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Did you prime the cleaning blade with toner when you installed it?, and did you ensure the new cleaning blade did not flip!!!!, re-check the new installed cleaning blade, place a small amount of toner from the toner bottle on the drum along the whole drum. and using your hands at both end of the drum DO NOT TOUCH THE DRUM" turn just a 1/4" CCW (To ensure the cleaning blade is set) then CW to see if the toner is removed. your drum might need to be replaced and or the fuser unit have a example of the copy?
the toner is flowing in the steps indicated bellow.
1- toner is transfered from the developer to the drum unit. ( the developer wiper blade is responsible for, clogged toner on the surface of the blade is main cause)
2-OPC drum unit. (the opc drum cleaning blade is responsible for this, the aging defect is most, may be the sharpness of the blade is over causing so or the waste toner drive shaft fails which cause back pressure of the toner is responsible).
3- ITB unit, ( the same as drum unit).
Hope rectifying the above may overcome the problem.
Double print usually happens when Drum completed its life and Cleaning Blade unable to clean the drum surface properly, Replacing of Drum and Cleaning blade will gave you good copy quality, Don't forget to clean Charger unit
L4-01 is a main motor lock error. More than likely something is locked up, rather than a problem with the motoer itself. Make sure the drum and Developing unit are turning freely. The Fusing unit binding can also cause this error. Turn the machine off, remove the developing unit and the drum. Put the developing unit back into the machine, close the doors and turn it on. If you can hear the motor run and there is no error code, then the drum is locked up, probably due to a flipped cleaning blade. The next area to check is the developing unit itself. Sometimes if the bushings go bad at the ends of the developer roller, it will cause a motor lock. There is a white coupling on the rear side of the developer unit. Turn it counter clockwise about a half turn, being careful to hold the unit level. There should be little resistance. If all seems O.K., then the Fusing unit is probably the cause. Also pull out the paper cassette and make sure nothing is preventing the pick up rollers from turning.
Sounds like a worn drum unit primarily the cleaning blade on the drum is failing. If you don't change it out soon the dirt escaping from the drum and dirty copies will foul-out you fixing unit, = more $$.