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Re: faxes coming out almost all black
Take drum unit out, look on top and move plastic blue tab from 1 side to the other a few times. very important to make sure you replace the tab to the side it was originally on or you'll get a big, broad black band.
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The received fax is clean but when you send one out it has a black streak on it. Cool! So far so good. Makes sense because for sending, the fax scans the original document and parts of the scanning area could be dirty and so on. Therefore a black streak may appear. The same black streak would also appear when you make a copy, because the original document must also be scanned. Logical!
However for receiving faxes, the machine uses the internal memory and the print engine only, and the same applies to printing the transaction report, which comes from inside via the print engine. The scanner has no rol in either situation.
Clean the corona wire on your drum unit. It should be a blue tab on the top of the cartridge that you can slide from side to side. Make sure that the blue tab returns to the starting position (there should be an arrow on the tab that will match up with an arrow on the drum unit). If this doesn't work, replacing the drum unit should fix it. Drum units are only meant to last ~4 toner section replacements.
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.
remove the toner cartridge and you should be able to see the matching black streaks on it, if it is the problem .....don't bother trying to clean it , it is supposed to be self cleaning and you can't improve this look...replace