NAiS FP Series Hardware Manual page 117

Installation
3. Align the pins and holes in the four corners of the control
unit and expansion unit, and insert the pins into the holes
so that there is no gap between the units.
4. Press down the expansion hooks raised in step 2 to secure
the unit.
8-6
Control unit
Expansion unit
Matsushita Electric Works (Europe) AG
FP0 Hardware