Method of calibrating a wiper position in an ink jet printer

A method of calibrating a wiper position in an ink jet printer comprising a plurality of print heads, each of the plurality of print heads having a nozzle plate and a wiper mounted on a common base comprising a wiper carriage movable along a guide rail arranged to wipe the nozzle plate, the nozzle plate having a number of nozzles each of which is in fluid communication with a pressure chamber, each pressure chamber having an actuator for exciting a pressure wave in a liquid in the pressure chamber, and a detection system arranged to detect pressure fluctuations in the pressure chamber, said method comprising the steps of:

• a) adjusting the wiper to a position in which it is set against the nozzle plate;
• b) exciting a pressure wave in at least one of the pressure chambers;
• c) recording the pressure fluctuations in said at least one pressure chamber;
• d) deciding, on the basis of the detected pressure fluctuations, whether the wiper is set correctly against the nozzle that is in fluid communication with said at least one pressure chamber;
• and
• e) correcting the position of the wiper if necessary;
• wherein the steps a) and e) comprise adjusting a position of the guide rail.