Xerox Phaser 8400 Service Manual page 158

Deskew Shaft (Continued)
Runs the media path drive train and engages the deskew 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.
R# Definition
5 CCW Off fe settling
time (sec).
6 Time to CW On
peak fe (sec).
7 CW On peak fe.
8 CW On fe settling
time (sec).
9 CW On average fe.
4-18
Typical Typical
Value Value
(8400) (8500/
8550)
0.010 to 0 to .5
0.20
0.010 to 0 to .05
0.06
-950 to -7.0 to
-450 -2.0
0.010 to 0 to .2
0.20
-610 to -3 to 1.3
-220
Phaser 8400/8500/8550 Color Printer
Actions
Reports the time it takes the MP
motor servo system to "settle
down" after the sudden release
of the deskew shaft load.
A larger value can indicate a
slow to release or dragging
clutch.
Reports a time that indicates
how long it takes the MP motor
servo system to react to the
sudden addition of the deskew
shaft load. Larger values may
indicate a slipping or slow to
engage clutch.
Reports the peak effort required
to accelerate the deskew shaft
load. A smaller value could
indicate a slipping clutch.
Reports the time it takes the MP
motor servo system to "settle
down" after the sudden addition
of the deskew shaft load.
A longer time could indicate a
looseness in the deskew shaft
assembly or a slipping clutch.
Reports the average effort
required to rotate the deskew
shaft in the CW 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).