There are a number of issues that can be identified using Printer Test Pages, which includes: Issue of Alignment: The resulting printed image may be skewed in comparison with the electronic source image if cartridges are positioned unevenly or if a mechanical component of the printer is damaged. Thus, this creates an alignment issue. Uneven or Inconsistent Flow of Ink: In cases where the cartridge has a fault, the ink is released in inconsistent or uneven quantities. Which affects the strength of the line and its color composition as well. Blocking of Printheads: During the retraction of ink, printheads help transfer ink from cartridges to paper. In that process, if there is dried ink then it will cause printheads to become clogged which will result in poor print quality. Status of Printer: It is possible that you are seeing a mechanical printer issue rather than a system or communication issue if your printer prints a test page, but not other documents.