KIP 9000 Service Manual page 98

The value of [SP: white] adjusted by the Auto SP Control relies on the "Target Surface Potential"
that is specified on the following service modes to each setting points (5 to 30
step) respectively.
Service Mode 5-A3 : Target Surface Potential at 5
5-A4 : Target Surface Potential at 10
5-A5 : Target Surface Potential at 15
5-A6 : Target Surface Potential at 20
5-A7 : Target Surface Potential at 25
5-A8 : Target Surface Potential at 30
If the current temperature condition is 15
set to "-400V" for example, the Auto SP Control tries to adjust the [SP: white] to -400V.
Reference
(1) The Target Surface Potential can be specified only to the setting points of 5 degrees step.
Between 2 setting points are plotted with linear curve, and necessary [SP: white] is
automatically calculated.
-450V
-400V
-350V
-300V
(2) Normally a higher value (more negative value) is specified to lower temperature
expecting the Auto Density Control will increase the Bias greatly for low temperature.
The Auto SP Control can work when it is set to ON in the Service Mode 5-A2 (or User Mode D).
The Auto SP Control takes potential adjustment when;
•
the Fuser is colder than 50 degrees centigrade at power on.
•
the inside temperature changes more than 3 degrees since the last Auto SP Control.
•
24 hours has passed since the last Auto SP Control.
•
any parameter concerned with the Auto SP Control is changed.
•
the Auto SP Control is newly activated or inactivated.
•
the Target Surface Potential is changed.
Auto SP Control adjusts the density as follows.
1. The Surface Potential Sensor detects the surface
potential of Drum, which is given with the current
setting of "Grid Plate Current".
o
C and the Target Surface Potential specified to 15
5 10 15 20
Surface Potential Sensor
3-25
o
C
o
C
o
C
o
C
o
C
o
C
o
25 30 C
o o
C by every 5 C
o
C is
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