Patent ID: 7420719

Claim:
A method comprising: printing a test document using a multi-function printing device to produce a printed document; examining said printed document in a first direction to determine a first skew of said printing device, wherein said first skew comprises a combination of raster output scanner skew and media path skew; examining said printed document in a second direction to determine a second skew comprising said media path skew of said printing device; subtracting said second skew from said first skew to calculate said raster output scanner skew of said printing device; copying said test document from a platen of said printing device to produce a platen copy of said document; examining said platen copy to determine a third skew of said printing device, wherein said third skew comprises a combination of raster output scanner skew, media path skew, and scanner image bar skew; and subtracting said first skew from said third skew to calculate said scanner image bar skew of said printing device.