I have a xerox 8200 with an error...but because werox charges so much (I live on Vancouver Island - no local sevice rep) I puchased a used machine on ebay only to get it here to find it had a falty print head! So I swapped printheads but now the new machine will not complete a heating up cycle and just fills the tray so I end up with a meassage to empty tray. Doing this just starts the heating cycle over! Anyone know what I could do to rectify this?