Lenovo ThinkSystem DM240N User manual

Service Guide for DM240N

First Edition (February 2020)
© Copyright Lenovo 2020.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or soft are is delivered pursuant to a General Services
Administration (GSA) contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-35F-
05925.

Contents
Chapter 1. Hot-swapping a drive . . . . 1
Chapter 2. Hot-swapping a power
supp y . . . . . . . . . . . . . . . . . . 5
Chapter 3. Rep acing a fan . . . . . . . 7
Chapter 4. Rep acing a DIMM . . . . . 11
Chapter 5. Rep acing the rea -time
c ock battery . . . . . . . . . . . . . . 15
Chapter 6. Rep acing an NSM
modu e . . . . . . . . . . . . . . . . . 19
Chapter 7. Hot-removing a drive
she f . . . . . . . . . . . . . . . . . . 23
Appendix A. Contacting Support . . . 25
Appendix B. Notices. . . . . . . . . . 27
Trademarks . . . . . . . . . . . . . . . . 28
© Copyright Lenovo 2020 i

ii Service Guide for DM240N

Chapter 1. Hot-swapping a drive
You can replace a failed drive nondisruptively in an DM240N drive shelf that is po ered on, and hile I/O is
in progress.
Before you begin
• The drive that you are installing must be supported by the DM240N shelf. Lenovo press
• If SED authentication is enabled, you must use the SED replacement instructions in the ONTAP
documentation. Instructions in the ONTAP documentation describe additional steps you must perform
before and after replacing an SED.
ONTAP 9 Lenovo Encryption Po er Guide
• All other components in the system must be functioning properly; if not, contact technical support.
• Verify that the drive you are removing is failed. You can verify that the drive is failed by running the storage
disk show -broken command. The failed drive appears in the list of failed drives. If it does not, you should
ait, and then run the command again.
Note: Depending on the drive type and capacity, it can take up to several hours for the drive to appear in
the list of failed drives.
About this task
• Best practice: The best practice is to have the current version of the Disk Qualification Package (DQP)
installed before hot-s apping a drive. Having the current version of the DQP installed allo s your system
to recognize and use ne ly qualified drives. This avoids system event messages about having noncurrent
drive information and prevention of drive partitioning because drives are not recognized. The DQP also
notifies you of noncurrent drive firm are.
Lenovo Do nloads: Disk Qualification Package
• Best practice: The best practice is to have current versions of NVMe shelf module (NSM) firm are and
drive firm are on your system before replacing FRU components.
Note: Do not revert firm are to a version that does not support your shelf and its components.
Lenovo Do nloads: Disk Shelf Firm are
Lenovo Do nloads: Disk Drive and Firm are
• Drive firm are is automatically updated (nondisruptively) on ne drives that have non current firm are
versions.
Note: Drive firm are checks occur every t o minutes.
• If needed, you can turn on the shelf's location (blue) LEDs to aid in physically locating the affected shelf:
storage shelf location-led modify -shelf-name shelf_name -led-status on If you do not kno the shelf_
name of the affected shelf, run the storage shelf show command.
A shelf has three location LEDs: one on the operator display panel and one on each NSM module.
Location LEDs remain illuminated for 30 minutes. You can turn them off by entering the same command,
but using the off option.
• When you unpack the replacement drive, save all packing materials for use hen you return the failed
drive. You return the failed part to Lenovo as described in the RMA instructions shipped ith the kit. If you
need the RMA number or additional help ith the replacement procedure, contact technical support at
Lenovo Support, 888-463-8277 (North America), 00-800-44-638277 (Europe), or [phone] (Asia/
Pacific).
© Copyright Lenovo 2020 1

