Lenovo ThinkSystem DM240N, Service Manual, Page: 12 / 34

a. Loop your index fingers through the finger holes of the latching mechanisms on either side of
the NSM module.
Note: If you are removing the bottom NSM module, and if the bottom rail is obstructing
access to the latching mechanisms, place your index fingers through the finger holes from the
inside (by crossing your arms).
b. With your thumbs, press down and hold the orange tabs on top of the latching mechanisms.
The latching mechanisms raise, clearing the latching pins on the shelf.
c. Gently pull forward until the NSM module is about one third of the way out of the shelf, grasp
the NSM module sides with both hands to support its weight, and then place it on a flat stable
surface. When you begin pulling forward, the latching mechanism arms extend from the NSM
module and lock in their fully extended position.
Step 4. Loosen the NSM module cover thumb screw and open the cover.
Note: The FRU label on the NSM module cover shows the location of the five fans, along the rear
wall of the NSM module.
Step 5. Physically identify the failed fan.When a fan fails, the system logs a warning message to the system
console indicating which fan failed. Additionally, the fan attention (amber) LED, located on the
board near the fan slot, illuminates.
Note: The LED for the failed fan remains illuminated for 10 minutes after you remove the NSM
module from the shelf.
Step 6. Replace the failed fan:
a. Remove the failed fan by firmly grasping the sides, where the blue touch points are located,
and then lift it vertically to disconnect it from the socket.
b. Insert the replacement fan by aligning it within the guides, and then push down until the fan
module connector is fully seated in the socket.
Step 7. Close the NSM module cover, and then tighten the thumb screw.
Step 8. Reinsert the NSM module into the shelf:
a. Make sure that the latching mechanism arms are locked in the fully extended position.
b. Using both hands, gently slide the NSM module into the shelf until the weight of the NSM
module is fully supported by the shelf.
c. Push the NSM module into the shelf until it stops (about half an inch from the back of the shelf).
You can place your thumbs on the orange tabs on the front of each finger loop (of the latching
mechanism arms) to push in the NSM module.
d. Loop your index fingers through the finger holes of the latching mechanisms on either side of
the NSM module.
Note: If you are inserting the bottom NSM module, and if the bottom rail is obstructing access
to the latching mechanisms, place your index fingers through the finger holes from the inside
(by crossing your arms).
e. With your thumbs, press down and hold the orange tabs on top of the latching mechanisms.
f. Gently push forward to get the latches over the stop.
g. Release your thumbs from the tops of the latching mechanisms, and then continue pushing
until the latching mechanisms snap into place.The NSM module should be fully inserted into
the shelf and flush with the edges of the shelf.
Step 9. Reconnect the cabling to the NSM module:
a. Reconnect the storage cabling to the same two NSM module ports.Cables are inserted with
the connector pull-tab facing up. When a cable is inserted correctly, it clicks into place.
8
Service Guide for DM240N