Brother HL-1440/ flashing alarm light and flashing yellow data light

Question edited for full 'make model (what it is)'
Question moved to Brother HL category.

chapter 3 onwards of the manual. The drum light means you need a service call.
https://download.brother.com/welcome/doc002127/ZLe_UG_eng.pdf

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Try first unplugging power, and removing toner
check inside for foreign objects or fragments of paper
Open all doors and close them back , and plug back power.

This unit might need resetting!

Here's how..

There's two ways to reset it

First: Soft Reset
1. Open front cover.
2. Hold down button located under LED's until all LED's are lit.
3. Release button and make sure drum LED is off, then
4. Close cover

Second: Factory Reset
1. Turn the printer off.
2. Hold in the circular button on the front panel of the printer.
3. Turn the printer back on.
4. When the DRUM light is lit by itself let go of the button.
5. Hold in the circular button on the front panel again.
6. Once the Alarm light comes on, let go of the button.
This will perform a factory reset on the printer.

I hope that's everything you want.
Please accept this answer if this will help you.
Thank you for using Fixya.

Follow the link below for what the lights on the machine mean. I know that if your alarm and data light are on it means the toner is empty, and you wont be able to print, you would need to replace the toner cartridge, please follow the link below.

http://welcome.solutions.brother.com/BSC/public/us/ca/en/faq/faq/000000/000100/000070/faq000170_012.html?reg=us&c=ca&lang=en&prod=hl1440_all

based on your error lights, it means your toner is empty.
I am assuming that your alarm light and data LEDS are on.

thanks adi

If your printer have no paper jam inside and paper tray has paper in it, then you need to replace toner cartridge.

http://solutions.brother.com/hl1400/download/drivers.html
Have you installed the drivers? You can also download the documentation from brother to assist you in basic troubleshooting.
Thank you,
Lee

Generally if both the (red) alarm LED and the (yellow) data LED are both blinking, it is an indication that the tone cartridge needs to be replaced. You should be close to out of cartridge.

tray this
The procedure for the factory inspection mode is as follows.
(1) Turn off the printer power switch, open the front cover, and remove the drum unit.
(2) Turn on the printer power switch while holding down the control panel button. The Drum
LED comes ON.
(3) Lightly press the panel button again.
(4) Check that all the LEDs except the Ready LED are OFF.
✒ If the toner sensor is ON, the Drum LED stays ON (error).
✒ If the front registration sensor is ON, the Alarm LED stays ON (error).
✒ If the upper paper cassette sensor is ON, the Data LED stays ON. (error) (HL-1250
only)
NOTE:
The lower paper cassette solenoid is turned ON/OFF even if the panel button is not pressed.
(5) Check the rear registration sensor.
✒ If the rear registration sensor is stuck backwards, the Ready LED stays OFF. (error)
✒ If the rear registration sensor is moved back and forth, the Ready LED comes ON at
any time. (error)
(6) Check that only the Data LED comes ON while pressing the panel button.
✒ If the paper eject sensor is ON, the Drum LED stays ON. (error)
✒ If the lower paper cassette registration sensor is ON, the Ready LED stays ON. (error)
If the registration sensor is ON, the lower paper cassette solenoid is turned ON, and
the Ready LED also stays ON. (HL-1250 only)
NOTE:
The lower paper cassette solenoid is turned ON/OFF even if the panel button is not pressed.
(7) Install the drum unit.
✒ Check that the Drum LED goes ON and the Ready LED goes OFF.
(8) Close the front cover.
(9) Continue to press the control panel button.
✒ Check that the Data LED stays OFF.
(10) Release the panel button.
(11) If all the sensors except the toner sensor are correct, the printer goes back to the Ready
status.
If any error is detected, the printer stays in the inspection mode.

(blinking every 5 seconds) Toner Low Indicates that the toner cartridge is nearly empty. Purchase a new toner and have it ready for when Toner Empty is indicated. (solid) Toner Empty Replace the toner cartridge with a new one. User's Manual is available at the following location: http://www.brother-usa.com/Data/Documentation/Printer/User/UM_HL1440_1450_1470N.pdf Hope this helps.