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Follow the instructions (like it appears you have), have a look inside the machine for any signs of paper jams, and if that still fails, give the drum a good shake. You can also blow on the metal strip that the blue tab is cleaning.
Use the corona cleaning wire to clean the dust off. Open the front cover. Remove the drum/toner unit. look on the right side of the drum portion above the toner unit for a plastic tab with a triangle arrow that points to the left. Slide this tab back and forth several times. Move the tab back to the right. Reinstall the drum/toner unit. Close the front cover.
Clean the corona wire in this manner every time you change the toner/drum.
Open your document feeder cover (it pivots away from you), then open the forward top cover (it pivots towards you). Inside the machine is the drum / toner unit, remove it. On top of this assembly is the blue tab (plastic handle) either on the left or right side. Slide that tab back and forth ~ 4 or 5 times. Reinstall the drum / toner unit. Close the top cover, then the document feeder cover. Done...
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.
There's no manual for "machine error 7C" in Bro IntelliFax 4100. To fix this issue. You will need to pull out the toner. Note: the toner and drum are connected.....At the left corner of the drum. You will see a blue tab......You will need to slide the blue tab back and forth for 20th times....And put the toner back in its place.....This is just a temp fix but you need to replace the drum to have it working its fullest......
I had this problem too. I took out the drum and vacuum the drum with a vacuum cleaner ( no brush ) while at the same time manually rotate the drum cyclinder. It worked. After a month or two, you might have to do it again. But everytime, it solved the dust problem.