Toshiba e-STUDIO2500c, Service Manual, Page: 328 / 402

e-STUDIO2500c/3500c/3510c FUSER UNIT / PAPER EXIT SECTION May 2006 © TOSHIBA TEC
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8) Heat roller front thermistor (THM3)
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 thermistor is not related to the temperature control of the fuser belt.
9) Heat roller center thermostat (THMO1) / Heat roller rear thermostat (THMO2)
These thermostats cuts off the power supply to the heater lamps by opening itself if the fuser belt
becomes abnormally hot as a result of the problem such as thermistor malfunction.
These thermostats for the equipment are 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.
10)Pressure roller center thermistor (THM4)
This thermistor detects the surface temperature of the center of the pressure roller and controls the
pressure roller lamp. A non-contact type thermistor is used in order not to damage the paper contact
surface of the pressure roller.
11)Pressure roller rear thermistor (THM5)
This is a contact type thermistor which detects the surface temperature of the pressure roller ends. It
detects the temperature abnormality at the both ends of the pressure 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 pressure roller.
12)Pressure roller thermostat (THMO3)
The thermostat cuts off the power supply to the pressure roller lamp by opening itself if the pressure
roller becomes abnormally hot as a result of the problem such as thermistor malfunction. The ther-
mostat 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.
13)Separation fingers
Five separation fingers are installed above the pressure roller to separate the paper stuck on the
pressure roller.
14)Separation plate
The separation plate is installed above the fuser belt (heat roller) to cover the insufficient separation
often occurs at color printing the mode that the toner is much adhered.
15)Exit sensor (S26)
This sensor detects the arrival of the leading or trailing edge of the paper at the exit roller. It also
detects paper jams in the fuser unit paper exit section and trailing edge of paper turned over for
duplex printing.
16)Exit roller
This roller transports the paper from the fusing section to the inner tray, paper exiting options or the
ADU and is driven by the exit motor.
17)Fuser motor (M17)
This motor drives the fuser unit and the optional bridge unit.
18)Exit motor (M18)
This motor drives the exit roller. It rotates reversely to switch back paper when the equipment is in
the reverse operation.