Paxar Monarch 9855 RFID Printer - Manual (Page 107)

747 Time out. Any RFID command (read, program, etc.)
has failed to complete in the maximum amount of
allowed time. The printer does not recalibrate (feed a
blank label) after any RFID error. For more information,
refer to your RFID Application Notes.
748 Invalid data length/data mismatch from RFID
interrogator module. The RFID interrogator module
found a problem with the data received from the printer.
The printer does not recalibrate (feed a blank label)
after any RFID error. For more information, refer to
your RFID Application Notes.
750 Printhead is overheated. Turn off the printer.
751 Printer did not sense a black mark when expected. For
errors 751-753, check the supply tracking, supply
marks, black mark sensor position, and supply roll for
binding. Press Escape/Clear and try to continue
printing. Change supply.
752 Printer sensed a mark in the wrong place.
753 Printer sensed a mark that is too long.
754 Check for a ribbon jam or remove any slack in the
ribbon by turning the take-up reel clockwise. Load a
new ribbon.
755 Printhead is open. Close the printhead.
756 Load supplies.
Diagnostics & Troubleshooting 10-11