Head problem. im trying to replace a print head for the magicard opera. it seems the head isnt

Question

im trying to replace a print head for the magicard opera. it seems the head isnt getting full contact with the card.. it prints a few squares when i do the self print test but it doesnt print everything, its like its printing a wavy style on the card; but when i look in the back to watch it print; i see all the panels with the squares, but they arent being printed on the card. i have tried: re attaching the head to the pegs on the lid; using other print heads [i am not sure if they are damaged' they were just spare parts from other printers i guess] any help would be appreciated.thanks in advance.moose