Message reads: Drum error. Slide the green tab on drum unit in each color. Refer to user's guide for the procedure.
The green tabs that you have to slide are under the color cartridges, so remove the three color cartridges and you will see three green tabs, to slide the tab across the wire you have to first open the translucent plastic wire cover, then slide the green tab across the wires and return it to it's original position, close the wire covers, replace the color cartridges, and reassemble the printer. All the Best
I wrote an article about it with illustrations you can find it by clicking on the link below.
Brother HL 4040 and 4070 Drum Error Troubleshooting
If you need further help, I’m available over the phone at https://www.6ya.com/expert/kevin_6c091a6aba0555a3
You may have to slide the green tab multiple times to resolve the drum error.
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