Ricoh B286, Service Manual, Page: 584 / 622

Fusing Unit
B286/B289 6-76 SM
1941-1
0 to 50 Plain
20
1942-1 to 5*
1
0 to 50 Plain 0 0 5 15 0
1943-1 to 5*
1
0 to 50 Plain 0 0 20 20 0
1944-1 to -5 0 to 50 Plain 0 0 10 5 0
1948-1 to 5
60 to 180 Plain 100 65
60
60 60
-6 to 10 60 to 180 Translucent 130 100 60 60 60
-11 to x15 60 to 180 Film 60 60 60 60 60
*
1
SP1942, SP1943, SP1944 do not operate if they are set to “0.”
Pressure Roller Temperature Feedback
The graph and descriptions below (Plain Paper, Mode 3 selected) show how the
temperature of the hot roller is controlled using the difference in the temperatures of the
center and end of the pressure roller.
The temperature readings are fed back by the pressure roller thermistors (one at the end
and one at the center of the pressure roller). These difference between these readings are
compared with the value set for SP1941 (Press FB Ctrl Switch by Temp Diff).
Difference between Center, End Temperatures
< SP1941 (20
o
C) > SP1941 (20
o
C)
Hot Roller
Control Temp.
SP1931 to SP1935
(Black Line)
SP1942 to SP1944
(Blue Line)