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4-42 Phaser 8400/8500/8550/8560 Color Printer Service Manual
General Troubleshooting
This test uses the drum servo error signal to indicate when the drum is
contacted by the roller blade.
4 Release
Displacement
(mpts)
-0.75 to
2.2
-4.5 to 4.5 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).
5 Release Time (sec) 0 to 0.09 .002 to .1 Reports the time between the
disengagement of the stripper
sol and the point when the
blade begins to withdraw from
the drum (see R2).
6 Releasing Period
(sec)
0 to .001 -0.5 to .75 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).
7 Releasing
Amplitude (mpts)
-45 to 0 -10 to 1 Reports the magnitude of the
reaction of the drum to the
blade withdrawal (see R3).
Drum Maintenance Contact
R# Definition
Typical
Value
(8400)
Typical
Value (8500/
8550/8560)
Actions
0 Initial Contact
Position (pm motor
counts)
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.
Stripper Contact (Continued)
R# Definition
Typical
Value
(8400)
Typical
Value (8500/
8550/8560) Actions