Xerox 8500DN Service Manual - Page 167

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