I want to use an HP DesignJet 4000 (Not the PS version). I don't find the way to print on that device because it prints the actual postcript code instead of the image or text itself. Is there a way to send "raw" or bitmap file to the printer ?
There is not a supported driver from HP, only for the PostScript model.
I have had the same issue in the past with a non-PS LaserJet 5, and I now use the 'Generic PCL driver' for mine.
The Gutenprint drivers currently do not have a version for your printer, although you may find some success using a similar model with a driver.