Print out a mono-color pattern (all K, C, M, or Y), which will clarify if the cause is a problem with one of the Drum unit, Image transfer belt, image transfer roller, or the fusing unit. A sample page is provided with the printer driver's CD. You can print the sample page from the printer driver's CD. Before printing, you have to adjust the printer driver settings to make the problem become obvious. For details about adjusting the settings, refer to "Printer Driver Setting for Printing a Sample" described below.
- Occurs with 1-3 colors: Drum unit, or LED head failure
- Occurs with all four colors: Image transfer belt, transfer roller or fusing unit failure