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:

Output voltages of thermistors [V]

Surface temperatures of fuser belt [oC]

 

 

Approx. 0.30

40

 

 

Approx. 1.77

100

 

 

Approx. 3.28

150

 

 

Approx. 3.66

170

 

 

Approx. 3.81

180

 

 

Approx. 4.03

200

 

 

(2) Control of the surface temperature of the fuser belt:

16

°C

180

Temperature of fuser belt

0

Warming-up

Ready (180°C)

During printing (180°C)

IH coil ON OFF ON OFF ON OFF ON

OFF ON OFF 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.

e-STUDIO3511/4511 FUSER UNIT/PAPER EXIT SECTION 16 - 8

November 2003 © TOSHIBA TEC

Page 286
Image 286
Toshiba 3511, 4511 manual Temperature detection section, Control of the surface temperature of the fuser belt