Printer Repair Questions? Ask IT Technicians for Answers ASAP
If calibration had failed to solve the problem then, the problem is with the fuser unit of the problem, I don't know why do you have chnaged the blet for this problem, because this problem can caused by these things. Fuser unit, drum or the toner cartirdges. As you have already replaced the cartridges and facing the problem with all the colors, it cannot be caused by the drum in your case, so the only thing left is the fuser unit and unfortunately, the you cannot replace the fuser unit at home. You have to send the printer for repairing.
Yes then, it can the the drums.