Temperature Control - Ricoh B286 Service Manual

6.9.4 HOT ROLLER THERMISTORS AND THERMOSTATS
Three thermistors monitor the temperature of the hot roller and pressure roller:
! Thermistor [A] monitors the temperature of the hot roller.
! Two thermistors [B] monitor the temperature of the pressure roller. One thermistor is at
the center of the pressure roller and the other is near the end of the pressure roller.
Thermostat [C] (199°C) and thermostat [D] (200°C) give emergency heat protection. If one
of the thermistors breaks, one of the thermostats will cut power to the fusing lamp. Also,
interlock switches cut power to the fusing circuit when a cover is opened.

6.9.5 TEMPERATURE CONTROL

Paper Thickness Setting
To achieve and maintain optimum fusing, the operator must select on the operation panel
the proper setting for the thickness of the paper. This ensures that the machine sets and
maintains the correct target temperatures for the hot roller and pressure roller during the
job.
! Strict control of the fusing temperature is necessary to prevent wrinkling that can
occur at high temperatures with different types of paper.
Changing the paper thickness default setting can improve results if copy images are
blurred or wrinkled. The paper thickness default setting screen can be opened by the
operator with the User Tool:
[User Tools] > "System Settings" > "Tray Paper Settings" > "Paper Thickness" > "Paper
Tray" or "Bypass."
SM 6-69
Fusing Unit
B286/B289