Xerox Phaser 8860 Service Manual page 248

Table 33 Y-Axis Encoder Nominal Values
R# Characteristic Typical Value
9 Cosine peak-to-peak average N/A
amplitude (cosine sum units)
Y-Axis Geometry Test
This test measures the dynamic stability of the Y-axis drive system. The test rotates the Drum
at a constant velocity and measures Drum and Y-Axis Motor vibration. A very high motor or
drum peak indicates that the component is unbalanced.
Table 34 Y-Axis Geometry Nominal Values
R# Characteristic Typical Value
0 Drum FFT Power (none) N/A
1 Drum Frequency (hz) N/A
2 Motor FFT Power Ratio N/A
(none)
3 Motor Frequency (hz) N/A
4 FFT Power Ratio 1 (none) N/A
5 Frequency 1 Frequency (hz) N/A
6 FFT Power Ratio 2 (none) N/A
7 Frequency 2 Frequency (hz) N/A
Diagnostics
Print Engine Check Menu Tests
Result
Reports sum of the absolute values of
the average of the Cosine Sum positive
peak values and the average of the
Cosine Sum negative peak values.
Result
Reports the rescaled FFT power ampli-
tude of the drum frequency.
Reports the current drum frequency.
Reports the ratio of the FFT power
amplitude of the motor frequency to the
FFT power amplitude of the drum fre-
quency.
Reports the current motor frequency.
Reports the ratio of the FFT power
amplitude of the most powerful FFT fre-
quency (not including the drum or
motor), to the FFT power amplitude of
the drum frequency.
Reports the frequency of the most pow-
erful 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 includ-
ing the drum or motor).
Y-Axis Drive Test
This test checks the dynamic performance of the Y-Axis servo control loop. The test is per-
formed with and without the Transfix Roller loaded on the Drum (i.e. min and max loads). Servo
response parameters under various conditions covering anticipated usage ranges are mea-
sured. Excessive velocity ripple could result in image quality problems due to variations in Y-
Axis pixel placement. Excessive settling times can reduce throughput or result in leading edge
print artifacts.
Table 35 Y-Axis Drive Nominal Values
R# Characteristic
0 HAHVN CCW Average fe
(mpts)
1 HAHVN CCW fe Ripple
(mpts)
2 HAHVN CW Average fe
(mpts)
3 HAHVN CW fe Ripple (mpts) N/A
4 HAHVN Start fe Settle time
(sec)
5 HAHVN Reverse Fe Settle
time (sec)
6 HAHVN Stop Fe Settle time
(sec)
7 HAHVN Delta Print Velocity
Settle Time (sec)
8 HAHVN Speed/Voltage Ratio
(in/sec/volt)
9 HALVN Speed/Voltage Ratio
(in/sec/volt)
09/2007
6-28
Typical Value Result
N/A Reports average following error (fe) dur-
ing the last half of the first steady state
period.
N/A Reports following error ripple during the
last half of the first steady state period.
N/A Reports average following error during
the last half of the second steady state
period.
Reports following error ripple during the
last half of the second steady state
period.
N/A Reports the time following the start of
motion that it takes the following error
value to enter the CCW ripple band.
N/A Reports the time following the start of
motion reversing that it takes the follow-
ing error value to enter the CW ripple
band.
N/A Reports the time following the start of
motion stopping that it takes the following
error value to enter the idle ripple band.
N/A Reports the time following the start of
motion that it takes the Y-axis delta
velocity to enter the CCW delta velocity
ripple band.
N/A Reports an approximation of the motor
Ke parameter during high speed opera-
tion.
N/A Reports an approximation of the motor
Ke parameter during low speed opera-
tion.
Phaser 8860/8860MFP Service Manual
Initial Issue