The Background Is Generally Dark
Troubleshoot by checking in the following order:
Are White Areas Generally Dark When Copying?
Adjusting the density of the background may solve the problem.
[Home] screen on the control  [Copy]  [Density]  [Adjust Background Density]  [Adjust (Manual)]  adjust the background density. |
* Parts other than the background may also be affected depending on the color of the original.
Are You Using the Machine in an Appropriate Environment?
Keep the toner cartridge in a suitable location and try printing again after 2-3 hours. If the problem persists, replace the toner cartridge.
Replacing the Toner Cartridge