Datamax-O'Neil MP Nova Operators Manual - Manual (Page 42)

8. Troubleshooting
Test Method 2
Note:
This method is only for advanced
troubleshooting by service technicians.
This shows all information sent to the
printer in hex-code and the function is
used to determine possible
communication faults, since it is possible
to see exactly what data the printer
receives.
1. Switch off the printer.
2. Press the print button, but do not
release it.
3.
Switch on the printer without releasing
the print button.
4.
Release the print button when the
printer starts printing.
The printer starts by printing information
as in test method 1. It then stops and will
continue printing once the data is sent to
the printer. By checking the received data,
you can determine whether character
received agree with the Label point-
commands and the transferred ASCII-
characters.
Differences between the received signals
and the transferred characters may be due
to incorrect parameters (e.g. Baud rate) or
the presence of electrical inference during
the transfer. Check the communication
cable, the length of the cable and whether
or not the cable is close to power cables.
Cancelling Test Methods
To cancel the test methods, turn the
printer off and wait 15 seconds before
switching it on again.