Xerox Phaser 8500 Service Manual

Phaser 8400/8500/8550/8560 Color Printer Service Manual 4-37
General Troubleshooting
Check Drum Menu
Uses the sine and cosine sum data to determine the characteristics of the
encoder disk and encoder sensors.
Y-Axis Encoder
R# Definition
Typical
Value
(8400)
Typical
Value (8500/
8550/8560)
Actions
0 Sin Sum Data
Offset (sin sum
units)
150000 to
800000
-68000 to
160000
Reports average of the max
and min Sin Sum average
amplitude values.
1 Sin Sum Data
Amplitude (sin sum
units)
-11000 to
350000
-68000 to
160000
Reports difference between the
max and min Sin Sum average
amplitude values.
2 Amplitude Ripple
(Sun Sum units)
25 to 75 2.0 to 12 Reports the ripple in the Sin
Sum amplitude values.
Excludes the neighborhood of
the Home notch (a distance of
+/- 50 samples from the Home
notch min location.
3 Max Position
Ripple (mpts)
-140000 to
275000
24000 to
52000
Reports the max variation in
the reported delta position
between samples over the
revolution.
4 Sin max delta
position
-.3 to 5 -.3 to 5 Reports the max value of the
diference between the rotation
position of any adjacent sin
sum peaks
5 Home Notch Depth
Ratio (none)
0 to 13 68 to 80 Reports the ratio between the
notch bottom amplitude and
the max amplitude value as
reflected in the Sin Sum data.
6 Home Notch Width
(sec)
50 to 90 720 to 960 Reports the width of the Home
notch at 99% full depth as
reflected in the Sin Sum data.
7 Home Notch
Symmetry (none)
250 to 550 35 to 65 Reports the ratio of the Home
notch width sections as
bisected by a vertical from the
notch min as reflected in the
Sin Sum data.
8 Cosine Sum Data
Offset (cosine sum
units)
90000 to
450000
-125000 to
200000
Reports average of the max
and min Cosine Sum average
amplitude values.
9 Cosine Sum Data
Amplitude (cosine
sum units)
300000 to
500000
300000 to
500000
Reports difference between the
max and min Cosine Sum
average amplitude values.

Xerox Phaser 8500 Specifications

General

Brand	Xerox
Model	Phaser 8500
Category	Printer
Language	English