Question about Brother MFC 8500 All-In-One Laser Printer

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Brother MFC-8500 prints solid gray pages

I've changed the drum unit, the toner cartiridge, cleaned everything it said to clean in the owner's manual and on the brother web site (including the corona wire). Still, I have poor print quality with a solid light gray coating covering every page. The drum unit was so expensive --- too bad it didn't fix the problem! Help!

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Re: Brother MFC-8500 prints solid gray pages

I have seen the Toner cartridge in these cause this and also thought it was drum but new toner actually fixes it, have you installed new gen toner as well as drum? Make sure you tell machine you have fitted new drum too,

Posted on Oct 27, 2007

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How do I clean the drum on the Brother MFC-8440

It should be constantly cleaned by it's cleaning blade with every revolution. If that's not making continuous contact inside the drum unit, then it's time to replace the drum. The symptom to look for is not just a gray background, but images that repeat about 3 inches down the page as the drum rolls around to that point again.
If the background is gray without noticeable repeating image, it may be a defective toner cartridge. We've wasted a fair amount of money replacing Brother drums when it turned out to be the much cheaper toner cartridge. If it's a new cartridge, take it back to the store along with before and after print samples.

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1 Answer


Reference page 22-17 in reguards to cleaning the charge wire on the drum unit and page 22-16 for cleaning the document scanner. This is a link to your Brother MFC 8500. Hope this helps.
If the dark streak appears on printed documents, cleaning the charge wire will correct it.

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1 Answer

The toner tray will not pull out from the machine

Replacing the Toner Cartridge
The MFC can print up to 6,000 pages using a high yield toner cartridge. When
the toner cartridge is running low, the LCD shows TONER LOW. The MFC is
supplied with a standard toner cartridge that must be replaced after
approximately 3,000 pages. Actual page count will vary depending on your
average document type (i.e., standard letter, detailed graphics).
Discard the used toner cartridge according to local regulations. If you are not
sure of them, your local Sanitation Department. Be sure to seal the toner
cartridge tightly so toner powder does not spill out of the cartridge. When
discarding used toner cartridges, keep them separate from domestic garbage.
We recommend that you clean the MFC when you replace the toner cartridge.
1 Open the front cover and pull out the drum unit.
Place the drum unit on a drop cloth or large piece of disposable paper to avoid
spilling and scattering the toner.
2 Hold down the lock lever on the right and pull the toner cartridge out of the drum
unit assembly.
Handle the toner cartridge carefully. If toner scatters on your hands or clothes,
immediately wipe it off or wash it with cold water.
3 Unpack the new toner cartridge. Place the used toner cartridge into the
aluminum bag and discard it according to local regulations.
 Wait to unpack the toner cartridge until immediately before you install it in the
MFC. If a toner cartridge is left unpacked for a long period of time, the toner life
is shortened.
 You can use only a genuine Brother toner cartridge (TN-430 or TN-460), which
is specially formulated to ensure top print quality. Using another brand of toner
cartridge may void your MFC’s warranty. Warranty coverage does not apply to
problems caused by the use of 3rd party Toner, 3rd party Toner Cartridge or 3rd
party Drum unit.
4 Gently rock the toner cartidge from side
to side five or six times to distribute the
toner evenly inside the cartridge.
5 Remove the protective cover.
6 Insert the new toner cartridge in the
drum unit until it clicks into place.
7 Clean the primary corona
wire inside the drum unit by
gently sliding the blue tab
from right to left several
times. Return the blue tab to
the Home position ( )
before reinstalling the drum
unit assembly.
Reinstall the drum unit and close the
front cover.
Replacing the Drum Unit
The MFC uses a drum unit to create print images on paper. If the LCD shows
CHANGE DRUM SOON, the drum unit is near the end of its life and it is time
to purchase a new one.
Even if the LCD shows CHANGE DRUM SOON, you may be able to continue
printing without having to replace the drum unit for a while. However, if there
is a noticeable deterioration in the output print quality (even before CHANGE
DRUM SOON appears), then the drum unit should be replaced. You should
clean the MFC when you replace the drum unit. (See page 21-18.)
When removing the drum unit, handle it carefully because it contains toner. If
toner scatters and your hands or clothes get dirty, immediately wipe or wash
with cold water.
Just after you have used the MFC, some
internal parts of the MFC are extremely
HOT! So please be careful.
The drum unit is a consumable item, and it is necessary to replace it periodically.
There are many factors that determine the actual drum life, such as temperature,
humidity, type of paper and how much toner you use for the number of pages per print
job. The estimated drum life is up to 20,000 pages. The actual number of pages your
drum will print may be significantly less than these estimates. Because we have no
control over the many factors that determine the actual drum life, we cannot
guarantee a minimum number of pages that will be printed by your drum.

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Hi Phillip,
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1 Answer

Help with Brother MFC-8500 all in one printer

When you get the paper, can you smear the print with your fingers, or is printed on there properly.

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