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Slide the Green tab on Drum Unit, Drum Error. How to clean the corona charge wires on a brother mfc-9330cdw 9340cdw hl-3150cdn HL 3170cdw colour laser printer and how to reset the drum counters back to 100% when the machine is due for drum replacement. (PART 1) Tips/Gratitude (Copy & Paste -Don't Click!) www.Paypal.me/f...