Apple Macintosh PowerBook 1400 - Manual (Page 162)

5 Place your finger under the top edge of the keyboard and gently fold it forward so that
the keyboard rests upside down on the lower part of the computer’s case.
If you can’t easily put your finger under the keyboard, carefully slide the end
of the flat screwdriver under it and lift.
Take care not to move the bottom edge of the keyboard away from the case, to
avoid straining or disconnecting the keyboard’s cable.
162 Appendix C