Acer 5620 - Manual (Page 75)

65 Chapter 3
Removing the ODD Module and Dummy Card
1. Slightly pull the ODD module and remove it.
2. Pull the dummy card from the slot and remove it.
Removing the Main Board
1. Disconnect the fan cable.
2. Disconnect the speaker cable and Bluetooth module cable.
3. Remove the four screws securing the main board.
4. Then detach the main board from the lower case.