Patent ID: 7324767

Claim:
A method for identifying at least one cause of a color uniformity problem in an image-forming device having at least a first print station and a second print station downstream of the first print station, where each print station includes a charging substation, an exposing substation and a developing substation, the method comprising: selecting at least a first substation from the charging substation and exposing substation of the first print station; selecting at least a second substation from one of the exposing substation and developing substation of the second print station; adjusting a setting on the first substation, based on an interval between the first substation and the second substation; disabling at least some non-selected substations of the image-forming device; and generating a test image using the selected substations, wherein a cause of the color uniformity problem can be identified from the test image based on the selected substations used to form the test image.