Apple PowerBook (3400 series) - Manual (Page 162)

8 Carefully pull the keyboard forward to loosen the four tabs at the top. Be very careful to
avoid pulling the keyboard out too far. The cable attaching the keyboard to the computer
is very short.
This action should release the top edge of the keyboard from its enclosure,
allowing you to grasp and free the entire keyboard.
WARNING Don’t pull the keyboard away from
the display more than 3/8". If you pull the keyboard
away from the display more than 3/8", you may
pull this cable out of its socket.
Gently slide the keyboard away from the display a short distance to disengage these tabs.
162 Appendix C