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Phaser 8400/8500/8550/8560 Color Printer Service Manual 4-41
General Troubleshooting
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.
Stripper Contact
R# Definition
Typical
Value
(8400)
Typical
Value (8500/
8550/8560)
Actions
0 Engage
Displacement
(mpts)
-10 to 2 -15 to 8.0 Reports the static difference
between the average ya_fe
before and after the blade
contacts the drum, indicating
how strongly the blade is
interacting with the drum while
pushing onto the drum.
May be an indication as to the
condition of the blade
(stiffness, dirty, bent,
delaminated, etc.). Another
potential factor could be the
solenoid range of travel or
engagement force (solenoid/
solenoid drive strength or
return spring strength).
1 Engage Time (sec) .0030 to
.0035
0 to .05 Reports time between
engagement of the stripper
solenoid and initial contact
between the blade and the
drum.
May indicate the geometry of
the mechanism, such as parts
out of tolerance, mis-
assembled, or bent, causing an
incorrect blade to drum gap.
2 Engaging Period
(sec)
0 to 0.11 0 to .3 Reports time between stripper
solenoid engagement and the
point when the reaction of the
drum to the contact of the
blade fades back into the ripple
(noise). Another indication of
blade to drum interaction. The
profile shape (R2/R2) could be
a dynamic indication of the
blade/drum interaction as is
the static value reported by R0.
3 Engaging
Amplitude (mpts)
3 to 18 5.0 to 35 Reports the magnitude of the
reaction of the drum to the
contact of the blade. (See R2)