Xerox Phaser 8400 Service Manual page 164

Tray 2, Tray 3, and Tray 4 Pick Shaft
Test is the same for each pick shaft although for tray 2 the media path motor is used and for the
525-sheet feeders the corresponding pick/transport motor is used. Test determines if the shaft
can be driven by the clutch, if the nudger rollers are being driven, and the pick pad/nudger roller
friction.
R# Definition
0 Time to On peak fe
(sec).
1 On peak fe.
2 On fe settling time
(sec).
3 On average fe.
4 On fe ripple.
5 Off fe settling time
(sec).
4-24
Typical Typical
Value Value
(8400) (8500/
8550)
Phaser 8400/8500/8550 Color Printer
Actions
Reports how long it takes the MP
motor servo system to react to
the sudden addition of the Tray 2
pick shaft load. Larger values
may indicate a slipping or slow to
engage clutch.
Reports the peak effort required
to accelerate the Tray 2 pick
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 Tray 2 pick shaft load.
A longer time could indicate
looseness in the Tray 2 pick shaft
assembly or a slipping clutch.
Reports the average effort
needed to rotate the Tray 2 pick
shaft in the pick direction at a
constant velocity. An unusual
value could indicate a binding
shaft, missing pressure springs,
hard/dirty rollers, extra friction in
the pick truck assembly.
Reports the variation of effort
required to rotate the Tray 2 pick
shaft in the pick direction at a
constant velocity. A larger value
could indicate particles in the
gears or non uniform
contamination of a roller (causing
a lump).
Reports the time it takes the MP
motor servo system to "settle
down" after the sudden release
of the Tray 2 pick shaft load.
A larger value could indicate a
dragging or slow to release
clutch.