Apple PowerBook (Duo 270C) - Manual (Page 245)

Installing the card
1. Unlatch the top cover of the dock by pinching the
raised bumps just inside the front opening.
2. When the latches release, tilt the cover upward slightly
(to about a 30° angle) and then lift the angled cover
straight up to remove it.
3. Touch the power supply case to discharge any static
electricity that might be on your clothes or body.
continues .
Power supply case
This Not This
Chapter 13: Building a PowerBook Duo System 229