Xerox Phaser 8500, Service Manual

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4-18 Phaser 8400/8500/8550/8560 Color Printer Service Manual
General Troubleshooting
Runs the Media Path Drive train and engages the Tray 1 Pick SAolenoid on
the fly. The Pick Shaft goes through two full revolutions while drive
requirements are determined.
9 CW On average fe. -50 to 15 .02 to .2 Reports the average effort
required to rotate the wiper
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).
10 CW On fe ripple. 20 to 75 0 to .4 Reports the variation of effort
needed to rotate the wiper
shaft in the CW direction at a
constant velocity.
A larger value may show
particles in the gears or non
uniform contamination of a
roller (causing a lump).
11 CW Off fe settling
time (sec). -5 to .01 .02 to .22 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 could indicate a
dragging or slow to release
clutch.
Tray 1 Pick Shaft
R# Definition
Typical
Value
(8400) Typical
Value
(8500/
8550/8560) Actions
0 Off average MP fe.
(mpts). 800 to 1500 Reports the average MP fe
during the run in interval
before the pick shaft is
engaged.
Wiper Shaft (Continued)
R# Definition
Typical
Value
(8400)
Typical
Value
(8500/
8550/8560) Actions