My Brother DCP-7020 would only print one page at a time and I would get a paper jam error or paper feed error after the first page of a multiple page document was printed. I found the solution described at [ Ссылка ] and [ Ссылка ]. While that solution is for a slightly different version of the Brother printer, I found that if you follow the instructions in the video [ Ссылка ] until the 3 minute point (3:00), you can fix the problem very quickly. Once the spring is removed at 3:00 in the video, you can push down the little white plastic arm that is slightly hidden by the black gear. If that arm sticks when pressed down, that is likely your problem. Remove the small rubber pad on the metal solenoid where it sticks, and voila, the page feed problem was solved, though the printer now makes an audible click as each page is fed. I'd rather listen to the click than only print one page at a time. I'm sure you can make a replacement pad out of some other material. This fix should work for the Brother MFC-7420, MFC-7820, DCP-7010, DCP-7020 and the DCP-7025. Hope this helps.
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