Xerox Phaser 8400 Service Manual page 158

Y-axis Encoder (Continued)
Uses the sine and cosine sum data to determine the characteristics of the encoder disk and
encoder sensors.
R# Definition
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.
R# Definition
0 Drum Normalized
FFT Power (none)
1 Drum Frequency
(hz)
2 Motor FFT Power
Ratio (none)
3 Motor Frequency
(hz)
4 FFT Power Ratio 1
(none)
5 Frequency 1
Frequency (hz)
6 FFT Power Ratio 2
(none)
4-38
Typical
Value Actions
25 to 75 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.
-140000 Reports the max variation in the reported delta
to 275000 position between samples over the revolution.
Typical
Value 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.
Reports the current motor frequency.
Reports the ratio of the FFT power amplitude
of the most powerful FFT frequency (not
including the drum or motor), to the FFT power
amplitude of the drum frequency.
Reports the frequency of the most powerful
FFT frequency (not including the drum or
motor).
Reports the ratio of the FFT power amplitude
of the second most powerful FFT frequency
(not including the drum or motor), to the FFT
power amplitude of the drum frequency.
Phaser 8400 Color Printer