Xerox PHASER 8500 Service Manual page 164

General Troubleshooting
4-34
With the drum turning at a constant velocity, the transfix roller is loaded
against the drum, held for one revolution, then raised. The velocity with which
the transfix roller is moved differs for the two tests.
Transfix Drive Slow and Transfix Drive Fast
Typical
R# Definition
Fast
0 Time to first 0.22 to
contact (sec) 0.29
1 Loaded 2600 to
average Y- 4200
Axis
following
error (mpts)
2 Loaded Y- 75 to 1200 150 to
Axis
following
error ripple
(mpts)
3 Time to last .300 to
contact (sec) 0.450
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).
Drum Maintenance Drive
Typical
Value
R# Definition (8400)
0 Time to blade first .01 to .35
contact (sec)
1 Time to roller first .03 to 045
contact (sec)
2 Roller/Blade loaded -700 to
average Y-Axis -250
following error
(mpts)
3 Roller/Blade loaded -50 to 300
Y-Axis following
error ripple (mpts)
Value
Actions
Slow
0.22 to Reports the time from the load
0.50 command to the engine until the drum
indicates contact with the pressure
roller.
2600 to Reports the average Y-Axis following
3400 error during the Roll With Transfix
Roller Down interval.
Reports the difference between the
1100 max and min Y-Axis following errors
during the Roll With Transfix Roller
Down interval
0.30 to Reports the time from the unload
0.80 command to the engine until the drum
indicates no further contact.
Typical
Value (8500/
8550/8560)
.15 to .4
.2 to .50
-650 to -150
0 to 600
Phaser 8400/8500/8550/8560 Color Printer Service Manual
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.