Xerox 8500DN Service Manual - Page 171

General Troubleshooting This test holds the drum stationary while the stripper solenoid is activated and released. The drum servo error signal illustrates activation/deactivation timing and how strongly the drum was contacted by the blade. Stripper Contact R# Definition 0 Engage Displacement (mpts) Typical Value (8400) -10 to 2 1 Engage Time (sec) .0030 to .0035 2 Engaging Period (sec) 0 to 0.11 3 Engaging 3 to 18 Amplitude (mpts) Typical Value (8500/ 8550/8560) Actions -15 to 8.0 0 to .05 0 to .3 5.0 to 35 Reports the static difference between the average ya_fe before and after the blade contacts the drum, indicating how strongly the blade is interacting with the drum while pushing onto the drum. May be an indication as to the condition of the blade (stiffness, dirty, bent, delaminated, etc.). Another potential factor could be the solenoid range of travel or engagement force (solenoid/ solenoid drive strength or return spring strength). Reports time between engagement of the stripper solenoid and initial contact between the blade and the drum. May indicate the geometry of the mechanism, such as parts out of tolerance, misassembled, or bent, causing an incorrect blade to drum gap. Reports time between stripper solenoid engagement and the point when the reaction of the drum to the contact of the blade fades back into the ripple (noise). Another indication of blade to drum interaction. The profile shape (R2/R2) could be a dynamic indication of the blade/drum interaction as is the static value reported by R0. Reports the magnitude of the reaction of the drum to the contact of the blade. (See R2) Phaser 8400/8500/8550/8560 Color Printer Service Manual 4-41