Phaser 4400 Laser Printer Service Manual 3-41Image-Quality Checkout ProceduresThroughout these procedures, the term ìverticalî refers to the process direction (thedirection paper travels through the printer); the term ìhorizontalî refers to thescanning direction (the direction the laser beam scans across the page).Cleaning procedures should always be performed before beginning any Image-qualityRepair procedure.Be sure that the paper meets printer specifications. Changing the paper, or using paperfrom a previously unopened ream, will resolve many print-quality issues.Begin with Deletions (Line, Band, Spots) on page 3-44.Image-Quality Defect DefinitionsThe Test Print (shown on page 3-43) is used to evaluate each of the print-qualityparameters. Each area of the test pattern is used for a print-quality parameter. TheImage-quality Checkout procedures explain each of the areas and the print-qualityparameters. Further assistance in evaluating image-quality problems is available inthe Diagnostics Pages on the Printable Pages Menu. These pages contain detailedexplanations of print-quality and image-quality problems along with possible causesand solutions for the problems.Index of Image-Quality Checkout ProceduresDeletions (Line, Band, Spots) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-44Fusing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-45Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-46Registration (Side-to-Side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-47Registration (Lead Edge-to-Trail Edge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-48Skew. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-49Skips / Smears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-50Spots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-51Other Print Defects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52Image-Quality Defect DefinitionsDefect Definitions Go To:LIGHT PRINTS: The overall image density is too light. page 3-54BLANK PRINTS: Prints with no visible image. page 3-56BLACK PRINTS: The print is completely covered with toner and has novisible image.page 3-58VERTICAL DELETIONS: There are areas of the image that are extremelylight or missing entirely. These areas run vertically along the page in thedirection of paper movement.page 3-59HORIZONTAL DELETIONS: There are areas of the image that are extremelylight or missing entirely. These areas run horizontally across the page in thedirection of scanning.page 3-61
