Xerox Phaser 8400 Service Manual page 195

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
8 Ink Melt 4 Temp
Purge Pump
This test determines if the purge pump system (pump/hose/purge valve/printhead) is operating
normally.
R# Definition
0 Jetstack
Temperature (deg)
1 Start Power (watts)
2 Initial Pumping
Power (watts)
General Troubleshooting
Typical Typical
Value Value
(8400) (8500/
8550)
o o
~50 ~50
Typical Typical
Value Value
(8400) (8500/
8550)
o o
~134 ~138
Actions
Black (usually off)
Actions
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 inrush 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
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