Drum light on will not print - Brother HL-2040 Laser Printer

This machine has a separate drum and toner cartridge. Replacing the toner does not reset the drum light. Double check that the light on is, in fact, the drum light, and if it is, replace the drum unit. This should resolve your problem.
In order to replace the drum unit, do this: 1) With the printer on and the drum light blinking, open the front cover. 2) Press and hold the Go button for about 4 seconds until all the LEDs light up. Once all LEDs light up, release the Go button. 3) Pull the print assembly out of the machine. 4) Push down the green lock lever to take the toner cartridge out of the drum unit. 5) Put the toner cartridge into the new drum unit. 6) Reinsert the print assembly into the machine. 7) Close the front cover and verify that the lights turn off.
It is theoretically possible that you could reset the counter without actually changing the drum by simply skipping steps 3-6 above, but I have never tried it before and Brother may be checking a chip on the drum unit to verify that it is, in fact, a new drum unit. If they are, you will have to actually replace the unit to make the light go off. I would strongly recommend against resetting the counter without actually changing the drum though, as your print quality will degrade and the machine may start to dump toner into the inside creating a rather large mess and a hefty repair bill.

The drum counter will have to be reset, Use the following steps.

1. Open the front door.
2. Press and hold the cancel button (x button) until all the lights flash in in order.
3. Then close the front cover.

This will reset the drum counter so that you can continue to print.

We have just changed our drum unit but the drum light is still flashing. The printer is printing though. Any suggestions?

When the drum light is on solid, it's time for a new drum, if you have a new drum, just open the front door and hold the go button til all lights flash and the drum is reset. Press the go button 3 times and it will print a sheet showing the drum status.

Try cleaning Drum or replace Drum,that's why the Drum light comes on

Imaging drum is empty or missing (Error 40204) Light pattern Description The imaging drum is empty or missing. The imaging drum light is blinking, and then printer stops printing. An error 40204 is written to the event log. The printer cannot detect the imaging drum correctly. Action

1. Reinsert or replace the imaging drum.
2. If the imaging drum light is still blinking but the Attention light is not on, turn the printer off, and then back on.
3. Repeat Steps 1 and 2 with a new imaging drum.
4. If the problem continues, contact HP Customer Care at http://www.hp.com/support/clj2550 or see the flyer that came in the printer box for other contact information.

Imaging drum e-label reader is faulty (Error 10004) Light pattern Description The imaging drum light is blinking, and then printer stops printing. An error 10004 is written to the event log. The imaging drum e-label reader is faulty and the printer cannot detect the imaging drum correctly. Action

1. Reinsert or replace the imaging drum.
2. If the imaging drum light is still blinking but the Attention light is not on, turn the printer off, and then back on.
3. Repeat Steps 1 and 2 with a new imaging drum.
4. If the problem continues, contact HP Customer Care at http://www.hp.com/support/clj2550 or see the flyer that came in the printer box for other contact information.

All fixed now I put another toner cartridge in it

Sounds like it's time for a new drum but, here's the reset procedure that should make the drum light go off and allow printing.

Make sure the machine is turned on and the drum light is blinking. Press and hold the "GO" button for 4 seconds (approx.) until all four lights are lit. When all four are lit, release the "GO" button. Make sure the drum light is off now. The drum is now reset.

THIS WILL NOT IMPROVE THE QUALITY OF PRINT as the drum will need to be replaced in order to do that but it will allow you to continue using the drum until it reaches and unacceptable quality.

Hope that helps you.

f the Drum LED is still lit after replacing the drum unit, the Drum counter may not be reset.
Reset the Drum counter as follows:

1. Open the front cover.
2. Locate the control panel button under the LED lights on the left side.
3. Press the control panel button until all lights are lit, then release it.
   The Drum counter is now reset.

Hi, to reset drum light follow this sequence: press cancel, exposure, cancel, exposure. Display goes blank, enter 24, print, 07 print, cancel cancel. Cheers

Andy