Functions - Toshiba e-STUDIO2330C Service Manual
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Also See for e-STUDIO2330C:
- Service handbook (512 pages) ,
- Management manual (226 pages) ,
- Copying manual (174 pages)
Table of Contents
16.3 Functions
1. Center heater lamp (LAMP1) / Side heater lamp (LAMP2) / Sub heater lamp (LAMP4)
These halogen lamps heat the heat roller. The center heater lamp (LAMP1) and the side heater
lamp (LAMP2) are lit alternately to heat the heat roller. The sub heater lamp (LAMP4), which is
installed only in the e-STUDIO4520C, heats the heat roller when this equipment starts printing
immediately after its power has been turned ON in order to prevent a fall in temperature on the fuser
belt surface.
Each heater lamp has its coil in a different location. The coil of the center heater lamp (LAMP1) is in
its center, those of the side heater lamp (LAMP2) are on both sides, and that of the sub heater lamp
(LAMP4) is wound over its entire surface. The heater lamps are fixed inside of the heat roller so that
they will not be separately rotated during its rotation.
2. Heat roller
The heat roller is an alminium roller which conducts heat generated by the heater lamp to the fuser
belt. The heat roller in this equipment is a thin roller which enhances heat conduction, and thus the
warming-up time is shortened.
3. Fuser belt
The fuser belt couples the heat roller with the fuser roller, and it conducts heat from the heat roller to
the fuser roller and paper to melt toner on the paper.
The thin fuser belt enables to reduce warming up time and mode changing time. To prevent the
fuser belt from adhering toner, the surface of the fuser belt is fluorinated.
4. Fuser roller
The fuser roller is pressed against the pressure roller with the fuser belt in-between. By this
pressure between the fuser roller and pressure roller, the heat conduction to the paper is enhanced
so that toner becomes easier to be melted, and melted toner is soaked into the paper. In order to
improve the fusing ability, the fuser roller with sponge surface is employed to expand the nip width.
5. Pressure roller
The pressure roller is a rubber roller which ensures proper nip width between the pressure roller and
fuser roller / fuser belt, and it is pressed on the fuser roller / fuser belt by springs in order to fuse
toner effectively to the paper.
Also, a heater lamp is fixed on the inside of the pressure roller to stabilize the surface temperature of
the pressure roller. The heater lamp does not rotate even when the pressure roller is rotating.
6. Pressure roller lamp (LAMP3)
The pressure roller lamp is a halogen lamp which is turned ON/OFF constantly to maintain the
preset temperature in order to stabilize the surface temperature of the pressure roller, reduce
warming up time and enhance fusing ability. Unlike the center heater lamp / side heater lamp, the
whole part of the pressure roller lamp generates heat.
7. Fuser belt center thermopile (THMP1) / Fuser belt rear thermopile (THMP2)
The thermopiles are high-sensitivity infrared thermistors to detect the surface temperature of the
fuser belt. Non-contact type thermistors are used in order not to damage the paper contact surface
of the fuser belt. One thermopile fixed each on the center and rear-side of the frame detects the
temperature of the center and edge of the fuser belt, and controls the center heater lamp / side
heater lamp.
These thermopiles detect the temperature of the fuser belt to maintain it in a certain temperature
range (actually around 155°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 heater lamps, and when it is higher than the
preset temperature, it cuts off the supply.
© 2008, 2009 TOSHIBA TEC CORPORATION All rights reserved
e-STUDIO2330C/2820C/2830C/3520C/3530C/4520C
16 - 3
FUSER UNIT / PAPER EXIT SECTION
16
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