Xerox Phaser 8400 Service Manual page 209

Electronics Troubleshooting Guide
Printer Electrostatic If the printer is currently powered on and
is on Discharge frozen, open then close the front door of
and the printer and see if the LCD responds
can
print If printer appears functional after
pages, operating the door, advise client that
but failure may have been due to an ESD
Control event. Thoroughly test printer for any
Panel other problems.
appear
s Skip the rest of this section if printer now
frozen appears functional, otherwise continue
and no debugging.
error
messa
ges are
display
ed
With power cord connected, touch the
metal Electronics Module to discharge
any static electricity.
Turn off printer and wait 30 seconds for
power supply capacitors to discharge
Unplug power cord and remove printer's
covers
Examine printer for loose grounding
connections, especially the ground strap
on the Y-axis motor
Plug in all cables removed during service
4-64
Opening and closing
the front door of the
printer causes a
reset of the entire
Control Panel
* Possible solution to
problem *
ESD damage to the
printer may occur if
static electricity is
discharged to printer
electronics
Damage to circuits
within the Electronics
Module may occur if
the power supply
capacitors are not
allowed to fully
discharge
Use caution around
motors, pulleys and
live AC connections
when working with
the printer covers off
Eliminate the
possibility of
internally generated
ESD from affecting
printer
* Possible solution to
problem *
Trace through all
service steps
performed to
reattach any cables
that were unplugged
during debugging
Phaser 8400 Printer Service Manual