Memory module replacement

The Dual Inline Memory Module (DIMM) card on the motherboard can be replaced on site. The system must be powered down to reseat or replace the memory module.

Replacing the memory module

To replace the memory module (DIMM card) on the motherboard:

1. Verify that the replacement equipment is on site and appears to be in usable condition, with no obvious shipping damage.
2. Reseat the currently installed memory module.
3. Replace the memory module if needed.

Reseat the currently installed memory module

To reseat the memory module and determine if it is faulty:

1. Shut down the system and unplug the AC power cords.
2. Remove the front bezel and top cover.
3. Remove the circuit card hold-down bracket.
4. Locate the memory module (DIMM card) on the motherboard. See:
• MSS standard configuration (internal view)
• MSS high-availability configuration (internal view)
• Messaging Application Server (internal view)
5. Apply pressure to the memory module to ensure that it is properly seated.
6. Press the holding clips toward the memory module to make sure that they are secure.

   Caution! Do not force the memory module into or out of the socket. This can damage the socket, the memory module, or both.

7. Proceed as follows:
1. If the memory module was properly seated, replace it. See Replace the memory module.
2. If the memory module was not properly installed or seated, continue with this procedure to test it.
8. Restore power to the system.
9. Watch the memory test at the beginning of the boot.
1. If the memory test completes, note the amount of memory reported.
2. Press F2 to enter Setup mode and stop the boot.

   Caution! If you miss entering Setup in time to stop the boot, allow the system to become fully operational, and then shut down the system before continuing. Failure to do so can damage data.

10. Shut down the system and unplug the AC power cords.
11. Proceed as follows:
1. If the system shows an amount of memory less than 512 MB or it did not boot, the memory module is not operating correctly. See Replace the memory module.
2. If the system shows 512 MB of memory, the memory module is operating correctly. Continue with this procedure.
12. Replace the circuit card hold-down bracket.
13. Replace the top cover and front bezel.
14. Restore power to the system.
15. Place a test call to the system to verify operation after the system finishes booting. If the system is operating properly, you do not need to replace the memory module.

Replace the memory module

To install a new memory module:

1. Press the holding clips on both sides of the socket outward to release the currently installed memory module. See Removing the memory module.
2. Gently pull the faulty memory module out of the socket.

Caution! The memory module can be damaged by electrostatic discharge. See Protecting against ESD damage for more information.

3. Hold the replacement memory module in the correct orientation over socket DIMM0 (the socket nearest the edge of the board).
4. Gently push the replacement memory module into the DIMM0 socket. When it is seated firmly, the holding clips spring shut to lock it into position. See Installing the memory module.

Caution! Do not force the memory module into or out of the socket. This can damage the socket, the memory module, or both.

5. Replace the circuit card hold-down bracket.
6. Replace the top cover and front bezel.
7. Restore power to the system.
8. Watch the memory test at the beginning of the boot.
1. The system should report 512 MB for a working memory module. Continue with this procedure.
2. If the memory test fails or does not report 512 MB, the memory module is faulty, is not installed correctly, or the slot might be damaged. Return to Reseat the currently installed memory module to try to diagnose the problem.
9. Place a test call to the system to verify operation after the system finishes booting.

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