Pressure Roller Temperature Feedback - Ricoh B286 Service Manual

Fusing Unit
1941-1
1
1942-1 to 5*
1
1943-1 to 5*
1944-1 to -5
1948-1 to 5
-6 to 10
-11 to x15
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).
o
< SP1941 (20 C)
Hot Roller
Control Temp.
B286/B289
0 to 50 Plain
0 to 50 Plain
0 to 50 Plain
0 to 50 Plain
60 to 180 Plain
60 to 180 Translucent
60 to 180 Film
Difference between Center, End Temperatures
> SP1941 (20
SP1931 to SP1935
(Black Line)
0 0
0 0
0 0
100 65
130 100
60 60
o
C)
SP1942 to SP1944
6-76
20
5 15
20 20
5
10
60 60
60 60
60 60
(Blue Line)
0
0
0
60
60
60
SM