A video for this task is available at:
• Youtube: https:// .youtube.com/playlist?list=PLYV5R7hVcs-BhZmHgn868u8QatfgH8JW4
• Youku: https://list.youku.com/albumlist/sho /id_52419127
Step 1. If you ant to manually assign drive o nership for the replacement drive, you need to disable drive
o nership automatic assignment if it is enabled.
Note: You need to manually assign drive o nership if drives in the shelf are o ned by both
controller modules in the HA pair.
Note: You manually assign drive o nership and then reenable drive o nership automatic
assignment later in this procedure.
a. Verify hether drive o nership automatic assignment is enabled: storage disk option show
You can enter the command on either controller module.
If drive o nership automatic assignment is enabled, the output sho s on in the “Auto Assign”
column (for each controller module).
b. If drive o nership automatic assignment is enabled, disable it: storage disk option modify
-node node_name -autoassign off
You must disable drive o nership automatic assignment on both controller modules.
Step 2. Properly ground yourself.
Step 3. Physically identify the failed drive.
When a drive fails, the system logs a arning message to the system console indicating hich
drive failed. Additionally, the attention (amber) LED on the drive shelf operator display panel and the
failed drive illuminate.
Note: The activity (green) LED on a failed drive can be illuminated (solid), hich indicates that the
drive has po er, but should not be blinking, hich indicates I/O activity. A failed drive has no I/O
activity.
Step 4. Remove the failed drive:
a. Press the release button on the drive face to open the cam handle.
b. Slide the drive out of the shelf using the cam handle and supporting the drive ith your other
hand.
Step 5. Wait a minimum of 70 seconds before inserting the replacement drive.
This allo s the system to recognize that a drive as removed.
Step 6. Insert the replacement drive:
a. With the cam handle in the open position, use both hands to insert the replacement drive.
b. Push until the drive stops.
c. Close the cam handle so that the drive is fully seated into the mid plane and the handle clicks
into place.
Be sure to close the cam handle slo ly so that it aligns correctly ith the face of the drive.
Step 7. Verify that the drive's activity (green) LED is illuminated.
When the drive's activity LED is solid, it means that the drive has po er. When the drive's activity
LED is blinking, it means that the drive has po er and I/O is in progress. If the drive firm are is
automatically updating, the LED blinks.
Step 8. If you are replacing another drive, repeat Step 3 on page 2 through Step 7 on page 2.
Step 9. If you disabled drive o nership automatic assignment in Step 1 on page 2 , manually assign drive
o nership, and then reenable drive o nership automatic assignment if needed:
a. Display all uno ned drives: storage disk show -container-type unassigned
You can enter the command on either controller module.
2Service Guide for DM240N

b. Assign each drive: storage disk assign -disk disk_name -owner owner_name
You can enter the command on either controller module.
You can use the ildcard character to assign more than one drive at once.
c. Reenable drive o nership automatic assignment if needed: storage disk option modify -node
node_name -autoassign on
You must reenable drive o nership automatic assignment on both controller modules.
Chapter 1.Hot-s apping a drive 3

4Service Guide for DM240N

Chapter 2. Hot-swapping a power supp y
You can replace a failed po er supply nondisruptively in an DM240N drive shelf that is po ered on, and
hile I/O is in progress.
About this task
• If you are replacing more than one po er supply, you must do so one at a time so that the shelf maintains
po er.
• Best practice: The best practice is to replace the po er supply ithin t o minutes of removal from the
NSM module.If you exceed the t o minutes, the shelf continues to function, but ONTAP sends messages
to the console about the degraded po er supply until the po er supply is replaced.
• Best practice: The best practice is to have current versions of NVMe shelf module (NSM) firm are and
drive firm are on your system before replacing FRU components.
Note: Do not revert firm are to a version that does not support your shelf and its components.
Lenovo Do nloads: Disk Shelf Firm are
Lenovo Do nloads: Disk Drive and Firm are
• If needed, you can turn on the shelf's location (blue) LEDs to aid in physically locating the affected shelf:
storage shelf location-led modify -shelf-name shelf_name -led-status on If you do not kno the shelf_
name of the affected shelf, run the storage shelf show command.
A shelf has three location LEDs: one on the operator display panel and one on each NSM module.
Location LEDs remain illuminated for 30 minutes. You can turn them off by entering the same command,
but using the off option.
• When you unpack the replacement po er supply, save all packing materials for use hen you return the
failed po er supply. You return the failed part to Lenovo as described in the RMA instructions shipped
ith the kit. If you need the RMA number or additional help ith the replacement procedure, contact
technical support at Lenovo Support, 888-463-8277 (North America), 00-800-44-638277 (Europe), or
[phone] (Asia/Pacific).
A video for this task is available at:
• Youtube: https:// .youtube.com/playlist?list=PLYV5R7hVcs-BhZmHgn868u8QatfgH8JW4
• Youku: https://list.youku.com/albumlist/sho /id_52419127
Step 1. Properly ground yourself.
Step 2. Physically identify the failed po er supply.
The system logs a arning message to the system console indicating hich po er supply failed.
Additionally, the attention (amber) LED on the shelf operator display panel illuminates and the
bicolored LED on the failed po er supply illuminates red.
Step 3. Disconnect the po er cord from the po er supply by opening the po er cord retainer, and then
unplug the po er cord from the po er supply. Po er supplies do not have a po er s itch.
Step 4. Remove the failed po er supply:
a. Rotate the cam handle to its open (horizontal) position, and then grasp it.
b. With your thumb, press the blue tab to release the locking mechanism.
c. Pull the po er supply out of the NSM module hile using your other hand to support its
eight.
Step 5. Insert the replacement po er supply:
© Copyright Lenovo 2020 5

