Apple PowerBook (3400 series) - Manual (Page 167)

13 Remove the new RAM card from its protective package.
Hold the card by its edges. Don’t touch the chips or metal parts of the card.
IMPORTANT Use a RAM card with TSOP low-profile RAM chips only.
Installing a card with high-profile chips may damage your computer.
Save the protective package that the RAM card came in, in case you want to
remove the card later.
14 Lower the card into the computer and align its connector with the socket on the main
circuit board.
Make sure the ribbon cables for the keyboard go on top of the installed card.
Install the RAM card into this socket. These ribbon cables go on top of the installed RAM card.
Connector
RAM card
167 Installing a Macintosh PowerBook RAM Expansion Card