Xerox 8500DN Service Manual - Page 165

General Troubleshooting Drum Maintenance Drive (Continued) R# Definition Typical Value (8400) Typical Value (8500/ 8550/8560) Actions 4 Roller Average Period (sec) 50 to 1600 -.05 to .05 Reports the average period of the Y-Axis following error ripple during the Roll With Both Loaded interval. This variation would be due to the dmu roller rolling along the drum surface. 5 Roller Revs 3 to 40 Reports the number of Y-Axis following error ripple peaks during the Roll With Both Loaded interval. 6 Roller Disengaged -0.001 to -.05 to 0.5 Time (sec) 0.05 Reports the time from the unload roller command to the engine until the drum indicates no further roller contact. 7 Blade loaded average Y-Axis following error (mpts) -160 to -50 -800 to -100 Reports the average Y-Axis following error during the Roll With Blade Loaded interval. 8 Blade loaded Y- -0.001 to 115 to 900 Reports the difference Axis following error 0.50 between the max and the min ripple (mpts) Y-Axis following error during the Roll With Blade Loaded interval. 9 Blade Disengaged Time (sec) -0.05 to 0.05 Reports the time from the unload blade command to the engine until the drum indicates no further blade contact. This test drives the Printhead tilt mechanism through one cycle to determine if it is controllable and operating as expected. Tilt Drive R# Definition 0 Tilt Engage Cap Position (min) 1 Pre Standby Peak Location () Typical Value (8400) Typical Value (8500/ 8550/8560) Actions 10 to 600 50 to 550 Reports the distance from the cap Home position to the tilt cam engage point. 325 to 3100 -125 to 10 Reports the distance around the tilt cam from the tilt engage position to the pre standby peak. Phaser 8400/8500/8550/8560 Color Printer Service Manual 4-35