Xerox 8500DN Service Manual - Page 149

General Troubleshooting Tray 1 Pick Shaft (Continued) R# Definition Typical Value (8400) Typical Value (8500/ 8550/8560) Actions 1 On response time. -1.5 to 0.95 (sec). 2 Initial average MP -1 to 1400 fe. (mpts). 3 Transition MP fe min. (mpts). 750 to 1800 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.). Reports the average MP fe immediately following the pick shaft engagement. A higher value of R2 could indicate extra friction between the cams and the lift plate followers (wear, contamination, etc.), as well as high lift plate spring tension or higher shaft bearing drag. Also, if the missing tooth gear did not kick forward and engage, this value would be unchanged from R0. Reports the minimum MP fe value at the transition point between breaking separator pad contact and the continued depression of the lift plate. Value reflects the effort needed to rotate the pick shaft and compress the lift spring. A higher value of R3 could show higher cam/bearing friction and/or lift plate spring strength. Phaser 8400/8500/8550/8560 Color Printer Service Manual 4-19