Xerox PHASER 8500 Service Manual page 170

General Troubleshooting
4-40
This test does a chase using a special sheet of preprinted media and records
the y-axis following error.
Y-Axis Belt Slip
Typical
Value
R# Definition (8400)
0 Initial Peak Y-Axis 0 to 12000 1200 to 8000 Reports the amplitude of the
FE (mpts)
1 Max Following 0 to 11000 1100 to 7500 Reports the amplitude of the
Peak Y-Axis FE
(mpts)
2 Average Y-Axis FE 0 to 4000
(mpts)
This test modifies the Y-Axis servo loop so that it is unstable and oscillates.
The oscillation frequency is recorded while the drum is advanced for two
revolutions. Checks for correct belt tension and variations in tension during
operation.
Y-Axis Belt Tension
Typical
Value
R# Definition (8400)
0 Min Resonant 10 to 150
Frequency (hz)
1 Max Resonant 175 to
Frequency (hz) 3000
2 Min Resonant
Frequency Revs
(revs)
3 Min Resonant -0.001 to -
Frequency Angle 0.2
(deg)
Typical
Value (8500/
8550/8560)
2200 to 3500 Reports the average of the Y-
Typical
Value (8500/
8550/8560)
4.5 to 175
-4400 to
10000
-33 to -20
Phaser 8400/8500/8550/8560 Color Printer Service Manual
Actions
first Y-Axis following error
peak.
maximum Y-Axis FE peak after
the first.
Axis following error during the
roller down portion of the
transfix operation.
Actions
Reports the min resonant
frequency over the data set.
Reports the max resonant
frequency over the data set.
Reports the number of full Y-
Axis revs required to locate the
min frequency configuration.
Reports the amount of
additional Y-Axis rotation
required to locate the min
frequency configuration.