Ricoh 002052MIU User Guide - Page 133
FUSING, Thermostat, Heat Roller, Pressure roller, Safety Features
UPC - 026649118692
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SYSTEM LAYOUT 6.2.4 FUSING The fusing unit contains a heat lamp, heat roller, pressure roller, thermistor, and thermostat. With pressure and heat, the fusing unit fuses (melts) the toner onto the paper. This completes the printing job. Thermostat The thermostat cuts power if the heat lamp or the heat coil of the heat roller gets too hot. Thermistor The thermistor checks the surface temperature of the heat roller, and regulates the temperature of the heat roller. Heat Roller The heat roller gets heat from the heat lamp. Then it heats the surface of the paper. The heat roller is coated with Teflon to prevent the melted toner from sticking to the heat roller. Pressure roller The pressure roller, located below the heat roller, is made of silicon resin, and the surface of the roller is coated with Teflon. The toner is fused onto the paper when the sheet of paper passes between the heat roller and the pressure roller. Safety Features There are 3 procedures to prevent the machine from overheating. • 1st: Hardware cuts power when the machine gets to an overheat condition. • 2nd: Software cuts power when the machine gets to an overheat condition. • 3rd: Thermostat power. Safety device • Power is removed from the fusing unit when the front cover is open. • Overheat safety device for customer. • Keeps the surface temperature of the fuser cover less than 80°C. A customer caution label is adhered inside of the rear cover. Detailed Descriptions SM 6-3 B173