Step 3. Gently push the battery away from the holder, rotate it away from the holder, and then lift it out of
the holder.
Note: Note the polarity of the battery as you remove it from the holder. The battery is marked with
a plus sign and must be positioned in the holder correctly. A plus sign near the holder tells you how
the battery should be positioned.
Step 4. Remove the replacement battery from the antistatic shipping bag.
Step 5. Locate the empty battery holder in the controller module.
Step 6. Note the polarity of the RTC battery, and then insert it into the holder by tilting the battery at an
angle and pushing down.
Step 7. Visually inspect the battery to make sure that it is completely installed into the holder and that the
polarity is correct.
Reinstalling the controller
After you replace a component within the controller module, you must reinstall the controller module in the
system chassis and boot it.
Step 1. If you are not already grounded, properly ground yourself.
Step 2. If you have not already done so, replace the cover on the controller module.
Step 3. Align the end of the controller module with the opening in the chassis, and then gently push the
controller module halfway into the system.
Note: Do not completely insert the controller module in the chassis until instructed to do so.
Step 4. Recable the system, as needed. If you removed the media converters (SFPs), remember to reinstall
them if you are using fiber optic cables.
Step 5. Complete the reinstallation of the controller module: The controller module begins to boot as soon
as it is fully seated in the chassis. Be prepared to interrupt the boot process.
a. With the cam handle in the open position, firmly push the controller module in until it meets the
midplane and is fully seated, and then close the cam handle to the locked position.
Attention: Do not use excessive force when sliding the controller module into the chassis to
avoid damaging the connectors.
76 ThinkSystem DM3000x and DM5000x Hardware Installation and Maintenance Guide
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