Overview - Ricoh FT5540 Service Manual

12.1 OVERVIEW

The image is fused to the copy paper by two rollers which apply heat and pressure. The hot
roller [A] is made of teflon and the pressure roller [B] is made of silicone rubber but has a
teflon tube coating. Pressure is constantly applied between the rollers.
The fusing lamp, which is located inside the hot roller, is turned on and off to maintain the
operating temperature. The temperature control circuit monitors the hot roller surface
temperature through a thermistor.
The oil supply pad [C] applies silicone oil to the hot roller. The oil blade [D] then spreads the
oil evenly across the hot roller. The oil reduces the adhesion between paper and the hot roller
(reducing misfeeds), reduces paper curl, and helps to keep the roller clean by reducing the
amount of toner transferred to the hot roller surface. The oil supply pad also cleans the hot
roller.
The hot roller strippers [E] separate the copy from the hot roller and direct it to the fusing exit
rollers [F].
2-79
31 August 1989