/Sub thermistor
This thermistor detects the temperature of the fuser belt 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 belt 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. The main thermistor detects the temperature of the center part of
the fuser belt and the sub thermistor detects the temperature of the both ends of the fuser belt. It
also detects the slight difference of the temperatures at the center and both ends of the fuser belt to
control the balance of ON/OFF of the center/side parts of IH coil to keep the fuser belt at a certain
temperature.
(10) Front edge thermistor
It detects the temperature abnormality at the both ends of the fuser belt. 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 belt.
(11) Thermostat
The thermostat cuts off the power supply to the IH coil by opening itself if the fuser belt 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 abnormality, it
must be replaced as well as the other damaged parts in the fuser unit.
(12) Exit sensor
This sensor detects the arrival of the leading or trailing edge of the paper at the exit roller of the
fuser unit. It also detects paper jams in the fuser unit paper exit section and trailing edge of paper
turned over for duplex printing.
(13) Exit motor
The exit motor is a stepping motor which drives the exit roller and bridge unit (option). It reduces the
transport speed down to the range from 1/2 to 1/4 according to the type of paper such as OHP film
or thick paper in color modes.
(14) Exit roller
This roller transports the paper from the fusing section to the receiving tray, paper exiting options or
the ADU and is driven by the exit motor.