Xerox Phaser 8400 Service Manual page 177

X-Axis Drive
This test drives the X-Axis motor in each directions until the printhead stalls into the stops and
then moves the printhead into the clear and performs an on the fly reversal. The power profile is
used to confirm operational goals.
R# Definition
0 Right Stall Power
Level (watts)
1 Left Right Distance
(in)
2 Right Left Traverse
Average Power
Level (watts)
3 Right Left Traverse
Power Ripple (watts)
4 Left Right Traverse
Power Average
Level (watts)
5 Left Right Traverse
Power Ripple (watts)
6 Turnaround Power
Blip Width (watts)
General Troubleshooting
Typical Typical
Value Value
(8400) (8500/
8550)
5 to 10 .5 to 3.3
0.32 to -.15 to .5
0.48
3.5 to 8.5 .5 to 1.55
.20 to 1.8 -0.5 to
1.0
4.0 to 8.5 .5 to 1.75
1.2 to 1.5 -.01 to
.05
.02 to .11
Actions
Reports the motor/drive
electronics stall power.
An abnormal level may indicate a
motor/motor drive problem.
Reports the distance between
the left and right stall points. An
abnormal value may indicate an
problem that restricts the range
of motion (pinched cable, etc.).
Reports the average power
required to move the printhead
from the right hard stop to the left
hard stop. An abnormal value
may indicate a problem with the
lead screw or printhead bearings
(lubrication, etc.).
Reports ripple in the power level
needed to move the printhead
from the right hard stop to the left
hard stop. An abnormal value
may indicate a problem with
roughness in the drive
mechanism or an interference
with the printhead motion.
Same as R2 except for the other
direction of motion.
Same as R3 except for the other
direction of. motion.
Reports the width of the
momentary drop in the required
drive power when the printhead
motion is being reversed. An
abnormal value may indicate an
unusual amount of play in the
drive mechanism.
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