If a Printer has Bidirectional alignment problems, lines are not straight. The pattern shown below is designed to highlight this kind of problem.

A pair of vertical lines is printed with each Printhead color except yellow. Each section of the vertical line is printed by a different group of Printhead nozzles (one quarter), in one pass. Check the lines on this test pattern, if they have any defects like the ones described above, perform the corrective action.