Xerox C2424 Service Manual - Page 179

Wiper Shaft (Continued) 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. R# Definition Typical Value Actions 9 CW On average fe. -50 to 15 Reports the average effort required to rotate the wiper shaft in the CW 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). 10 CW On fe ripple. 0 to 70 Reports the variation of effort needed to rotate the wiper shaft in the CW direction at a constant velocity. A larger value may show particles in the gears or non uniform contamination of a roller (causing a lump) 11 CW Off fe settling time (sec). -5 to 0.01 Reports the time it takes the MP motor servo system to "settle down" after the sudden release of the wiper shaft load. A larger value could indicate a dragging or slow to release clutch. Tray 1 Pick Shaft Runs the media path drive train and engages the Tray 1 pick solenoid on the fly. The pick shaft goes through 2 full revolutions while drive requirements are determined. R# Definition Typical Value Actions 0 Off average MP fe. MFG (mpts). Only 1 On response time. MFG (sec). Only Reports the average MP fe during the run in interval before the pick shaft is engaged. Reports the time between pick solenoid activation and a detectable response from the MP drive system indicating that pick shaft engagement. A higher value of R1 could indicate that the missing tooth gear engaged more slowly than usual, which could be a problem with the lift plate spring tension, the condition of the sliding surfaces between the cams and the followers, drag on the pick shaft, or problems with the drive gears (missing teeth, etc.). General Troubleshooting 4-21