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What is the drum?

The top one of the array of lights is labelled drum - what is this? It flashes on for just a half second befoe the red alarm light shines by itself.
Brother laser printer HL-820

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  • Anonymous Apr 25, 2009

    my printer has the toner light lit up and the drum light flashes also! It will not print at all what should i do?

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The drum is one of the most important major part of a laser printer. This part of the printer is so sensitive that fingerprints on it will ruin it and will cause poor print quality. If this is damaged then you will definitely need to have it replaced. This may cost a bit because it is a major component of a printer.

Laser printers works this way. A laser beam projects an image of the page to be printed onto an electrically charged rotating drum coated with selenium. Photoconductivity removes charge from the areas exposed to light. Dry ink (toner) particles are then electrostatically picked up by the drum's charged areas. The drum then prints the image onto paper by direct contact and heat, which fuses the ink to the paper.

Posted on Sep 17, 2008

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Posted on Jan 02, 2017

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How do I fix this problem: The OK light flashes. The washing machine worked for an hour but then this problem happened.


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So your device is defective and shows you what's wrong. You have to count how many times flashes red light and how many times flashes green light. Red light shows the first error number and green light the second error number.
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Has to be a roller problem. First check that the drum is being cleaned properly by the drum blade, it is responsible for cleaning the leftover image of the copy/print before it ( when you remove or look at the drum you should not see an image or toner ,it should be clean , if not replace  drum and blade). Next check that the upper fuser roller is not damaged ( This is the rollers that heat up and fuse the image into the paper  ). If these check out it could be the erase array or laser unit ...Good Luck

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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.

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Flashing red light


On the alarm and data light blinking, it is saying the toner cartridge is empty. You will need to replace it. Once in a while you can remove the toner cartridge and shake it and have it work for a little while longer. This does not work all the time however.
If you can't get it to work by shaking it, you will need to purchase a new toner cartridge.

When you have the new cartridge, you will need to slide the blue corona wire cleaner back and forth. This is just in front of the toner cartridge in the drum unit on the top of the drum unit. There is a small light blue colored piece of plastic with an arrow in it that you will just push back and forth. This will help the drum unit do its job better.

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