a. Using both hands, support and align the edges of the po er supply ith the opening in the
NSM module.
b. Gently push the po er supply into the NSM module until the locking mechanism clicks into
place.
Attention: Do not use excessive force or you might damage the internal connector.
c. Rotate the cam handle to the closed position.
Step 6. Connect the po er cord to the po er supply and secure the po er cord ith the po er cord
retainer. When functioning correctly, a po er supply's bicolored LED illuminates green.
6Service Guide for DM240N

Chapter 3. Rep acing a fan
You can replace a failed fan nondisruptively in an DM240N drive shelf that is po ered on, and hile I/O is in
progress.
Before you begin
• All other components in the system, including the other four fans, must be functioning properly.
• You must have verified that the shelf containing the failed FRU is cabled correctly, by do nloading and
running ThinkSystem Intelligent Monitoring Config Advisor. If any cabling errors are generated, follo the
corrective actions provided.
Lenovo Do nloads: ThinkSystem Intelligent Monitoring Config Advisor
About this task
• Allo at least 70 seconds bet een removal and installation of the NVMe shelf module (NSM).70 seconds
is the time it takes for ONTAP to recover: clean up the data structures and the driver to register the shelf ID
correctly.
• Best practice: The best practice is to have current versions of NVMe shelf module (NSM) firm are and
drive firm are on your system before replacing FRU components.
Note: Do not revert firm are to a version that does not support your shelf and its components.
Lenovo Do nloads: Disk Shelf Firm are
Lenovo Do nloads: Disk Drive and Firm are
• If needed, you can turn on the shelf's location (blue) LEDs to aid in physically locating the affected shelf:
storage shelf location-led modify -shelf-name shelf_name -led-status on If you do not kno the shelf_
name of the affected shelf, run the storage shelf show command.
A shelf has three location LEDs: one on the operator display panel and one on each NSM module.
Location LEDs remain illuminated for 30 minutes. You can turn them off by entering the same command,
but using the off option.
• When you unpack the replacement fan, save all packing materials for use hen you return the failed fan.
You return the failed part to Lenovo as described in the RMA instructions shipped ith the kit. If you need
the RMA number or additional help ith the replacement procedure, contact technical support at Lenovo
Support, 888-463-8277 (North America), 00-800-44-638277 (Europe), or [phone] (Asia/Pacific).
A video for this task is available at:
• Youtube: https:// .youtube.com/playlist?list=PLYV5R7hVcs-BhZmHgn868u8QatfgH8JW4
• Youku: https://list.youku.com/albumlist/sho /id_52419127
Step 1. Properly ground yourself.
Step 2. Disconnect the cabling from the NSM module that contains the FRU that you are replacing:
a. Disconnect the po er cord from the po er supply by opening the po er cord retainer, and
then unplug the po er cord from the po er supply. Po er supplies do not have a po er
s itch.
b. Disconnect the storage cabling from the NSM module ports. Make a note of the NSM module
ports that each cable is connected to. You reconnect the cables to the same ports hen you
reinsert the NSM module, later in this procedure.
Step 3. Remove the NSM module from the shelf:
© Copyright Lenovo 2020 7

