Xerox PHASER 8500 Service Manual page 149

Phaser 8400/8500/8550/8560 Color Printer Service Manual
Tray 1 Pick Shaft (Continued)
R# Definition
1 On response time.
(sec).
2 Initial average MP
fe. (mpts).
3 Transition MP fe
min. (mpts).
Typical Typical
Value Value
(8400) (8500/
8550/8560) Actions
-1.5 to 0.95
-1 to 1400
750 to 1800
General Troubleshooting
Reports the time between pick
solenoid activation and a
detectable response from the
MP drive system indicating
that pick shaft engagement. A
higher value of R1 could
indicate that the missing tooth
gear engaged more slowly
than usual, which could be a
problem with the lift plate
spring tension, the condition
of the sliding surfaces
between the cams and the
followers, drag on the pick
shaft, or problems with the
drive gears (missing teeth,
etc.).
Reports the average MP fe
immediately following the pick
shaft engagement.
A higher value of R2 could
indicate extra friction between
the cams and the lift plate
followers (wear,
contamination, etc.), as well
as high lift plate spring tension
or higher shaft bearing drag.
Also, if the missing tooth gear
did not kick forward and
engage, this value would be
unchanged from R0.
Reports the minimum MP fe
value at the transition point
between breaking separator
pad contact and the continued
depression of the lift plate.
Value reflects the effort
needed to rotate the pick shaft
and compress the lift spring. A
higher value of R3 could show
higher cam/bearing friction
and/or lift plate spring
strength.
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