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check printer settings or document settings back ground color settings
you can print a page color to any of the color bar settings so there is a setting that has been change to grey that is causing the problem
Can you see the entire page when you issue the PRINT command. Are you using Windows. If you are trying to print a picture from a website, you firstly need to take a snapshot of the entire page by holding down the left ALT key and pressing the key marked PrintScreen (usually located below F10,11,12) on your keyboard. Then use an Image editor to cut out the picture and then PRINT it.
Open rear cover and check gray plastic film not torn or broken. If film broken printer requires the fuser replaced. This is not a user replaceable item as its quite a tear down to reach the fuser.
Image defects may also be caused by toner cartridge. Check toner cartridge for background issues. To do this print the printer's demo page and open door when paper is half in the printer. Remove the paper jam and check unfused image for defects. If defects occurs then replace toner.
1.Charge – Print Quality (PQ) -- The charge roller evenly distributes a negative charge on the photoconductor (PC) drum.This evenly distributed charge acts as the film that is discharged (exposed) by the laser to create the latent image. a.Print Quality effected:Faint, Entire Blackbackground, GreyFog/Haze b.Parts Involved: i.Drum -- A drum cartridge is coated with a photoconductive material that allows electricity to pass when exposed to light.As an example of why this can be the failure, if you leave a drum out in light long enough, you will get dark backgrounds or just black pages.However, drums do wear out over time too; specifically the photo material the drum is coated with.As this degrades, more of the positive electricity on the inside of the drum gets through and grabs toner, as if the laser wrote to every square inch of it. A damaged or defective PC drum can cause black streaks/lines, voids, speckles and various other print quality problems. ii.Charge Roller –Also known as the BCR or Bias Charge Roll. The charge roller pulls double duty.It energizes the outside of the drum with negative energy and as a result it cleans any previous latent images.If the charge roller were failing to energize either due to the HVPS or the charge roller itself, it wouldn’t clean any previous unused toner deposits from the last revolution would start to accumulate and appear on paper more and more causing haze.A missing charge roller causes completely black pages.
iii.HVPS – High Voltage Power Supply -- Responsible for charging components such as the inside of the drum, the charge roller, and transfer roller.If the HVPS does not give enough to the charge roller it can fail in erasing the drum, causing entirely Black pages to be printed.
Sounds to me like the toner - that is the toner cartridge has the wrong toner in it. The drum should be OK - clean it up first and then use a genuine toner cartridge OR you can buy our refill kit on eBay - search for Brother HL2040 - michellem6123