Paxar 9402 Reference Manual page 191

When a HARD failure (errors 900-999) occurs on the printer, the
printer displays WARNING or POWER DOWN on the top line of
the keypad display.
If this happens, record the displayed message and turn off the
printer. If the problem reoccurs when you turn the printer on
again, call Technical Support.
If the problem does not reoccur after you turn your printer on
again, reset your printer's SETUP options. Retransmit your
packets.
Printer
Display
WARNING
RAM Test Failure
POWER DOWN
ROM Sum Failure
POWER DOWN
Timer Failure
POWER DOWN
Intr Test Failure
POWER DOWN
Low System RAM
POWER DOWN
Illegal Intr#
POWER DOWN
NMI Received
POWER DOWN
Low Appl RAM
Description
RAM check failed on power up. Reset
your SETUP options. Transmit your
packets again.
ROM checksum test failed.
Timer test failed.
Interrupt test failed.
Not enough RAM for system. Reset your
SETUP options. Transmit your packets
again.
Illegal interrupt occurred.
Non-maskable interrupt occurred. Reset
your SETUP options. Transmit your
packets again.
Not enough RAM for application. Reset
your SETUP options. Transmit your
packets again.
Diagnostics and Errors 8-25