Why is my drum light in on on my brother hl-5370dw

SOURCE: brother hl 2040 printer

This indictes its time to relace the drum.(drum life is up to 1200
copies)

mongrelken.

SOURCE: Brother printer HL 5250 DN.

Brother Drum Reset Instructions


The Drum LED continues to blink if the drum counter was not reset when you replaced the drum. To reset the drum follow the instructions below:
Press the cover release button and then open the front cover of the printer.


Press and hold down Go button until all 4 LEDs are lit. Once all 4 LEDs are lit, release the Go button.

Close the front cover.
Make sure that the Drum LED is now off.
Reset the drum counter only when you replaced the drum unit with a new one.

SOURCE: brother HL 5250 red light flashing

I found this solution on the web-- Hope it helps.

The HL-2070N gets stuck in a toner end-of-life error condition. Perform the following to clear :
With paper loaded, new toner in,

Open front door
Turn off printer
While holding down the GO button, turn printer back on
When all four LEDs light up release GO button. All LEDs will turn off
Press the GO button 2 times. The 3 LEDs (toner, drum, paper) will light up solid
Press the GO button 5 times
Paper light will be blinking
At this point the toner end-of-life condition has been reset. Close front door.
BTW, I got this from Brother Support. Also, just a reminder, timing is important here so don't pause between button presses.

SOURCE: How do I replace the drum on a Brother hl 2040.

I have 'reused' the same drum three times and still prints like a charm.
Open the toner door and pull out the toner/drum assembly. Take the toner off the drum tray. Use a alcohol pad or lint free cloth and wipe the mauve coloured drum to remove the excess lint and toner collected on the drum. Rotate the drum with the white gear and keep cleaning until the whole drum is done.
Put the toner back in the drum tray. Clean the corona wire by sliding the blue tab back and forth 3 or 4 times. Put the toner/drum back into the printer and close the door.
After the printer does the self test the drum light will cone on again so then you need to reset the counters.
Open the door again
Hold the GO button until all 4 lights are lit up
Release the GO button
Close the door
Printer will self test and should extinguish all the trouble lights.

SOURCE: Drum light comes on my Brother HL-5040

You need to reset the drum counter. Open the front door and hold the go button until all the lights flash. Shut the door, ready to print...If you press the go button 3 times it will give you a printout that shows the usage level of the drum.