December 2002 TOSHIBA TEC
14 - 9
e-STUDIO160/200/250 FUSER UNIT/EXIT UNIT
14.6.2 Temperature detection by the thermistor
* The detection circuits for heater thermistors 1 and 2 are equal to each other. Here, heater thermistor 1
is described.
Fig. 14-6-2
• The input voltage is obtained by dividing the +5V among R342, Heater thermistor 1 and R337.
• The surface temperature of the heat roller varies.
• The resistance of the heater thermistor 1 changes.
• The input voltage changes.
• The input voltage is converted to digital data by the A/D converter and output to the register of the
system control GA. The CPU reads this value and detects a change in the data to judge if the heat roller
temperature is normal or abnormal.
14-06-02
+5V
R342
Heater
thermistor 1
R337
SG
TH
ADCDO
+5V
IC23
A/D
converter
IC34
System
control
GA
IC66
CPU
Summary of Contents for e-studio 160
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Page 223: ...e STUDIO160 200 250 PCB BOARD 16 2 December 2002 TOSHIBA TEC 16 2 PWA F RLY 16 02 01 ...
Page 224: ...December 2002 TOSHIBA TEC 16 3 e STUDIO160 200 250 PC BOARD 16 3 PWA F PIF 16 03 01 ...
Page 226: ...December 2002 TOSHIBA TEC 16 5 e STUDIO160 200 250 PC BOARD 16 6 PWA F SLG 16 06 01 ...
Page 228: ...17 WIRE HARNESS CONNECTION DIAGRAMS 17 1 ...
Page 255: ...1 1 KANDA NISHIKI CHO CHIYODA KU TOKYO 101 8842 JAPAN ...