Canon MF4100 Series Service Manual

Contents

Canon MF4100 Series Service Manual Manual pdf 83 page image

Chapter 88-18.1 Overview/Configuration8.1.1 Specification/Control/Function List 0014-5589i-SENSYS MF4150 / i-SENSYS MF4140 / i-SENSYS MF4120 /T-8-18.1.2 Overview 0014-5594i-SENSYS MF4150 / i-SENSYS MF4140 / i-SENSYS MF4120 /The fixing unit employees the on-demand fixing method, and it is composed of fixing film unit, in which the fixing heater, thermistor, and temperature fuse areincorporated, and the pressure roller.The pressure roller and the delivery roller are driven with the main motor (M1).A paper separated from the photosensitive drum is fed to inside of the fixing assembly, and the toner is fixed on a paper with the fixing film and the pressure roller.A paper being fixed is detected with the delivery sensor (PS803); then, delivered to outside of the machine via the delivery roller.F-8-1[1] Pressure roller[2] Fixing film[3] Delivery rollerH1: Fixing heaterPS803: Delivery sensorThe fixing heater is the heater (ceramic heater) that the heating pattern is deposited on the ceramic plate.By heating the fixing film with the fixing heater, it gives heat to passing papers.The thermistor (TH1) locates at the center of the fixing heater (H1), and detects the temperature of the heater.The temperature fuse (TP1) locates at the top center of the fixing heater. If the temperature of the fixing heater increases abnormally, it blocks power supply to theheater by meltdown.The temperature control of the fixing assembly composed of the foregoing components is executed at the fixing control circuit on the DCNT board with the instruc-tion of the CPU (IC902). There are the fixing heater drive circuit and the fixing heater safety circuit in the fixing control circuit.Item Function/MethodFixing method On-demand fixingFixing heater Flat heaterFixing temperature detection Thermistor (TH1): temperature control, detection of abnormalityTemperature fuse (TP1): detection of abnormalityFixing temperature control Temperature control at startupTemperature control at normal timesTemperature control at sheet-to-sheet intervalProtection function Temperature error detection with the thermistorTemperature rise detection with the temperature fuse