Xerox Phaser 8400 Service Manual page 167

Check Menu Value Key Table (Continued)
Wiper Shaft - Runs the media path drive train and engages the head maintenance clutch on
the fly then disengages the clutch. The test is repeated in both directions to determine clutch
characteristics, steady state drive requirements, bearing status, etc.
Test ID# R Definition
#
Wiper Shaft 0 Time to CCW On
peak fe (sec).
1 CCW On peak
fe.
2 CCW On fe
settling time
(sec).
3 CCW On
average fe.
4 CCW On fe
ripple.
5 CCW Off fe
settling time
(sec)
4-22
Results Interpretation/Actions
Reports how long it takes the
MP motor servo system to react
to the sudden addition of the
wiper shaft load. Larger values
may indicate a slipping or slow
to engage clutch.
Reports the peak effort required
to accelerate the wiper shaft
load. A smaller value could
indicate a slipping clutch.
Reports the time it takes the MP
motor servo system to "settle
down" following the sudden
addition of the wiper shaft load.
A longer time could indicate a
looseness in the wiper shaft
assembly or a slipping clutch.
Reports the average effort
required to rotate the wiper shaft
in the CCW direction at a
constant velocity.
An unusual value could indicate
a difference in the composition
and/or number of the rollers, the
nip pressure, or out of range
mechanical dimensions due to
wear or contamination (such as
paper dust increasing the
effective diameter of a roller).
Reports the variation of effort
needed to rotate the wiper shaft
in the CCW direction at a
constant velocity. A larger value
could indicate particles in the
gears or non uniform
contamination of a roller
(causing a lump).
Reports the time it takes the MP
motor servo system to "settle
down" after the sudden release
of the wiper shaft load. A larger
value may show a dragging or
slow to release clutch.
Phaser 8400 Printer Service Manual