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Hi you have not said the toner type you replaced with though that will give not completely black copy. The problem may have been the drum unit installation. Make sure the charge unit over the drum service is present ie the one with a mesh wire like grid. If present, clean it or wipe with a soft clean and dry cloth. Clean the saw-tooth like metal plate inside that unit by slow blowing and make sure no toner particles are there. Finally screw the unit properly on the drum unit and your problem is solved.
This means the machine is over-toning ie using more toner than required caused by either improper toner or different brand of toner. The correct toner is sf 222T1. Replace developer and use the right toner and clean the drum and its blade. You may need to clean fuser rollers for cleaner copies.
If everything is coming out with streaks, it's most likely your cleaning blade which is part of the drum cartridge. I've also seen this from 3rd party toner. Get Sharp toner for your Sharp fax if you don't have it already. If your black streaks are only on copies and sent faxes, this indicates that your scanner is dirty. It's located where you feed your paper in. Lift this part up and you'll see a strip of glass running front to back about 1/2 inch wide. Clean it and that will get rid of lines.
H2 00 Thermistor open, your fusing unit needs to be serviced (cleaned or replaced)
The black copiers can be a number of things a few things to check and what the remedy could be;
Open the right door, if you notice a lot of toner/developer spilt then you could be having a charge corona short (built onto the drum unit) clean corona
Open the right door, if you drum (green or blue cylinder (depending on brand of drum) under your fuser) is coated with toner (should be all green/blue) then you could be having a drum short, replace drum unit for this.
Open the right door and on the door towards the bottom is a metal unit with a white guide built on it (transfer corona) if there is a lot of toner/developer in it (looks dirty) then this needs to be cleaned or re-built.
You also could be having a board issue causing the black copies.
check under the drum, if there is excess toner there it is most likely coming from the drum unit or the cleaning unit, this is a unit that is on the drum and is supposed to remove any excess toner and dump it into a waste container. it may be full or blocked