Ricoh Neptune-P1 Service Manual page 430

Fusing Temperature Control: Temperature Feedback During Copying
This machine uses the feedback of the hot roller thermistor and two pressure roller thermistors, one at the
center and one at the end of the pressure roller, to control the fusing temperature. The SP codes settings
shown in the tables and illustrations below determine how fusing temperature is controlled for the paper
thickness modes (Mode 1 to 5) for each type of paper.
Here is a quick summary of the SP codes that are used to maintain optimum fusing temperature.
• These SP codes are set at the factory and normally should not require adjustment in the field.
1931 TTemp:HotRol
1932 TTemp:PreRol
1934 LTemp:HotRol
1935 LTemp:PreRol
1941 PreFB:TDiff
1942 PreFB:THI:NP
1943 PreFB:HT:SP
1944 PreFB:LT:SP
1948 PreRol TTemp
Here are more details about the settings of these SP codes.
SP No.
1931-1 to 5 120 to 220
-6 to 10 120 to 220
Sets the target temperature of the hot roller.
Sets the target temperature of the pressure roller
Sets the minimum difference in temperature allowed between the actual
temperature and the target temperature of the hot roller
Changes the stepped adjustments of SP1932 (Target Temp: Pressure
Roller) by using the sum of the settings of SP1932 (Target Temp:
Pressure Roller) +SP1935 (Press FB Control Steps).
Sets the temperature differential that determines when the machine
switches to the supplement mode for pressure roller feedback control.
(See description below.)
Sets the interval between temperature samplings for pressure roller
feedback control.
This SP sets the high temperature used by pressure roller feedback
temperature control for Custom paper.
Sets the low temperature used by pressure roller feedback temperature
control for Custom paper.
This SP determines when inching starts.
Range
Mode
Plain
Translucent
Initial Setting
1 2 3
195 195 195
205 195 195
Fusing Unit
6
4 5
185 175
165 165
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