Canon M3010 Series Service Manual

Contents

Canon M3010 Series Service Manual Manual pdf 35 page image

22 2-202-20Technical Overview > Fixing System > Various Control Mechanisms > Protective FunctionsTechnical Overview > Fixing System > Various Control Mechanisms > Protective FunctionsVarious Control Mechanisms■ Fixing Temperature Control● Heater Temperature ControlThe heater temperature control is to keep the fixing heater in the fixing film unit to thespecified temperature.The engine controller monitors the Fixing Heater (H1) temperature detection signal (FSRTH)and outputs the fixing heater drive signal (FSRD) according to the detected temperature.The fixing heater drive PCB controls the Fixing Heater (H1) according to this signal to keepthe fixing heater temperature within the target values.(220-240V model only)FU101RL101+24VFREQSNSFSRDRLYD (24VOFF)FSRTHCPUEngine controllerFixing heater (H1)PressurerollerThermistor (TH1)Thermal fuse (TP1) Fixing filmLow-voltagepower supplyFrequencydetectioncircuitFixing controlRelay drivecircuitFixing heaterdrive circuitFixing heatersafety circuitF-2-23Fixing target temperature varies according to the fixing mode, and there are 8 types of themode.These modes are determined according to the paper type settings and resolution settings (seethe caution) in a driver.The following table shows the relationship between the fixing target temperature and thesettings (paper type settings and resolution settings) in a driver.Printer driver settings Fixing targettemperaturePaper type settings Vertical scanningPlain paper 600 dpi 155 to 165 deg C400 dpi 170 to 190 deg CPlain paper L 600 dpi 145 to 155 deg C400 dpi 160 to 180 deg CHeavy paper 600 dpi 170 deg CHeavy paper H 600 dpi 185 deg CTransparency 600 dpi 150 to 160 deg C400 dpi 165 to 180 deg CPostcard/postcard H 600 dpi 188 deg C400 dpi 188 deg CEnvelope 600 dpi 160 to 165 deg CLabels 600 dpi 170 deg CCAUTION: Resolution switchingThe machine provides two types of resolution: 600 x 600 dpi and 600 x 400 dpi.The selection is made by the "Copy Type" setting in the printer driver.For speed priority (at the time of shipment), 600 x 400 dpi is selected, but changing toresolution priority selects 600 x 600 dpi.■ Protective Functions● Protective Function of fixing assemblyHost machine carries the following 3 functions to prevent the Fixing Heater (H1) fromoverheating.1) Protective function by CPUCPU of engine controller monitors the Thermistor (TH1) temperature consistently.When Thermistor (TH1) reaches approx 220 deg C, CPU determines that the Fixing Heater(H1) is overheating and stops the fixing heater drive signal (FSRD) output and also turnsOFF relays to shut the power supply to Fixing Heater (H1).T-2-5