Advantech RS-100-RT User Manual page 27

install the CPUs, first turn off your system, remove its cover
and follow the directions below that come with the CPUs.
Always observe static electricity precautions when installing
CPUs. The general procedure is:
Pull the lever outward
Raise the retaining lever of CPU socket to a position
perpendicular to the socket up.
26 RS-100-RT User's Manual