COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)e. The sensitivity of the thermsitor (Note 2) is on the high temperature side at power-on(during initial state), but the upper and lower fixing roller detection signals (FXTHU,FXTHL) are 60°C or less. The thermistor sensitivity is switched from the high to thelower temperature side.At this time, either FXTHU or FXTHL is -10°C or less. (thermistor open circuit)However, if both FXTHU and FXTHL are -10°C or less, the absence of the fixingassembly will be indicated (E813).CHAPTER 6 FIXING SYSTEM6-51. If an error high or low temperature is detected, the M-CPU uses the D-CPU to storea fixing heater error in the error memory capacitor (C259).Once this happens, turn off the power once, leave the printer unit alone for 30 minor more, and turn on the power once again to reset the printer unit.2. Switching the Thermistor SensitivityThe machine’s M-PCU switches the thermistor sensitivity (between low-tempera-ture sensitive mode and high-temperature sensitive mode) to ensure accuratedetection regardless of the range of temperature (low or high) using the thermistorsensitivity switch signal (FXSEL). When the FXSEL signal is ‘0’, the thermistor willbe in low-temperature detection mode; when ‘1’, high-temperature detection mode.Caution:Download free service manual at http://printer1.blogspot.com
