Xerox Phaser 8400 Service Manual page 187

Stripper Contact (Continued)
This test holds the drum stationary while the stripper solenoid is activated and released. The
drum servo error signal illustrates activation/deactivation timing and how strongly the drum was
contacted by the blade.
R# Definition
4 Release
Displacement (mpts)
5 Release Time (sec)
6 Releasing Period
(sec)
7 Releasing Amplitude
(mpts)
Drum Maintenance Contact
This test uses the drum servo error signal to indicate when the drum is contacted by the roller
blade.
R# Definition
0 Initial Contact
Position (pm motor
counts)
General Troubleshooting
Typical Typical
Value Value
(8400) (8500/
8550)
-0.75 to -4.5 to
2.2 4.5
0 to 0.09 .002 to .1
0 to .001 -0.5 to
.75
-45 to 0 -10 to 1
Typical Typical
Value Value
(8400) (8500/
8550)
Actions
Reports the static difference
between the average ya_fe
before and after the blade
disengages from the drum,
indicating the strength of the
blade/drum interaction while
pulling off the drum (see R0).
Reports the time between the
disengagement of the stripper sol
and the point when the blade
begins to withdraw from the drum
(see R2).
Reports the time between the
disengagement of the stripper sol
and the point when the reaction
of the drum to the withdrawal of
the blade fades back into the
ripple (see R2).
Reports the magnitude of the
reaction of the drum to the blade
withdrawal (see R3).
Actions
Reports the distance the pm
motor was moved (raising the dm
unit), before a Y-axis reaction was
detected. Shows that the dm is
raising, provides blade/drum gap
information.
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