Toshiba e-STUDIO 550, Service Manual

Page: 207 / 346

JUNE 2002 © TOSHIBA TEC 14 - 1 e-STUDIO550/650/810 FUSER UNIT
14. FUSER UNIT
14. 1. General Description
The toner is fused on the paper separated from the photoconductive drum by applying heat and pressure to
it. The paper is then discharged through the paper exit section. The fuser unit consists of the IH coil, fuser
roller, pressure roller, separation fingers, cleaning web, cleaning rollers, thermistors, thermostat, exit rollers,
exit sensor, etc.
14. 2. Operation
At the fuser unit, the toner is fused on the paper which has been separated and transported from the
photoconductive drum by applying heat and pressure to it.
The fuser roller is rotated by the driving of the fuser motor and has an IH coil inside, which does not rotate
itself. The fuser and pressure rollers are always pressured by a spring force.
After being fused, the paper is separated smoothly from the fuser roller by the separation fingers.
The thermistor detects the fuser roller temperature to control it, and when the temperature becomes
abnormally high, which is detected by the thermostat, the power supply to the IH coil is cut off.
Web pushing roller Cleaning web
Web detection sensor
Web motor
Exit roller
Separation finger
Fuser unit exit sensor
Cleaning roller (metal)
Pressure roller
Cleaning roller (felt)
Fuser roller thermistor
Thermostat
IH coil
Pressure roller thermistor
[Sectional view]
Fuser roller