Xerox 8500DN Service Manual - Page 178

General Troubleshooting Purge Pump (Continued) R# Definition 2 Initial Pumping Power (watts) Typical Value (8400) 3 Max Pressure Pumping Power 4 Pumping Time To Max (sec) 5 No Pressure Pumping Power (watts) 6 Pressure Decay Time (sec) Typical Value (8500/ 8550/8560) Actions Reports minimum pumping power after start up peak (R1). This is the first value to reflect the system pressure. If the volume is normal (hose/ printhead), then the drop is large and the pressure rises slowly. If the volume is small (hose pinched plugged near the pump), then the drop is minimal and the pressure rises quickly Reports average pumping power just before maximum pressure is reached. May indicate the efficiency of the pump, leaks, and/or the setting of the pressure relief valve. Reports the time from pump on until the pressure relief valve opens. May indicate the conditions discussed in R3, as well as the system volume. Reports the average pumping power after the pressure has fully decayed. May indicate pump motor condition/ efficiency. Reports the time between purge valve opening and the point when the pumping power (relative to the current pressure), fades back into the ripple of the no pressure pumping power (see the R5 discussion above). This time could indicate the operation of the purge valve and the condition of the bleed orifice (plugged, etc.). 4-48 Phaser 8400/8500/8550/8560 Color Printer Service Manual