I have a canon irc 4080. The original code was e020-04b0 which indicates black drum end of life. Put in a new drum and got e020-0434. I noticed that in initial rotation the machine does not lay down the black patch and that is why I am getting the e-code. What I can't figure is what tells the machine to lay patch. Replace laser, power supplies, hvt's, driver pcb's along with some other parts..........still not working. NEED HELP!!!!
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