Lexmark T420 User Reference page 115

Activating menu changes, Performing self test, or
Restoring factory defaults
What this light sequence means:
• The printer is activating changes made to the printer menu
settings or values.
• The printer is performing a self test.
• The printer is restoring the factory default printer settings. All
downloaded resources (fonts, macros, symbol sets) in printer
memory will be deleted.
What you can do:
• Activating menu changes: Wait for the message to clear.
• Self test: Wait as the printer powers on and enters the Ready
state as shown by the Ready/Data light being on.
• Restoring factory defaults: Wait for the message to clear.
Invalid network code
What this light sequence means:
The code in the internal print server has not been programmed or
the programmed code is invalid.
What you can do:
Download valid network code. The Ready or Busy message will not
return until valid network code is downloaded.
Warning: Do not turn the printer off while this message is
displayed.
All lights on the operator panel
cycle (lights blink in sequence
one at a time from the top to the
bottom, and then the cycle starts
again).
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