Xerox Phaser 8400 Service Manual page 179

Drum Maintenance Drive
With the Y-axis rotating, the drum maintenance unit is loaded against the drum for a short time in
each configuration (roller and blade/blade only)
R# Definition
0 Time to blade first
contact (sec)
1 Time to roller first
contact (sec)
2 Roller/Blade loaded
average Y-axis
following error
(mpts)
3 Roller/Blade loaded
Y-axis following error
ripple (mpts)
4 Roller Average
Period (sec)
5 Roller Revs
6 Roller Disengaged
Time (sec)
7 Blade loaded
average Y-axis
following error
(mpts)
8 Blade loaded Y-axis
following error ripple
(mpts)
General Troubleshooting
Typical Typical
Value Value
(8400) (8500/
8550)
.01 to .35 .15 to .4
.03 to 045 .2 to .50
-700 to -650 to
-250 -150
-50 to 0 to 600
300
50 to -.05 to
1600 .05
3 to 40
-0.001 to -.05 to
0.05 0.5
-160 to -800 to
-50 -100
-0.001 to 115 to
0.50 900
Actions
Reports the time from the load
command to the engine until the
drum indicates blade contact.
Reports the time from the load
command to the engine until the
drum indicates roller contact.
Reports the average Y-axis
following error during the Roll
With Both Loaded interval.
Reports the difference between
the max and the min Y-axis
following error during the Roll
With Both Loaded interval.
Reports the average period of
the Y-axis following error ripple
during the Roll With Both Loaded
interval. This variation would be
due to the dmu roller rolling
along the drum surface.
Reports the number of Y-axis
following error ripple peaks
during the Roll With Both Loaded
interval.
Reports the time from the unload
roller command to the engine
until the drum indicates no
further roller contact.
Reports the average Y-axis
following error during the Roll
With Blade Loaded interval.
Reports the difference between
the max and the min Y-axis
following error during the Roll
With Blade Loaded interval.
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