NOTE:• With MF8200 series, this control is not executed since detection of temperature by the Sub Thermistor is not performed.• Tempreture of Sub Thermistor: T1 < T2 < T3 < T4● Reduction of Throughput by Feeding Small Size PaperNOTE:When paper size is specified by user, paper interval is increased from the 2nd sheet of the job.When a sensor detects that the paper size is small, paper interval is increased from 3rd or 4th sheet of the job.Based on the combination of detection result of the Pre-registration Detection Sensor and detection result of paper length (L),paper interval extension time is determined according to the table shown below.Category Paper type1 Plain paper (environment temperature is 18 deg C or lower),heavy paper 1, heavy paper 22 Plain paper (environment temperature is higher than 18 deg C), heavy paper 3, label paper3 OthersPre-registration Detec-tion SensorPaper length (L) Paper interval extension time (seconds)1 2 3ON - 0 (Not extended)OFF L >/= 270 mm 10 8 6L < 270mm 8 4 2■ Fixing temperature controlThe fixing control circuit controls temperatures of the fixing heater to attain the respective target temperatures.The figure below shows this circuit schematically.MAINTH/RLD-FSRD+RL901THFU1Fixing heatersafety circuitDC controllerFU1䠖Temperature fuseTH䠖ThermistorFixing assemblyixing heaterdrive circuitRelaydrivecircuitFixing control circuitPressureroller/RLD+FSRD-FuseFU901Fixing film unitThe DC controller monitors the fixing heater temperature detection signal (MAINTH) to output the respective fixing heater drivesignals (FSRD+, FSRD-) depending on the detected temperatures. The fixing heater drive circuit controls the fixing heater basedon the output signal to attain the target temperature in the fixing heater.1. Start-up temperature controlThis controls the fixing heater warm-up to the target temperature.Different temperatures are targeted depending on elapsed time after the last print job, paper types or the environment.2. Technical Explanation42
