PLotter requests that I replace all the ink cartridges, so i did so and replaces everything else (ink, printheads, cleaner cartridge) and all was well for about an hour, then was asking me to replace them again. I pulled them all out and cleaned the plotter from head to toe. Replaced everything, wrkied for about 5 minutes, and then got teh error again. IT came up and replaced a circuit board in teh back (I wasnt here so i have know idea what was acutally replaced, the other desiogner said it as a circuit bord, which one I dont know, and IT wont tell me, whatever, thats another story). After replacing the aforementioned board, worked for a day or two, then the error came back. Company doesnt have HP Service agreement cuase IT siad they had an agreement with HP for parts. Well, now it isnt working. Everytime I plot, the plotter beeps, says to replace the printerheads, even though they are new, and I have to override the error "Printerheads may reduce printing quality" on every single print. I do a lot of batch plotting and gettting up after every sheet in getting a little annyoing. IT cant figure out the problem and wont anwser the phone. TIA