Xerox Phaser 8400 Service Manual page 185

Y-axis Belt Slip
This test does a chase using a special sheet of preprinted media and records the y-axis following
error.
R# Definition
0 Initial Peak Y-axis
FE (mpts)
1 Max Following Peak
Y-axis FE (mpts)
2 Average Y-axis FE
(mpts)
Y-axis Belt Tension
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 for variations in tension during operation.
R# Definition
0 Min Resonant
Frequency (hz)
1 Max Resonant
Frequency (hz)
2 Min Resonant
Frequency Revs
(revs)
3 Min Resonant
Frequency Angle
(deg)
General Troubleshooting
Typical Typical
Value Value
(8400) (8500/
8550)
0 to 1200 to
12000 8000
0 to 1100 to
11000 7500
0 to 4000 2200 to
3500
Typical Typical
Value Value
(8400) (8500/
8550)
10 to 150 4.5 to 175
175 to -4400 to
3000 10000
-0.001 to -33 to -20
-0.2
Actions
Reports the amplitude of the first
Y-axis following error peak.
Reports the amplitude of the
maximum Y-axis FE peak after
the first.
Reports the average of the Y-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.
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