Hi! the drum light on my Brother HL-2170 laser

Hi,

1. Make sure that the machine is turned on.
2. Open the front cover.
3. Press and hold OK for about two seconds to display Drum Unit, and then press OK.
4. Close cover.

read page 60 of the manual:

http://welcome.solutions.brother.com/BSC/public/files/dlf/doc002308/cv_hl2140_usaeng_usr_d.pdf

With the front cover open, press and hold down Go button until all 4 LEDs are lit. Once all 4 LEDs are lit, release the go button, then close the front cover.

This will reset the drum counter.

GOT IT THROUGH BROTHER WEBSITE DOWNLOAD

DRUM UNIT "spent"
It can be reset if the printing quality is good
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.
Caution: Reset the drum counter only when you replaced the drum unit with a new one.

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.
   
4. close front cover

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.

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.

hmmm...and there is no functionality? I recommend a new set of drivers first from www.brother.com

http://tinyurl.com/6qcpgy

if 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.