Xerox Phaser 8400 Service Manual

General Troubleshooting 4-45
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
Typical
Value
(8400)
Typical
Value
(8500/
8550) Actions
0 Initial Peak Y-axis
FE (mpts)
0 to
12000
1200 to
8000
Reports the amplitude of the first
Y-axis following error peak.
1 Max Following Peak
Y-axis FE (mpts)
0 to
11000
1100 to
7500
Reports the amplitude of the
maximum Y-axis FE peak after
the first.
2 Average Y-axis FE
(mpts)
0 to 4000 2200 to
3500
Reports the average of the Y-axis
following error during the roller
down portion of the transfix
operation.
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
Typical
Value
(8400)
Typical
Value
(8500/
8550) Actions
0 Min Resonant
Frequency (hz)
10 to 150 4.5 to 175 Reports the min resonant
frequency over the data set.
1 Max Resonant
Frequency (hz)
175 to
3000
-4400 to
10000
Reports the max resonant
frequency over the data set.
2 Min Resonant
Frequency Revs
(revs)
Reports the number of full Y-axis
revs required to locate the min
frequency configuration.
3 Min Resonant
Frequency Angle
(deg)
-0.001 to
-0.2
-33 to -20 Reports the amount of additional
Y-axis rotation required to locate
the min frequency configuration.

Xerox Phaser 8400 Specifications

General

Brand	Xerox
Model	Phaser 8400
Category	Printer
Language	English