Fusing Mechanism - Ricoh B064 Service Manual

6.10.2 FUSING MECHANISM

The hot roller [A] and pressure roller [B] fuse the toner to the paper .
The hot roller, constructed of soft silicone rubber, is about 0.3 mm thick and coated
with a thin coat of Teflon (30 µ).
Two fusing lamps [C] (550 W) are inside the hot roller.
Two thermostats [D] are positioned above the hot roller near the center.
One thermistor [E] is also positioned above the hot roller near the center.
Another thermistor [F] is in contact with the end of the hot roller.
Thermistors
Center (non-contact) thermistor
End (contact) thermistor
*1
Thermostats
Center (non-contact) thermostats
*1
If the thermostats trigger an alert, the thermostat requires replacement.
A fusing exit sensor, located between the hot roller and paper exit roller, detects
paper jams inside the fusing unit.
NOTE: The term thermostat and thermoswitch are often used interchangeably.
Both refer to a device in which bi-metal contacts will open at a specific
temperature.
SM
[E]
[D]
[C]
Temperature control
Overheating protection
Overheating protection
6-103
IMAGE FUSING AND PAPER EXIT
[F]
[A]
[B]
B064D502.WMF
B064/B065