Brother FAX 1840C - Manual (Page 170)

TROUBLESHOOTING AND ROUTINE MAINTENANCE 12 - 26
5
Remove the cartridge covers.
6
Each color has its own correct position. Keep the ink cartridge
in an upright position when you insert it into slot. Press down on
the ink cartridge until the hook snaps over it.
Do not touch the area shown in the illustration above.
If the cartridge cover comes off when you open the bag the
cartridge will not be damaged.
Cartridge Cover
DO NOT TOUCH
New Ink Cartridge
Ink Cartridge Hook