Xerox Phaser 8400 Service Manual

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

Xerox Phaser 8400 Specifications

General

Brand	Xerox
Model	Phaser 8400
Category	Printer
Language	English