Xerox C2424 Service Manual - Page 209

Purge Pump This test determines if the purge pump system (pump/hose/purge valve/printhead) is operating normally. R# Definition Typical Value Actions 0 Jetstack MFG Temperature (deg) Only 1 Start Power (watts) MFG Only 2 Initial Pumping Power (watts) MFG Only 3 Max Pressure Pumping Power MFG Only 4 Pumping Time To Max (sec) MFG Only 5 No Pressure Pumping Power (watts) 6 Pressure Decay Time (sec) MFG Only MFG Only Reports current jetstack temperature. If the temperature is above current threshold (120 deg), the test will abort and following results will report as 0. This avoids having ink extrude out of the faceplate and onto the drum, requiring both a wipe and a chase to clean up. Reports initial peak pumping power after pump power on. This reflects the in rush current to the pump motor. An unusual value could indicate a defective motor (windings/brushes/ etc.). 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.). General Troubleshooting 4-51