Xerox PHASER 8500 Service Manual page 168

General Troubleshooting
4-38
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.
Y-Axis Geometry
Typical
Value
R# Definition (8400)
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)
7 Frequency 2
Frequency (hz)
Typical
Value (8500/
8550/8560)
-3900 to
6000
1.25 to 7.5
-200 to 250
44 to 48
-20000 to
25000
45 to 110
-14000 to
17000
-70 to 140
Phaser 8400/8500/8550/8560 Color Printer Service Manual
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.
Reports the frequency of the
second most powerful FFT
frequency (not including the
drum or motor).