Xerox Phaser 8860 Service Manual page 249

Y-Axis Drive Belt Slippage Test
This test does a chase (pick/transfix), of a special sheet of preprinted media and records the
Y-axis following error (fe).
Table 36 Y-Axis Drive Belt Slippage Nominal Values
R# Characteristic Typical Value
0 Initial Peak Y-axis fe (mpts) N/A
1 Maximum Peak Y-axis fe N/A
(mpts)
2 Average Y-axis fe (mpts) N/A
Y-Axis Drive Belt Tension Test
This test checks for proper belt tension by modifying the Y-Axis servo loop so it is unstable and
oscillates. After a run in period to loosen the belt, the drum is advanced for two revolutions and
the oscillation frequency is recorded. Drive component runouts and tolerances can cause the
belt tension to change as the Drum turns. Higher frequency variations are typically the motor
pulley. While lower frequency variations are the drum pulley. Dirt, debris, or defects may also
cause tension variations.
Table 37 Y-Axis Drive Belt Tension Nominal Values
R# Characteristic Typical Value
0 Min Resonant Frequency N/A
(hz)
1 Max Resonant Frequency N/A
(hz)
2 Min Resonant Frequency N/A
Revs (revs)
3 Min Resonant Frequency N/A
Angle (deg)
Stripper Contact Test
This test exercises the stripper blade. The Drum is held stationary and the Stripper Solenoid is
activated and released. The reaction of the Drum servo error signal indicates activation timing
and how strongly the Drum was contacted by the stripper blade. The contract pressure on the
drum may relate to stripper blade geometry and condition. The test requires the doors be
closed and the upper paper path to be clear.
Initial Issue
Phaser 8860/8860MFP Service Manual
Result
Reports the amplitude of the first Y-axis
following error peak.
Reports the amplitude of the maximum
Y-axis fe peak after the first.
Reports the average of the Y-axis follow-
ing error during the roller down portion of
the transfix operation.
Result
Reports the min resonant frequency over
the data set.
Reports the max resonant frequency
over the data set.
Reports the number of full Y-Axis rota-
tions required to locate the min fre-
quency configuration.
Reports the amount of additional Y-Axis
rotations required to locate the min fre-
quency configuration.
Zero or too small readings for all of the engage/release values indicate that the stripper blade
did not contact the Drum. A minimal bump could occur if the solenoid plunger activated, but
there was no stripper mechanism motion, possibly due to the stripper blade being in the
latched up position. The test does not prepare the Drum with a drum maintenance cycle. The
condition of the Drum (too much oil, not enough oil, ink residue, or dirt), may affect results.
Table 38 Stripper Contact Nominal Values
R# Characteristic
0 Engage Displacement (mpts) N/A
1 Engage Time (sec)
2 Engaging Period (sec)
3 Engaging Amplitude (mpts)
4 Release Displacement
(mpts)
5 Release Time (sec)
6 Releasing Time (sec)
09/2007
6-29
Typical Value Result
Reports the static difference between the
average Y-Axis following error before and
after the blade has engaged the Drum,
indicating how strongly the blade is inter-
acting with the drum while pushing onto
the drum. Unusual values may indicate
blade condition (stiffness, dirty, bent,
delaminated, etc.). Another potential
contributor is the solenoid's range of
travel or engagement force (solenoid/
solenoid drive strength or return spring
strength, including a missing or double
spring).
N/A Reports the time between the engage-
ment of the Stripper Solenoid and the
blade begins to contact the Drum.
Unusual values may indicate the geome-
try of the mechanism (i.e. parts out of tol-
erance, bent, missing, etc.), causing an
incorrect blade to Drum gap.
N/A Reports the time between the engage-
ment of the Stripper Solenoid and the
reaction of the Drum servo error signal
fades back into the ripple (noise).
N/A Reports the magnitude of the reaction of
the drum to the contact of the blade.
N/A Reports the static difference between the
average Y-Axis following error before and
after the blade has disengaged from the
drum.
N/A Reports the time between the disen-
gagement of the Stripper Solenoid and
the blade begins to withdraw from the
Drum. See R2.
N/A Reports the time between the disen-
gagement of the Stripper Solenoid and
the reaction of the drum to the with-
drawal of the blade fades back into the
ripple. See R2.
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