Apple Macintosh PowerBook 1400 - Manual (Page 161)

161 Installing Expansion Cards
3 Remove the battery from the computer.
If you’re unfamiliar with this procedure, follow the instructions in “Removing
or Replacing the Battery” in Chapter 5 of this manual.
4 Slide the speaker grill (above the top row of keys) to the left and lift it out of the
computer.
The grill is held in place firmly and may require some force to move it
sideways.
Set the speaker grill aside.
Slide speaker grill
to the left, then lift.
WARNING Do not install a RAM card without disconnecting the power
adapter and removing the battery. Installing a card while a power source
is connected could damage the computer.