2-172 Service ManualADF & Scanner Image QualityDark image quality (using ADF or Scanner)Before starting, check the media route for foreign objects, such as staples, clips, and scraps, in the media path.Step Check Yes No1 Check the large and small platen glass on the scannerunit assembly.Is the large and small platen glass contaminated?Clean both sidesof the large andsmall platenglass.Go to step 2.2 Check the three mirrors in the scanner unit assembly.Are the three mirrors contaminated or show signs ofdust?Clean the threemirrors in thescanner unitassembly.Go to step 3.3 Check the white strip on the bottom of the large platenglass.Is the white strip contaminated?Clean the whitestrip and PORthe machine.Go to step 4.4 Check the scanner lens.Is the scanner lens contaminated?Clean thescanner lens. Go to step 5.5 Perform a print test using the ADF & scanner unitassemblies.Does the error continue?Replace theCCD/card lensassembly.Go toProblem solved.6 Perform a print test using the ADF & scanner unitassemblies.Does the error continue?Replace thescannercontroller cardassembly.Problem solved.Leading edgeTrailing edgeLeading edgeTrailing edgeGo to “Scannercontroller cardassemblyon page 4-132.X654, and X656)”X652/5535dn,removal(models X651,
