Xerox Phaser 8400 Service Manual page 196

Purge Pump (Continued)
This test determines if the purge pump system (pump/hose/purge valve/printhead) is operating
normally.
R# Definition
3 Max Pressure
Pumping Power
4 Pumping Time To
Max (sec)
5 No Pressure
Pumping Power
(watts)
6 Pressure Decay
Time (sec)
Voltages
This test determines averaged readings for key system voltages.
R# Definition
Main Board Voltages
0 5 Volts (volts)
1 1.8 Volts (volts)
4-56
Typical Typical
Value Value
(8400) (8500/
8550)
Typical Typical
Value Value
(8400) (8500/
8550)
~5V ~5V
~1.8V ~1.8V
Phaser 8400/8500/8550 Color Printer
Actions
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.).
Actions