Ricoh B286, Service Manual, Page: 587 / 622

Fusing Unit
SM 6-79 B286/B289
Det
ails
Fusing Temperature Control: Inching
The default setting for this machine is for inching control to always remain on.
! This inching control on/off setting (controlled by SP9952) should never be
switched off.
During inching control:
! When the temperature of the hot roller falls to 20°C (SP1937-3) below its target
temperature, the fusing motor switches on and idling starts.
! When the pressure roller reaches its target temperature, the fusing motor switches off
and idling stops.
! The target temperature of the pressure roller is controlled by the settings of
SP1932 (Target Temperature: Pressure Roller) for each paper type.
Fusing Temperature Control: CPM Down
During a long copy job on narrow width paper, the difference in the temperatures between
the center and end of the pressure roller increases. The temperature at the center
decreases and the temperatures at the ends increase. In order to prevent this, CPM down
control automatically adjusts the timing of paper feed. This increases the length of the
interval between sheets in the paper path.
A longer interval between sheets creates a short delay between feeds to the fusing unit.
This extra time allows slightly more time so that the temperature of the hot roller and
pressure roller can rise.
! The operation of CPM down is controlled by SP1940-1 (CPM Down Setting). This SP
code should remain on.
! For more about adjusting these settings see the description of SP1940 in “Service
Tables.”