Patent ID: 7281777

Claim:
A pagewidth inkjet printer comprising: a stationary pagewidth printhead, said printhead comprising a plurality of printhead modules mounted end to end on a carrier and extending across a width of a page, each printhead module being configured for receiving dot data, wherein at least one printhead module has an erroneous rotational displacement relative to the carrier; and a printer controller for communicating the dot data to the printhead modules, said printer controller being configured for at least partially compensating for errors in ink dot placement due to the rotationally displaced printhead module; and a memory containing at least one correction factor that at least partially compensates for the ink dot displacement, said correction factor being determined by measuring the erroneous rotational displacement of the rotationally displaced printhead module, wherein said printer controller is configured to use the correction factor to determine an accumulative correction factor for each printhead module, including non-rotationally displaced printhead modules, and alter the output of the ink dots to at least partially compensate for the rotational displacement.