Open the front cover and pull out the toner/drum unit. Press the (blue) lever to eject toner cartridge, the remainder of the unit is the drum unit that needs replacing. DR520 is the type you need. Get it at any office supply store.
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Could be the drum or the fuser causing your problem. To replace drum you need to open the machine by hitting the gray release latch on eft ide of machine to clamshell it open. Inside you will see th toner cartridge/ dv unit on the far right and immediately to the eft of that is the drum unit. You need to release the dv unit by turning a lever before removing the drum unit. Should probably call a tech to do this for you so you dont scratch or damage the drum. Drum life on that model is about 30,000 prints. Whats the meter reading on that copier?
do you already change your drum?pull out your developing unit and you can see cooper plate inside the machine,possibly its broken or this problem due to yourHV board.You can try change your AE sensor. Very old model
This machine has a separate drum and toner cartridge. Replacing the toner does not reset the drum light. Double check that the light on is, in fact, the drum light, and if it is, replace the drum unit. This should resolve your problem.
In order to replace the drum unit, do this:
1) With the printer on and the drum light blinking, open the front cover.
2) Press and hold the Go button for about 4 seconds until all the LEDs light up. Once all LEDs light up, release the Go button.
3) Pull the print assembly out of the machine.
4) Push down the green lock lever to take the toner cartridge out of the drum unit.
5) Put the toner cartridge into the new drum unit.
6) Reinsert the print assembly into the machine.
7) Close the front cover and verify that the lights turn off.
It is theoretically possible that you could reset the counter without actually changing the drum by simply skipping steps 3-6 above, but I have never tried it before and Brother may be checking a chip on the drum unit to verify that it is, in fact, a new drum unit. If they are, you will have to actually replace the unit to make the light go off. I would strongly recommend against resetting the counter without actually changing the drum though, as your print quality will degrade and the machine may start to dump toner into the inside creating a rather large mess and a hefty repair bill.
If your print job prints ok, ignore it. Just bear in mind you'll need a new drum soon. The drum is a light sensative roller that ink from the toner cartridge adheres to where the laser hits it. When it is no longer magnatized enough to hold the toner you'll see your print jobs start to lose that toner color. Just pull the drum out, buy a new one and put it in. Just don't expose the drum to light very long.
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.
You have to reset the drum counter.
Leave the front cover open
Press and hold the "cancel" button until all the lights flash in sequence
Close the front cover
You should be good fro another 30 - 40 thousand copies.
Hope it helps