Dell Precision M40 - Manual (Page 25)

5. Pull the fan assembly away from the back-panel bracket.
RJ-11/RJ-45 Board
RJ-11 and RJ-45 Connector Covers
Removing the Protective Covers From the RJ-11 and RJ-45 Connectors
Remove a plastic connector cover (if necessary) by slipping a nonmarring tool into the cutout at the top and pivoting the tool up to disengage the inner
securing tab.
To replace a connector cover, orient the cover notch-side-up and snap it into the connector cutout.
RJ-11/RJ-45 Board
Removing the RJ-11/RJ-45 Board
1. Follow the instructions in " Preparing to Work Inside the Computer ."
2. Remove the system board .
3. Remove the 4-mm screw from the RJ-11/RJ-45 board.
4. Reach into the enclosure and, while pulling the tall plastic tab away from the board assembly to release it, lift out the assembly.
When replacing the RJ-11/RJ-45 board assembly, protect the wiring harness by routing it between the plastic posts.
NOTICE: When reconnecting the fan cables, connect the shorter cable to the connector closest to the fan assembly. Route both cables so that they will
not be pinched by the thermal cooling assembly.
NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.
NOTICE: The plastic tab is fragile; pull it back only far enough to remove the board assembly.