Olivetti d-Copia 284MF Service Manual

Also see for d-Copia 284MF: Quick installation guide Quick installation guide Operation guide Operation guide

2JN2-1-142-1-7 Fuser sectionThe toner on the paper is molten and pressed into the paper as it passes between the heat roller and the press roller in thefuser unit. The heat roller has a heater lamp inside which continuously turns on and off by the fuser thermistor to maintainthe constant temperature onto the heat roller surface. The heat roller is resin coated by florin to prevent toner from accu-mulating on the roller after a long run. Care must be taken while handling the heat roller not to scratch the roller surface asdoing so may result in print problems. Fuser temperature is optimized to the paper type. The heat roller has four separa-tors (claws) which are continuously in contact with its surface. These separators (claws) prevent the paper on which tonerhas been fused from being wound around the heat roller causing paper jam. The press roller is made of the heat-resistantsilicon rubber. This roller is used to strongly press the paper towards the heat roller by means of press springs. The tem-perature of the heat roller is constantly monitored by the control PWB using the fuser thermistor. Should the temperatureof the heat roller exceed the predetermined value, the fuser thermal cutout is activated to effectively disconnect the heaterlamp from power.Figure 2-1-21 Fuser unit12910111236741415138 5(1) Upper fuser frame(2) Lower fuser frame(3) Heat roller(4) Press roller(5) Fuser heater lamp(6) Fuser thermal cutout(7) Fuser thermistor(8) Separators(9) Fuser bushes(10) Press springs(11) Press spring holders(12) Fuser lever L (R)(13) Exit sensor(14) Actuator (exit sensor)(15) Fuser guide pulleyService Manual Y111030-4