Xerox 8500DN Service Manual - Page 163

General Troubleshooting This test drives the X-Axis Motor in each direction until the Printhead stalls into the stops. Next, the test moves the Printhead into the clear and performs an on the fly reversal. X-Axis Drive R# Definition Typical Value (8400) Typical Value (8500/ 8550/8560) Actions 0 Right Stall Power 5 to 10 Level (watts) .5 to 3.3 1 Left Right Distance 0.32 to (in) 0.48 -.15 to .5 2 Right Left Traverse 3.5 to 8.5 .5 to 1.55 Average Power Level (watts) 3 Right Left Traverse .20 to 1.8 -0.5 to 1.0 Power Ripple (watts) 4 Left Right Traverse 4.0 to 8.5 .5 to 1.75 Power Average Level (watts) 5 Left Right Traverse 1.2 to 1.5 -.01 to .05 Power Ripple (watts) 6 Turnaround Power Blip Width (watts) .02 to .11 Reports the motor/drive electronics stall power. An abnormal level may indicate a motor/motor drive problem. Reports the distance between the left and right stall points. An abnormal value may indicate an problem that restricts the range of motion (pinched cable, etc.). Reports the average power required to move the printhead from the right hard stop to the left hard stop. An abnormal value may indicate a problem with the lead screw or printhead bearings (lubrication, etc.). Reports ripple in the power level needed to move the printhead from the right hard stop to the left hard stop. An abnormal value may indicate a problem with roughness in the drive mechanism or an interference with the printhead motion. Same as R2 except for the other direction of motion. Same as R3 except for the other direction of. motion. Reports the width of the momentary drop in the required drive power when the printhead motion is being reversed. An abnormal value may indicate an unusual amount of play in the drive mechanism. Phaser 8400/8500/8550/8560 Color Printer Service Manual 4-33