Two identical printers, same doent, different prints?

We have 2 HP LaserJet 2300 printers both having the same firmware date code hooked up in a network. One of them works fine, but the other printer prints with the printing slightly shifted vertically down and horizontally right. We tested printing the same doent to both printers, but the defective one always has the doent shifted towards that bottom right corner and the doent gets cut off in the non-printable area. The network includes XP and VISTA. I don't think the computers are the problem, but perhaps the network. Although it does print fine in the other 2300 printer, so it could be the printer itself. Anyone got a clue how to fix this?