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Most probably it is saying "Change the Drum." This is because the manufacturers have entered an arbitrary number of cycles as a reminder for you to buy a new drum. You can ignore this until the copy quality becomes too bad to read, then replace the drum.
Try to copy a document. If the copy comes out black then the the
scanner is dirty. Clean the scanner glass (products on the market that
clean by sending through the scanner) and try to copy again. If after
cleaning the scanner, the copy is still black you have a scanner issue
and the laser/scanner unit will need replacement. Best of luck and
please post back with any questions or just to rate the solution.
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......
Probably caused by the toner cart. Only use genuine new Brother brand supplies. Remans fail quite often with Brother machines. Possibly bad gears on fuser drive. But with the poor print quality, I suspect it is the toner.