Xerox 8500DN Service Manual - Page 146

General Troubleshooting Check Paper Path Menu Runs the Media Path Drive train and engages the Head Maintenance Clutch on the fly then disengages the clutch. The test is repeated in both directions to determine clutch characteristics, steady state drive requirements, bearing status, etc. Wiper Shaft R# Definition Typical Value (8400) Typical Value (8500/ 8550/8560) Actions 0 Time to CCW On peak fe (sec). 0.009 to 0.16 .02 to 1.0 Reports how long it takes the MP motor servo system to react to the sudden addition of the wiper shaft load. Larger values may indicate a slipping or slow to engage clutch. 1 CCW On peak fe. 25 to 100 .015 to 1.4 Reports the peak effort required to accelerate the wiper shaft load. A smaller value could indicate a slipping clutch. 2 CCW On fe settling -2.1 to 0.25 -.03 to .3 time (sec). Reports the time it takes the MP motor servo system to "settle down" following the sudden addition of the wiper shaft load. A longer time could indicate a looseness in the wiper shaft assembly or a slipping clutch. 3 CCW On average fe. 10 to 50 -.1 to 0 Reports the average effort required to rotate the wiper shaft in the CCW direction at a constant velocity. An unusual value could indicate a difference in the composition and/or number of the rollers, the nip pressure, or out of range mechanical dimensions due to wear or contamination (such as paper dust increasing the effective diameter of a roller). 4-16 Phaser 8400/8500/8550/8560 Color Printer Service Manual