same ports when you reinsert the NSM module, later in this procedure.
3. Remove the NSM module from the shelf:
a. Loop your index fingers through the finger holes of the latching mechanisms on either side of the NSM
module.
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 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, the latching mechanism arms extend from the NSM module and lock in their
fully extended position.
4. Loosen the NSM module cover thumb screw and open the cover.
The FRU label on the NSM module cover shows the location of the RTC battery, near the front of the NSM
module and to the right of the power supply.
5. Physically identify the failed RTC battery.
The RTC battery attention (amber) LED, located on the board next to the battery slot, illuminates.
The LED for the failed RTC battery remains illuminated for 10 minutes after you remove the
NSM module from the shelf.
6. Replace the RTC battery:
a. Remove the battery by gently pushing it away from the holder until it is at an inclined angle (tilted away
from the holder), and then lift it out of the holder.
b. Insert the replacement battery into the holder at an inclined angle (tilted away from the holder), push it
into an upright position, and then press it firmly into the connector until it is fully seated.
The positive side of the battery, marked with a plus sign, is oriented outward (away from
the holder), corresponding to the plus sign marked on the NSM module board.
7. Close the NSM module cover, and then tighten the thumb screw.
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.
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