Enter service mode and clear counter for drum, then power off the machine remove drum cart. then remove drum and replace with new one recommended that developer also be replace at the same time clear that counter first along with drum counter. once drum and developer replaced run F8 in service mode before making any copies or prints or will have to do it all over again.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f
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