If you notice that horizontal or vertical lines in your documents are not being printed correctly to your LaserWriter IIf or IIg, you will need to make a simple adjustment to your LaserWriter's setting. To do this you will need the LaserWriter tools disk that came with your printer.
Just follow these three steps:
1. Open the LaserWriter Utility application on the LaserWriter disk.
2. Under the Utilities Menu, choose 'Set PhotoGrade.'
3. Move the slider all the way to the left towards the 'More Levels of Gray' option.
Your printer will then been reconfigured with the proper settings.