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e-STUDIO3511/4511 FUSER UNIT/PAPER EXIT SECTION 16 - 8 November 2003 © TOSHIBA TEC
16
16.4.5 Temperature detection section
To maintain the stable temperature of the fuser belt, the thermistor detects the temperature and controls
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:
°C
180
0
Ready (
180°C
)Warming-up
Temperature
of fuser belt
During printing (
180°C
)
OFFIH coil ON ON OFF ON OFF
ON
OFF
OFF
ON ON
Fig. 16-404
(3) Temperature control for the both ends of the fuser belt
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 250°C, the heater is automatically turned OFF regardless of the temperature of the area
where the paper passes on.
(2) Control of the surface temperature of the fuser belt:
Output voltages of thermistors [V]
Approx. 0.30
Approx. 1.77
Approx. 3.28
Approx. 3.66
Approx. 3.81
Approx. 4.03
Surface temperatures of fuser belt [
o
C]
40
100
150
170
180
200