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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.