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4-14 Phaser 8400/8500/8550/8560 Color Printer Service Manual
General Troubleshooting
3 CCW On average fe. 250 to 600 1.0 to 2.5 Reports the average effort
required to rotate the deskew
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).
4 CCW On fe ripple. 115 to 360 0 to 2.0 Reports the variation of effort
required to rotate the deskew
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).
5 CCW Off fe settling
time (sec).
0.010 to
0.20
0 to .5 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.
6 Time to CW On
peak fe (sec).
0.010 to
0.06
0 to .05 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.
7 CW On peak fe. -950 to
-450
-7.0 to
-2.0
Reports the peak effort
required to accelerate the
deskew shaft load. A smaller
value could indicate a slipping
clutch.
Deskew Shaft (Continued)
R# Definition
Typical
Value
(8400)
Typical
Value
(8500/
8550/8560) Actions