My HP LaserJet 4 Plus can only print out partion of the doc file, but some doc file can print out full page, that's make me headache. I also noticed the printer display "22" flashing and showed "PAR IO ERROR". I know the parallel port in & out had problem, but I don't know what to do to fix it. I just turn it off & turn on again, the "Ready" light is ON again, then it can print, just some files print out partion and some full. Any help from someone and appreciate for your time.
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