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13.4.2
Temperature detection section
To maintain the surface temperature of the fuser roller at a certain level, 3 thermistors (center, side and
edge) detect the surface temperature of the fuser roller to turn ON/OFF and control 2 heater lamps
(center and side).
1) Relation between the thermistor output voltage and surface temperature of the fuser roller
Output voltages of thermistors [V]
Approx. 0.5
Approx. 1.9
Approx. 3.8
2) Control of the surface temperature of the fuser roller
°C
180
Temperature
of fuser roller
0
Remark:
During warming-up, 2 heater lamps (center and side) are turned ON to raise the surface temper-
ature of the fuser roller. During ready and printing status, each heater lamp is turned ON/OFF
alternately to maintain the surface temperature of the fuser roller at a certain level (setting tem-
perature of each status).
3) Temperature control for the both ends of the fuser roller
During continuous printing, the temperature of the end of the fuser roller (area where the paper does
not pass on) generally tends to be higher than that of other areas (areas where the paper passes
on). For this reason, the edge thermistor detects the temperature of the end of the fuser roller. When
this thermistor detects the abnormal temperature (230ºC), the heater lamp is turned OFF regardless
of the temperature of the area where the paper passes on.
e-STUDIO200L/230/280 FUSER UNIT
Warming-up
Ready ( 180°C )
Heater lamp ON
OFF
ON OFF ON OFF
Surface temperatures of fuser roller [ºC]
40
100
180
During printing ( 180°C )
ON
Fig.13-4
13 - 6
OFF
ON
OFF
ON
June 2004 © TOSHIBA TEC
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