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 do n 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 for ard until the NSM module is about one third of the ay out of the shelf, grasp
the NSM module sides ith both hands to support its eight, and then place it on a flat stable
surface. When you begin pulling for ard, the latching mechanism arms extend from the NSM
module and lock in their fully extended position.
Step 4. Loosen the NSM module cover thumb scre and open the cover.
Note: The FRU label on the NSM module cover sho s the location of the five fans, along the rear
all of the NSM module.
Step 5. Physically identify the failed fan.When a fan fails, the system logs a arning message to the system
console indicating hich 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, here 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 ithin the guides, and then push do n until the fan
module connector is fully seated in the socket.
Step 7. Close the NSM module cover, and then tighten the thumb scre .
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 eight 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 do n and hold the orange tabs on top of the latching mechanisms.
f. Gently push for ard 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 ith the edges of the shelf.
Step 9. Reconnect the cabling to the NSM module:
a. Reconnect the storage cabling to the same t o NSM module ports.Cables are inserted ith
the connector pull-tab facing up. When a cable is inserted correctly, it clicks into place.
8Service Guide for DM240N

b. Reconnect the po er cord to the po er supply, and then secure the po er cord ith the
po er cord retainer. When functioning correctly, a po er supply's bicolored LED illuminates
green.
Additionally, both NSM module port LNK (green) LEDs illuminate. If a LNK LED does not
illuminate, reseat the cable.
Step 10. Verify that the attention (amber) LEDs on the NSM module containing the failed fan and the shelf
operator display panel are no longer illuminated.
When the replacement fan reaches its expected RPM speed, the attention LEDs turn off.
Step 11. Verify that the NSM module is cabled correctly.
You can do nload and run ThinkSystem Intelligent Monitoring Config Advisor to verify cabling. If
any cabling errors are generated, follo the corrective actions provided.
Lenovo Do nloads: ThinkSystem Intelligent Monitoring Config Advisor
Chapter 3.Replacing a fan 9

10 Service Guide for DM240N

Chapter 4. Rep acing a DIMM
You can replace a faulty DIMM nondisruptively in an DM240N drive shelf that is po ered on, and hile I/O is
in progress.
Before you begin
• All other components in the system, including the other three DIMMs, must be functioning properly.
• You must have verified that the shelf containing the failed FRU is cabled correctly, by do nloading and
running ThinkSystem Intelligent Monitoring Config Advisor. If any cabling errors are generated, follo the
corrective actions provided.
Lenovo Do nloads: ThinkSystem Intelligent Monitoring Config Advisor
About this task
• Allo at least 70 seconds bet een removal and installation of the NVMe shelf module (NSM).70 seconds
is the time it takes for ONTAP to recover: clean up the data structures and the driver to register the shelf ID
correctly.
• Best practice: The best practice is to have current versions of NVMe shelf module (NSM) firm are and
drive firm are on your system before replacing FRU components.
Note: Do not revert firm are to a version that does not support your shelf and its components.
Lenovo Do nloads: Disk Shelf Firm are
Lenovo Do nloads: Disk Drive and Firm are
• If needed, you can turn on the shelf's location (blue) LEDs to aid in physically locating the affected shelf:
storage shelf location-led modify -shelf-name shelf_name -led-status on If you do not kno the shelf_
name of the affected shelf, run the storage shelf show command.
A shelf has three location LEDs: one on the operator display panel and one on each NSM module.
Location LEDs remain illuminated for 30 minutes. You can turn them off by entering the same command,
but using the off option.
• When you unpack the replacement DIMM, save all packing materials for use hen you return the failed
DIMM. You return the failed part to Lenovo as described in the RMA instructions shipped ith the kit. If
you need the RMA number or additional help ith the replacement procedure, contact technical support
at Lenovo Support, 888-463-8277 (North America), 00-800-44-638277 (Europe), or [phone]
(Asia/Pacific).
A video for this task is available at:
• Youtube: https:// .youtube.com/playlist?list=PLYV5R7hVcs-BhZmHgn868u8QatfgH8JW4
• Youku: https://list.youku.com/albumlist/sho /id_52419127
Step 1. Properly ground yourself.
Step 2. Disconnect the cabling from the NSM module that contains the FRU that you are replacing:
a. Disconnect the po er cord from the po er supply by opening the po er cord retainer, and
then unplug the po er cord from the po er supply. Po er supplies do not have a po er
s itch.
b. Disconnect the storage cabling from the NSM module ports. Make a note of the NSM module
ports that each cable is connected to. You reconnect the cables to the same ports hen you
reinsert the NSM module, later in this procedure.
© Copyright Lenovo 2020 11

