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4-16 Phaser 8400/8500/8550/8560 Color Printer Service Manual
General Troubleshooting
Check Paper Path Menu
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.
Wiper Shaft
R# Definition
Typical
Value
(8400)
Typical
Value
(8500/
8550/8560)
Actions
0 Time to CCW On
peak fe (sec).
0.009 to
0.16
.02 to 1.0 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.
1 CCW On peak fe. 25 to 100 .015 to 1.4 Reports the peak effort
required to accelerate the
wiper shaft load. A smaller
value could indicate a slipping
clutch.
2 CCW On fe settling
time (sec).
-2.1 to 0.25 -.03 to .3 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.
3 CCW On average fe. 10 to 50 -.1 to 0 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).