Ricoh Neptune-P1 Service Manual page 433

6. Details
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.
6
• 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 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".
432
96-120 174-165
< 121 165
HR:SP1931-SP1934
PR:SP1932+SP1935
HR:SP1931+(SP1934+SP1944)
PR:SP1932+(SP1935+SP1943)