Gray background only on odd number pages

could be waste toner in printer inside the printer it may need a clean.

If your background is "Black" it's going to print it all black, change your background color to "Gray" and your machine will then print a gray background instead of black. Also note that when you print a black background your toner life expectancy will be no where your expected yield ratio is. Average yield is 5% for X (X meaning size of cartridge) amount of printed pages. If your printing a black background your utilizing 100% yield coverage. Not sure if this is the answer your looking for. However basic black and white printing with a black background will print the page completely black.

It's not your ink cartridge, you have a dirty or faulty fuser film sleeve. They can be bought on Ebay.

dark background usually means the High Voltage Power Supply is malfunctioning.
replacement only.

Hi,

if you have a laser printer you may need to clean the printer or install a new drum cartridge, if it is ink-jet you will have to clean the bottom of the ink cradle it sound like you getting grey background from a toner/drum cartridge.

good Luck

Let em know if this helps.

replace the toner cartridge or get the cartridge refilled as its about to empty .

Are you saying it is this problem?

Gray Background Print Quality Defect

Here's another error that might fit the bill:

Vertical Lines Print Quality Defect

If these documents don't quite describe the issue, please post back with more details. Thanks.

change the drum unit
if the problem dos not solved clean the scan unit

It was the teflon sheet problem just change it
it costs around 6$

Thank u
Take care
bye