This error means "incorrect data was sent to printer".
are you trying to print through wireless network ? if yes then you will have to renew its IP or disconnect the printer from network and re-connect. Also ping the IP.
Mornach 9825 printer is error "Invalid Command! Line 01 Code 400 ".How issue this error.
SOURCE: In attempting to print barcodes from a Monarch
Remove the printer driver from your computer ... get the latest driver that is compatible with your OS, reload and try again ...
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