Xerox Phaser 8400 Service Manual page 178

Transfix Drive Slow and Transfix Drive Fast
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.
R# Definition
0 Time to first
contact (sec)
1 Loaded
average Y-
axis following
error (mpts)
2 Loaded Y-
axis following
error ripple
(mpts)
3 Time to last
contact (sec)
4-38
Typical Value
Fast Slow
0.22 to 0.22 to
0.29 0.50
2600 to 2600 to
4200 3400
75 to 150 to
1200 1100
.300 to 0.30 to
0.450 0.80
Actions
Reports the time from the load command
to the engine until the drum indicates
contact with the pressure roller.
Reports the average Y-axis following error
during the Roll With Transfix Roller Down
interval.
Reports the difference between the max
and min Y-axis following errors during the
Roll With Transfix Roller Down interval
Reports the time from the unload
command to the engine until the drum
indicates no further contact.
Phaser 8400/8500/8550 Color Printer