RICOH AFICIO 650
Service Manual

IMAGE FUSING

June 30, 1998

2.9 IMAGE FUSING
2.9.1 OVERVIEW
[A] [F] [G] [E] [D] [J] [K]

[H] [C] [C] [B]
A229D518.WMF

[I]

After the developed latent image is transferred from the drum to the paper, the copy paper enters the fusing unit. Then the image is fused to the copy paper by a heat and pressure process through the use of a hot roller [A] and pressure roller [B]. There are two fusing lamps in the hot roller. Both lamps are 550 W lamps. They switch on and off at the same time. The fusing lamps turn on and off to keep the operating temperature at 185°C. The CPU monitors the hot roller surface temperature through a thermistor [D] which is in contact with the hot roller surface. A thermofuse [E] protects the fusing unit form overheating. The hot roller strippers [F] separate the copy paper from the hot roller and direct it to the fusing exit rollers [G]. The exit sensor in the inverter and paper exit unit monitors the progress of the copy paper through the fusing unit and acts as a misfeed detector while the exit rollers feed the copy paper to the inverter section. The hooking position of the tension springs [H] on the pressure lever [I] adjusts the roller pressure. The oil supply roller [J] applies a light coat of silicone oil to the hot roller. The oil supply cleaning roller [K] remove the paper dust accumulated on the cleaning roller.

2-110