Xerox 8500DN Service Manual - Page 164

General Troubleshooting 4-34 With the drum turning at a constant velocity, the transfix roller is loaded against the drum, held for one revolution, then raised. The velocity with which the transfix roller is moved differs for the two tests. Transfix Drive Slow and Transfix Drive Fast R# Definition Typical Fast 0 Time to first 0.22 to contact (sec) 0.29 Value Slow 0.22 to 0.50 1 Loaded 2600 to average Y- 4200 Axis following error (mpts) 2600 to 3400 2 Loaded YAxis following error ripple (mpts) 75 to 1200 150 to 1100 3 Time to last .300 to contact (sec) 0.450 0.30 to 0.80 Actions Reports the time from the load command to the engine until the drum indicates contact with the pressure roller. Reports the average Y-Axis following error during the Roll With Transfix Roller Down interval. Reports the difference between the max and min Y-Axis following errors during the Roll With Transfix Roller Down interval Reports the time from the unload command to the engine until the drum indicates no further contact. With the Y-Axis rotating, the drum maintenance unit is loaded against the drum for a short time in each configuration (roller and blade/blade only). Drum Maintenance Drive R# Definition Typical Value (8400) Typical Value (8500/ 8550/8560) Actions 0 Time to blade first .01 to .35 .15 to .4 contact (sec) Reports the time from the load command to the engine until the drum indicates blade contact. 1 Time to roller first .03 to 045 .2 to .50 contact (sec) Reports the time from the load command to the engine until the drum indicates roller contact. 2 Roller/Blade loaded -700 to average Y-Axis -250 following error (mpts) -650 to -150 Reports the average Y-Axis following error during the Roll With Both Loaded interval. 3 Roller/Blade loaded -50 to 300 0 to 600 Y-Axis following error ripple (mpts) Reports the difference between the max and the min Y-Axis following error during the Roll With Both Loaded interval. Phaser 8400/8500/8550/8560 Color Printer Service Manual