Lexmark Optra C Service Manual - Page 85

5045-001 Solid Color Test This test indicates which cartridge(s) is/are contributing to background problems. It also shows which of the four cartridges has reached end-of-life. The test produces a solid band of each color, approximately 2 1/4 inches (60 mm) long. Each color should be a uniform color with no vertical streaks. If streaks are present, replace the cartridge. Cartridges that streak contribute to background. Solid White Test This test shows the amount of background. Background is most visible as a white border 5/16 inch (8 mm) from the top edge of the paper. Background is possible in any color (or combination of colors), although it appears gray to the naked eye. Although a worn photoconductor contributes to background, background is primarily due to a cartridge condition. Photoconductor scratches show as a black vertical line. Diagnostic Information 2-53