Temperature Detection Section - Toshiba e-STUDIO520 Service Manual

14.4.5

Temperature detection section

To maintain the fuser roller at a constant temperature, the two fuser roller thermistors (front and rear)
detect the fuser roller temperature and control the on/off of the IH coil. The abnormal temperature of the
IH coil is detected by the three fuser roller thermistors (front, center and rear), while that of the pressure
roller is detected by the pressure roller thermistor.
1) Relation between the thermistor output voltage and surface temperature of the fuser roller
Output voltages of thermistors [V]
Approx. 0.5
Approx. 2.0
Approx. 3.4
Approx. 3.6
Approx. 3.8
Approx. 4.0
2) Control of the surface temperature of the fuser roller
Temperature
e-STUDIO850
200°C or above
200°C
170 to 200°C
(160 to 200°C *1)
170°C or below
(160°C or below *1)
*1: Only for the JPD model *2: Only for the TWD model
C
200
170
Temperature of
fuser roller
(Example: e-STUDIO850)
0
March 2005 © TOSHIBA TEC
Surface temperatures of fuser roller [°C]
e-STUDIO520/600/720
200°C or above
200°C (185°C *1)
160 to 200°C
(150 to 200°C *1)
(155 to 200°C *2)
160°Cor below
(150°C or below *1)
(155°C or below *2)
Warming-up Ready
IH coil ON OFF ON
Fig.14-6
14 - 9
40
100
160
170
185
200
Fusing control
IH coil OFF
Ready status
IH coil ON
Copying is interrupted and the fuser roller is
heated. (Waiting status)
During printing Ready
OFF ON OFF ON OFF
e-STUDIO520/600/720/850 FUSER UNIT
During During
printing waiting
ON ON
14