Brother MFC-8420 User Manual page 384

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.
Paper is jammed in the duplex tray (For MFC-8820D)
1
Pull the duplex tray and paper tray out of the MFC.
2
Pull the jammed paper out of the MFC.
TROUBLESHOOTING AND ROUTINE MAINTENANCE 22 - 10