| 摘要 |
PURPOSE:To control properly the temperature of a heater at a fixing section, by inputting a heater temperature setting signal outputted based on a common reference resistance and a heater temperature detecting signal to the same analog input port of a microcomputer. CONSTITUTION:An analog reference voltage set by a split voltage based on resistors 9, 10 is inputted to an input port A3 of a microcomputer 20 and a heater controlling signal generated based on the operation of a CPU in the microcomputer 20 is outputted from an output port P4 to a heater controlling relay 30. Further, a charging section A, an exposure section B, a development section C, a transfer section D and a cleaning section E and also the fixing section F are arranged around a photosensitive drum 33, and a heater 32 of a heat roll 34 of the fixing section F receives the control of power supply from an AC power supply 31 by turning on/off the heater controlling relay 30. |
