Xerox Phaser 8400 Service Manual

General Troubleshooting 4-55
8 Ink Melt 4 Temp
~50
o
~50
o
Black (usually off)
Purge Pump
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
0 Jetstack
Temperature (deg)
~134
o
~138
o
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.
1 Start Power (watts) Reports initial peak pumping
power after pump power on. This
reflects the inrush current to the
pump motor. An unusual value
could indicate a defective motor
(windings/brushes/etc.).
2 Initial Pumping
Power (watts)
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
Temperature Status (Continued)
This test scans the thermocouples and reports data on the current temperature with the goal of
providing a picture of the current temperature state of the printer. All degrees are reported in
celsius.
R# Definition
Typical
Value
(8400)
Typical
Value
(8500/
8550) Actions

Xerox Phaser 8400 Specifications

General

Brand	Xerox
Model	Phaser 8400
Category	Printer
Language	English