Vertical stripes that appear in images scanned after the Color OneScanner 1200/30 or Color OneScanner 600/27 has warmed up may indicate a problem with the scanner optical assembly. Customers usually report that the stripe is approximately 1/4 inch wide appearing on scans. The location of the stripe can vary and may appear intermittently. The stripe typically is a faded purplish color and the edges are not sharply defined. Contact your service provider for assistance to get this corrected.