Mar. 1998 © TOSHIBA 12 - 9 1550/1560 FUSER
12.4 Heater Control Circuit
(1) Temperature detection unit
In order to control the temperature of the heat roller, the temperature detector unit detects the heat-
roller temperature with a thermistor and ON/OFF controls the heater lamp. Heat roller surface tem-
perature 180°C (thermistor resistance value: 7.4 KΩ approx.)
Reference
Relationship between heat roller surface temperature and thermistor
resistance value.
Temperature Thermistor resistance Heater lamp state
Less than 180°C More than 7.4 KΩ ON
180°C 7.4KΩ Maintains previous state
More than 180°C Less than 7.4 KΩ OFF
°C
180
During copying (180°C)
Heat roller
temperature
distribution
Heater lamp
ON
OFF OFF OFF OFF
OFF
OFF
ON ON ON ON ON
Warming up Ready (180°C)
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