ADLINK Express-HL2 - Manual (Page 81)

Express-HL2 Page 81
Step 4: Use the four M2.5, L=6mm screws provided to fasten the heatsink to the module.
Step 5: Place the COM Express module and heatsink assembly onto the connectors on the carrier board as shown.
Then press down on the module until it is firmly seated on the carrier board.
Step 6: Use the five M2.5, L=16mm screws provided to secure the COM Express module to the carrier board from the solder side.
Step 7: If you are installing a heatsink with a fan, plug the fan connector into the carrier board as shown.