Brother MFC-420CN User Manual page 140

8
Pack the printed materials in the original carton as shown below.
Do not pack the used ink cartridges in the carton.
If you are returning your machine to Brother as part of the
Exchange Service, pack only the MFC. Keep all separate parts
and printed materials to use with your "Exchange" machine.
(For Canada)
9
Close the carton.
11 - 21 TROUBLESHOOTING AND ROUTINE MAINTENANCE
(For USA)