Xerox Phaser 8400 Service Manual page 208

Electronics Troubleshooting Guide
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
Plug in the Printhead connector ('CE' /
J130) in the Electronics Module
Turn on power to the printer
If the PE and PS indicators do not flash,
the short is on the Printhead. Replace
the Printhead and retest the printer. Skip
the rest of this section if the PE and PS
indicators flash because the problem is
elsewhere in the printer.
Plug in all cables removed during service
Attach printer covers
Perform full test of printer
General Troubleshooting
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
This step adds the
Control Panel back to
a working Electronics
Module and I/O
board in order to see
if the short circuit is
also removed
Carefully test the
printer to ensure
damage to the
Electronics Module
did not occur due to
the shorted
Printhead
* Possible solution to
problem *
Trace through all
service steps
performed to
reattach any cables
that were unplugged
during debugging
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