Temperature Detection Section - Toshiba e-STUDIO453 Service Manual

13.4.5 Temperature detection section

To maintain the stable temperature of the fuser belt, the thermistor detects the temperature and con-
trols ON/OFF of the IH coil. Output from the thermistors is used to detect the abnormality.
(1) Relation between the thermistor output voltage and surface temperature of the fuser belt
(2) Control of the surface temperature of the fuser belt
13
Temperature
of fuser roller
(3) Temperature control for the both ends of the fuser roller
During the continuous printing, the temperature of the both ends of the fuser belt (areas where
the paper does not pass on) generally tend to be higher than that of the other areas (areas where
the paper passes on). The temperature of the ends are detected by the front edge thermistor, and
when it reaches 280°C, the heater is automatically turned OFF regardless of the temperature of
the area where the paper passes on.
e-STUDIO350/352/353/450/452/453
FUSER UNIT / PAPER EXIT SECTION
Output voltages of thermistors [V]
Approx. 0.5
Approx. 2.0
Approx. 3.5
Approx. 4.0
Warmng-up
°C
200
IH col ON OFF
0
Surface temperatures of fuser belt [
100
160
200
Ready ( 200°C ) Durng prntng ( 200°C )
ON OFF ON OFF ON
Fig. 13-404
13 - 8 © 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved
o
C]
40
OFF ON OFF ON