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Hello luvmor. The code means the that when the copier tries to calibrate its colors (gradation) it cant get the yellow to calibrate.This almost certainly because the yellow drum has reached the end of its life.On this machine,it is not as simple to replace the drum unit as it could or should be.Newer machines are far easier to perform a drum replacement.I would have to recommend a trained technician to perform this procedure.
E733-0001 Error Code
E733 and machine locks up with progress bar at 98% on boot up?
I would refer this error to a qualified service Tech.
Deals with replacing DC controller, Main Controller and Boot Rom as a set. Also, mention of replacing the Switching Regulator PCB Assembly if the previous failed to resolve.