I have a Brother 5240 printer. The toner light

It is probably the toner cartridge, not the drum. I suggest swapping in old toner cartridges and drums to nail down the problem. I keep at least one old toner and one old drum for that purpose. By the way I just bought a toner cart from monoprice.com. It will not last as long as a Brother cart, but costs very little.

If you are using a generic toner, replace it with cartridge from Brother. Many of these are caused by using a refilled cartridge or a generic cartridge. Use a cleaning sheet and run it though a couple of times, if this does not clear it up you need a new cartridge.

You may have a bad toner cartridge if it is a 3rd party. You can also try removing the cartridge and re-seating it.

WHen the toner light comes on this means you need to replace the toner cartridge because its empty. The toner its the powder that is used to put on the paper, you will no longer be able to print until you replace it with a new one.

Are you using a factory new ink cartridge?
Please consider the following:
If you are using a refilled or third party cartridge that may well be your problem. Most manufacturers build logic into their products to prevent the use of “Other Equipment Manufactured” cartridges as well as re-filled cartridges.
They do this to prevent problems from contaminated inks causing problems with print quality or damaging the physical printhead.
If you are using factory new cartridges, then please call the manufacturers Technical Support for assistance with the warranty on the cartridges
Don

turn off the printer and cacel all the documents from print spooler .and switch on it.

that error usually indicates that the toner has reached its end of life
or the drum is not properly installed.

i had one person who put the toner in but threw the drum cartridge away.

My HL-5240 did the same thing, Here is what I found:

Look at the back of the printer. Pull down the back cover. Look to the right and the left of the exposed internals of the printer and there should be another handle/knob you can pull down. Pull these both down simultaneously and check to make sure there isn't a piece of paper in there! This was a shock to me! My office printer was held up for days until I found this hidden door in the back! I felt like an idiot that it was from a stupid paper jam!

1) Turn off printer
2)Turn back on
3) Remove Drum and Toner.
4)Press Go for 1 second(it appears to do nothing)
5)Put Drum and Toner back in.
6)Press Go for 1 second(it appears to do nothing)
7)Close door.
Try that

This works on several different Brother Printers to get rid of toner/drum empty errors:

1. Open the front cover and leave open while completing the following steps.
2. Turn the printer off.
3. Hold the 'go' button while turning the printer on. All panel lights should be on.
4. Release the 'go' button.
5. Press the 'go' button 2 times.
6. Pause.
7. Press the 'go' button 5 times.
8. The toner light should be off.
9. The paper light should be on or flashing [doesn't happen on all].
10. Close cover. The ready light should be the only light on.