Xerox Phaser 8560MFP Service Documentation page 220

Table 12 Tray 1 Pick Shaft Nominal Values
R# Characteristic Typical Value
1 On response time. (sec) N/A
2 Average Media Drive fe N/A
3 Transition Media Drive fe min. N/A
(mpts)
4 Contact average fe N/A
5 Pushdown MP fe max N/A
6 Final average MP fe. (mpts) N/A
Diagnostics
Print Engine Check Menu Tests
Result
Reports the time between Pick Solenoid
activation and a detectable response
from the Media Drive Assembly indicat-
ing pick shaft engagement. A higher
value of R1 could indicate that the pick
shaft 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 followers, drag on the pick shaft, or
problems with the drive gears (missing
teeth, etc.).
Reports the average Media Drive fe
immediately following pick shaft engage-
ment.
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 ten-
sion or higher shaft bearing drag. Also, if
the pick shaft gear did not engage, this
value is unchanged from R0.
Reports the minimum MP fe value at the
transition point between breaking sepa-
rator 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.
Reports the average Media Drive fe
while the Pick Roller is contacting the
Separator Pad. This value reflects fric-
tion between the Separator Pad and the
Pick Roller. This value may be effected
by contamination or glazing.
Reports the peak MP fe during the inter-
val when the pick cams are depressing
the lift plate A higher value here could
indicate issues with the cam surfaces or
the spring compression force.
Reports the average Media Drive fe fol-
lowing the latching of the pick shaft gear.
This value should be the same as R0 if
the pick shaft gear successfully latched.
10/2006
Tray 2, 3, or 4 Pick Shaft Test
This test determines if the specified tray pick shaft is operating normally. The test is the same
for each pick shaft, although for Tray 2, the Media Drive Assembly is used instead of the
optional Tray Motor. Requesting a test for a missing tray generates an "option not detected"
message and the test does not run. This test checks Pick Clutch, Nudger Roller, and Separator
Pad performance, although information is obtained about bearing, gear and shaft condition.
At the start of the test, a prompt requests removal of any media, if present, in the tray (if initially
empty, cycle the tray to leave the lift plate in the down position). Acknowledge the prompt by
pressing a Control Panel key. After acknowledgement, the pick shaft is driven for a short time to
loosen up the gears and bearings. Next, the Tray Motor is run for a short time with the pick
shaft disengaged. The pick clutch is momentarily engaged and the Tray Motor stopped. The
test continues by running the pick shaft at a slow pick speed. At the same time, the correspond-
ing lift plate is raised. The raising operation terminates when the Paper Height Sensor goes
High. The pick shaft continues to run for a short time to determine the amount of friction
between the Nudger Roller and the Separator Pad. The system response to the Pick Clutch
activity demonstrates the clutch characteristics. The steady state drive requirements should
show bearing status and the characteristics of the roller materials, flat/dirty rollers, bent shafts,
etc. Nudger Roller and Separator Pad friction indicates condition of these parts (glazed, dirty).
Table 13 Tray 2, 3, or 4 Pick Shaft Nominal Values
R# Characteristic
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
6-18
Typical Value Result
N/A Reports a time that indicates how long it
takes the Media Drive Assembly servo
system to react to the sudden addition of
the pick shaft load. Larger values may
indicate a slipping or slow to engage
clutch.
N/A Reports the peak effort required to accel-
erate the pick shaft load. A smaller value
could indicate a slipping clutch.
N/A Reports the time it takes the MP motor
servo system to settle down after the
sudden addition of the pick shaft load.
A longer time could indicate looseness in
the pick shaft or a slipping clutch.
N/A Reports the average effort needed to
rotate the pick shaft in the pick direction
at a constant velocity. An unusual value
could indicate a binding shaft, missing
pressure springs, hard/dirty rollers, or
excessive friction.
N/A Reports the variation of effort required to
rotate the 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).
Phaser 8510/8560MFP Multifunction Product
Initial Issue