Step 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.
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 do n 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 for ard until the NSM module is about one third of the ay out of the shelf, grasp
the NSM module sides ith both hands to support its eight, and then place it on a flat stable
surface. When you begin pulling for ard, the latching mechanism arms extend from the NSM
module and lock in their fully extended position.
Step 4. Loosen the NSM module cover thumb scre and open the cover.
The FRU label on the NSM module cover sho s the location of the four DIMMs, t o on either side
of the heat sink, in the center of the NSM module.
Step 5. Physically identify the faulty DIMM.
When a DIMM is faulty, the system logs a arning message to the system console indicating hich
DIMM is faulty. Additionally, the DIMM attention (amber) LED, located on the board next to the
DIMM slot, illuminates.
Note: The LED for the faulty DIMM remains illuminated for 10 minutes after you remove the NSM
module from the shelf.
Step 6. Replace the faulty DIMM:
a. Note the orientation of the DIMM in the slot so that you can insert the replacement DIMM using
the same orientation.
b. Eject the DIMM from its slot by slo ly pushing apart the ejector tabs at both ends of the DIMM
slot, and then lift the DIMM out of the slot.
Attention: Carefully hold the DIMM by the corners or edges to avoid pressure on the DIMM
circuit board components.
The ejector tabs remain in the open position.
c. Remove the replacement DIMM from its antistatic shipping bag.
d. Hold the DIMM by the corners, and then insert the DIMM squarely into a slot.
The notch on the bottom of the DIMM, among the pins, should line up ith the tab in the slot.
When inserted correctly, the DIMM should go in easily but fit tightly in the slot. If not, reinsert
the DIMM.
e. Push do n carefully, but firmly, on the top edge of the DIMM until the ejector tabs snap into
place over the notches at both ends of the DIMM.
Step 7. Close the NSM module cover, and then tighten the thumb scre .
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 eight 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.
12 Service Guide for DM240N

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 do n and hold the orange tabs on top of the latching mechanisms.
f. Gently push for ard 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 ith the edges of the shelf.
Step 9. Reconnect the cabling to the NSM module:
a. Reconnect the storage cabling to the same t o NSM module ports.Cables are inserted ith
the connector pull-tab facing up. When a cable is inserted correctly, it clicks into place.
b. Reconnect the po er cord to the po er supply, and then secure the po er cord ith the
po er cord retainer. When functioning correctly, a po er supply's bicolored LED illuminates
green.
Additionally, both NSM module port LNK (green) LEDs illuminate. If a LNK LED does not
illuminate, reseat the cable.
Step 10. Verify that the attention (amber) LEDs on the NSM module containing the failed DIMM and the shelf
operator display panel are no longer illuminated.
When the automatic checks are completed on the replacement DIMM, the attention LEDs turn off.
Step 11. Verify that the NSM module is cabled correctly.
You can do nload and run ThinkSystem Intelligent Monitoring Config Advisor to verify cabling. If
any cabling errors are generated, follo the corrective actions provided.
Lenovo Do nloads: ThinkSystem Intelligent Monitoring Config Advisor
Chapter 4.Replacing a DIMM 13

