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This is an error for the Drum units. The E020 is for toner concentration, the " 01 " is for Magenta and the " 81 " is for the concentration in the developer unit for the window sampling is below 70. Best thing to do is replace the Magenta Starter and do an initialization procedure in Service Mode. Better left to a Tech.
Did you change the Magenta stater/ developer? A E020 code is saying that the toner desity is low. Try replasing the developer and run the ATDC for Megenta and see if that helps. You may have a problem with the developing ass'y it self. You may be able to take another colors dev. ass'y with the hopper open and see if the code goes away. The sub code 0124 means that it is the Magenta dev. ass'y