Xerox 8500DN Service Manual - Page 170

General Troubleshooting This test does a chase using a special sheet of preprinted media and records the y-axis following error. Y-Axis Belt Slip R# Definition Typical Value (8400) Typical Value (8500/ 8550/8560) Actions 0 Initial Peak Y-Axis 0 to 12000 1200 to 8000 Reports the amplitude of the FE (mpts) first Y-Axis following error peak. 1 Max Following Peak Y-Axis FE (mpts) 0 to 11000 1100 to 7500 Reports the amplitude of the maximum Y-Axis FE peak after the first. 2 Average Y-Axis FE 0 to 4000 2200 to 3500 Reports the average of the Y- (mpts) Axis following error during the roller down portion of the transfix operation. This test modifies the Y-Axis servo loop so that it is unstable and oscillates. The oscillation frequency is recorded while the drum is advanced for two revolutions. Checks for correct belt tension and variations in tension during operation. Y-Axis Belt Tension R# Definition 0 Min Resonant Frequency (hz) 1 Max Resonant Frequency (hz) 2 Min Resonant Frequency Revs (revs) 3 Min Resonant Frequency Angle (deg) Typical Value (8400) Typical Value (8500/ 8550/8560) Actions 10 to 150 4.5 to 175 175 to 3000 -4400 to 10000 -0.001 to - -33 to -20 0.2 Reports the min resonant frequency over the data set. Reports the max resonant frequency over the data set. Reports the number of full YAxis revs required to locate the min frequency configuration. Reports the amount of additional Y-Axis rotation required to locate the min frequency configuration. 4-40 Phaser 8400/8500/8550/8560 Color Printer Service Manual