14 Service Guide for DM240N

Chapter 5. Rep acing the rea -time c ock battery
You can replace a failed real-time clock (RTC) battery nondisruptively in an DM240N drive shelf that is
po ered on, and hile I/O is in progress.
Before you begin
• All other components in the system must be functioning properly.
• You must have verified that the shelf containing the failed FRU is cabled correctly, by do nloading and
running ThinkSystem Intelligent Monitoring Config Advisor. If any cabling errors are generated, follo the
corrective actions provided.
Lenovo Do nloads: ThinkSystem Intelligent Monitoring Config Advisor
About this task
• Allo at least 70 seconds bet een removal and installation of the NVMe shelf module (NSM).70 seconds
is the time it takes for ONTAP to recover: clean up the data structures and the driver to register the shelf ID
correctly.
• Best practice: The best practice is to have current versions of NVMe shelf module (NSM) firm are and
drive firm are on your system before replacing FRU components.
Note: Do not revert firm are to a version that does not support your shelf and its components.
Lenovo Do nloads: Disk Shelf Firm are
Lenovo Do nloads: Disk Drive and Firm are
• If needed, you can turn on the shelf's location (blue) LEDs to aid in physically locating the affected shelf:
storage shelf location-led modify -shelf-name shelf_name -led-status on If you do not kno the shelf_
name of the affected shelf, run the storage shelf show command.
A shelf has three location LEDs: one on the operator display panel and one on each NSM module.
Location LEDs remain illuminated for 30 minutes. You can turn them off by entering the same command,
but using the off option.
• When you unpack the replacement RTC battery, save all packing materials for use hen you return the
failed RTC battery. You return the failed part to Lenovo as described in the RMA instructions shipped ith
the kit. If you need the RMA number or additional help ith the replacement procedure, contact technical
support at Lenovo Support, 888-463-8277 (North America), 00-800-44-638277 (Europe), or [phone]-
800 (Asia/Pacific).
A video for this task is available at:
• Youtube: https:// .youtube.com/playlist?list=PLYV5R7hVcs-BhZmHgn868u8QatfgH8JW4
• Youku: https://list.youku.com/albumlist/sho /id_52419127
Step 1. Properly ground yourself.
Step 2. Disconnect the cabling from the NSM module that contains the FRU that you are replacing:
a. Disconnect the po er cord from the po er supply by opening the po er cord retainer, and
then unplug the po er cord from the po er supply. Po er supplies do not have a po er
s itch.
b. Disconnect the storage cabling from the NSM module ports. Make a note of the NSM module
ports that each cable is connected to. You reconnect the cables to the same ports hen you
reinsert the NSM module, later in this procedure.
© Copyright Lenovo 2020 15

Step 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.
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 do n 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 for ard until the NSM module is about one third of the ay out of the shelf, grasp
the NSM module sides ith both hands to support its eight, and then place it on a flat stable
surface. When you begin pulling for ard, the latching mechanism arms extend from the NSM
module and lock in their fully extended position.
Step 4. Loosen the NSM module cover thumb scre and open the cover.
The FRU label on the NSM module cover sho s the location of the RTC battery, near the front of
the NSM module and to the right of the po er supply.
Step 5. Physically identify the failed RTC battery.
The RTC battery attention (amber) LED, located on the board next to the battery slot, illuminates.
Note: The LED for the failed RTC battery remains illuminated for 10 minutes after you remove the
NSM module from the shelf.
Step 6. Replace the RTC battery:
a. Remove the battery by gently pushing it a ay from the holder until it is at an inclined angle
(tilted a ay from the holder), and then lift it out of the holder.
b. Insert the replacement battery into the holder at an inclined angle (tilted a ay from the holder),
push it into an upright position, and then press it firmly into the connector until it is fully seated.
Note: The positive side of the battery, marked ith a plus sign, is oriented out ard (a ay from
the holder), corresponding to the plus sign marked on the NSM module board.
Step 7. Close the NSM module cover, and then tighten the thumb scre .
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 eight 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 do n and hold the orange tabs on top of the latching mechanisms.
f. Gently push for ard 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 ith the edges of the shelf.
Step 9. Reconnect the cabling to the NSM module:
16 Service Guide for DM240N