Brother MFC-8820DN - Manual (Page 362)

22 - 10 TROUBLESHOOTING AND ROUTINE MAINTENANCE
8
Push the lock lever down and take the toner cartridge out of the
drum unit assembly. Take out the jammed paper if there is any
inside the drum unit.
9
Put the drum unit assembly back in the MFC.
10
Put the paper tray in the MFC.
11
Close the front cover.