When changing a module shut this module down and turn the power for the module off in the managemant GUI.
The rest of the system can stay powered.
Before installing a Com Express module check if the RAM is installed, and that the heatspreader is correctly mounted, and depending on the module if all thermal pads are in place. Also the orientation of the heatsink fins has to follow the airflow trough the case. If it is an Antares the cooling fins have to point from the front to the back. In an Arneb case they have to point from side to side.
The screwholes where the module lays on the spacer bolts (8 mm in height) have to be free. Or smaller spacer bolts (5 mm high) have to be installed.
When starting the module for the first time after installation, it is necessary to set the time again, as the modules don't have an own battery and are provided with electricity for the clock by the battery on the frontpanel.
Before installing an Apalis module check if the thermal pads are installed, and that the heatsink doesn't touch any electronic components. Especially where the breakouts in the heatsink are. Also check if the screws are tightend and the clamp is locked in place.
When bending the plasic holder be carefull and do not bend them too far as they could break off. If this happens try to repair them using superglue without detaching the plasic holder from the baseboard, as this can lead to a broken baseboard.
To remove a module proceed with the opposite procedure.