Paxar Monarch 9413 - Manual (Page 134)

900 RAM test failure.
901 ROM/EPROM checksum failure.
902 Software timer failure.
903 Software interrupt failure.
905 Illegal interrupt.
906 Non-maskable interrupt.
907 Low RAM error.
908 Non Volatile RAM checksum failure.
909 RAM corrupted.
910 Warm restart.
911 Version string mismatch.
Errors numbered 900-911 occur when you turn on the printer.
They may indicate a circuit board failure. Errors numbered
930-940 are errors that may occur during the loading of flash
memory. Errors numbered 950-999 indicate a circuit board
failure. Call Technical Support if you receive any of these
messages.
9-16 Errors