I have a ithaca ithermal 280 receipt printer and when you print to it, it is gibberish. If I do a self test print, it prints fine. I know it is not a driver issue as we have multiple printers, and only a few of what we have print gibberish. I have compared the configuration from a good working printer to one that prints gibberish and the only different between the two is the calibration under the black dot options. On the good on, it is set to "1" and on the one that prints gibberish is set to "6". I can not change the calibration. Any suggestions would be greatly appreciated!