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