Dell 3333/3335dn Mono Laser Printer - Manual (Page 48)

5 Insert the plug of the fax card interface cable into the receptacle of the system board.
6 Release the latch, and then close the system board door by lowering the scanner.
7 Push in on the screws while rotating them clockwise a quarter turn to lock the system board into place.
Warning—Potential Damage: Make sure the system board is locked to prevent possible damage to the printer if it is
moved.
Additional printer setup 48