Xerox Phaser 8400 Service Manual page 173

Check Menu Value Key Table (Continued)
3 Cosine Sum
Data Offset
(cosine sum
units)
4 Home Notch
Depth Ratio
(none)
5 Home Notch
Width (sec)
6 Home Notch
Symmetry
(none)
7 Amplitude Ripple
(Sun Sum units)
8 Max Position
Ripple (mpts)
Y-axis Geometry - Rotates the drum at a constant velocity and samples the Y-axis position.
Uses the data to determine Y-axis motor and drum vibration and the most significant other
vibrational frequencies.
Test ID# R Definition
#
Y-axis Geometry 0 Drum
Normalized FFT
Power (none)
1 Drum Frequency
(hz)
2 Motor FFT
Power Ratio
(none)
4-28
Reports average of the max and
min Cosine Sum average
amplitude values.
Reports the ratio between the
notch bottom amplitude and the
max amplitude value as
reflected in the Sin Sum data.
Reports the width of the Home
notch at 99% full depth as
reflected in the Sin Sum data.
Reports the ratio of the Home
notch width sections as bisected
by a vertical from the notch min
as reflected in the Sin Sum
data.
Reports the ripple in the Sin
Sum amplitude values.
Excludes the neighborhood of
the Home notch (a distance of
+/- 50 samples from the Home
notch min location.
Reports the max variation in the
reported delta position between
samples over the revolution.
Results Interpretation/Actions
Reports the normalized FFT
power amplitude of the drum
frequency. The normalized
value is generated by dividing
the drum FFT power by
1.0xE13.
Reports the current drum
frequency.
Reports the ration of the FFT
power amplitude of the motor
frequency to the FFT power
amplitude of the drum
frequency.
Phaser 8400 Printer Service Manual