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Quick update for those who are interested: I exchanged the developing roller of the cartridge that had repeating patterns with the one from the cartridge that vertical white stripes (but no repeating black patterns). Lo and behold, one cartridge is working fine again. For replacement drums and...

Yeah of course, same goes for buying a new printer... still not what I want to do. I looked in both the user guide and the service manual, both don't even mention the procedure on how to clean the corona wire. I can't find any video, instructions or guides on how to clean the corona wire on that...

I know, but I can't see the corona wire in this particular toner/drum unit without disassembling. Okay, doesn't help me right now though. Looks very different on a ML-2850D toner/drum unit unfortunately. I'll probably try disassembling the older of both cartridges and see if I can spot the...

First of all, as stated, it's a Samsung laser printer. It is a compatible toner. I can't find any instructions on how to clean the corona wire, I can't see it anywhere. However, I highly doubt it has to do with the corona wire (given the pictures of the dirty drum and the fact I can't really...

Hi, I have two toners (ML-D2850B/X/L) for the ML-2850D flying around showing the same problem. The printing picture itself is okay, however I have black vertical stripes/smear in the background: On the opened drum I can see these stripes as well: When cleaning and turning the drum, both...