I had a similar problem, but my alarm light was "only" blinking. here is what i did (and might work with your printer too):
open the front and take out the drum&toner unit. take out the toner cartridge und put a little piece of paper in the hole (the one you can look right through to the other side) either at the right or left side of the cartridge. put the toner in the drum unit and then everything back in the printer. after that my printer worked and still works fine.
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Below are instructions that I have found from the internet. Hope that they will help.
Open the front cover of the printer.
Hold down the Go button for 4 seconds until all the LEDs light up. Then release the Go button
Remove the drum unit and toner cartridge assembly.
Replace the drum unit and toner cartridge assembly back into the printer.
Close the front cover of the printer
Your drum unit should now be reset
MFC / DCP PRINTER SERIES
1.Remove the drum unit and toner cartridge. Wait 1 or 2 minutes.
2.Replace the drum unit and toner cartridge into printer.
3.The error message "Change Drum Soon/Drum end soon" will continue to appear if the drum counter was not reset when you replace the drum unit.
4.To clear this error message, you need to reset the drum counter as instructed below.
5.Make sure that the machine is turned on.
For MFC users: To confirm you are installing a new drum, press 1. For DCP users To confirm you are installing a new drum, press the Up Arrow key
7.When the LCD shows Accepted, close the front cover.
8.Your drum is now reset.
Resetting the drum unit will not improve print quality. It only resets your drum and allows you to continue to print. You decide when to replace the drum unit not the manufacturer!
It is a color laser printer.it has 4 toner cartridge(1)black(2)magenta(3)cyan(4)yellow all cartridge is missing or toner finished.Please purchase full set toner.All toner cartridge has a image sensor.When toner is run out then it is out of work.
Because I was getting gray shading on my pages and data was still being printing, I decided to change the toner cartridge. Now the pages are clean and white and all the lights function properly. Most cartridges that are running on empty don't print any data at all or at least print the data at the top of the page and gradually gets fainter sp? on the page. Who would have thought just by changing the cartridge would solve the problem? So glad that's all it was........wasn't excited about having to buy a new printer.
As far as I know, filling up with toner is not enough. There is an electronic chip that must also be replaced, so the toner cartridge tells the unit it is a new one. Check with your supplier for such chip.
Chances are that you have a piece of paper stuck in the printer. Open the rear door and check there first. If that's not it, remove the toner/drum assembly and check behind that. The other place to check is between the drum unit and the toner cartridge.
Pull the drum out the front door, remove the toner cartridge and check for any paper and remove it.
Make sure there is toner in the toner cartridge. Look at the lights on the printer. Look at the labels beside them. The label "Toner" will have two lines going to two lights. If those two lights are on when you try to print, you are out of toner. But a now toner and install it in the drum. Install the drum back into the printer.
If not, look at the drum. At the rear top is an opening across the whole drum. Look inside it, you will see a metal grid. That grid must be clean or it will cause small sparks. These sparks will cause a false toner empty error. Buy a can of compressed air from Best Buy (or wherever). Use this compressed air to blow clean the grid. Move the small blue tab at one side of the opening ti the other side and back again. Reinstall the drum and try printing again.
If neither of those help, write back and let me know what lights stay on when the printer stops.
Alarm and Data lights on together is from low toner. If shaking of the toner cartridge is not helping, change the toner. Drum light is usually on because of the print counter. If the print quality goes really bad, change the drum and reset the counter by holding the front button wile the front cover is open till all lights come on. Release the button and close the cover. If just Data light is on, check the print ques, some jobs might got stuck there.