Replacing SDRAM DIMMs on the memory card assembly

About replacing SDRAM DIMMs

This section provides the supported memory configurations for your gateway and describes the procedures for replacing the SDRAM DIMMs on the memory card assembly.

Replacing the SDRAM DIMMs on the memory card consists of the following procedures:

Supported memory configurations

The following table lists the supported memory configurations for your gateway.

Gateway model	DIMM slots	DIMM group numbers	Required memory configuration
GF920	1-4	Group 1	3.3V, registered, 4 x 512 MB SDRAM DIMMs
GF940	1-4	Group 1	3.3V, registered, 8 x 512 MB SDRAM DIMMs
GF940	5-8	Group 2	3.3V, registered, 8 x 512 MB SDRAM DIMMs
GF960	1-4	Group 1	3.3V, registered, 12 x 512 MB SDRAM DIMMs
	5-8	Group 2
	9-12	Group 3

Note
SDRAM DIMMs are numbered to the right and the left of the DIMM slots on the memory card. The DIMM group numbers appear in smaller print perpendicular to the DIMM slots.

Caution
All DIMMs must be listed on the Approved Parts List. Contact your authorized reseller to obtain this list. Unapproved DIMMs have not been tested for reliability and might cause system downtime.

DIMM locations

Use the following illustration to determine the location of DIMM slot and DIMM group numbers.

Removing an SDRAM DIMM

To remove an SDRAM DIMM, complete the following steps.

Step	Action
1	Open the PCB carrier. Follow the procedure in Opening the PCB carrier.
2	Remove the memory card assembly, as described inRemoving the memory card assembly.
3	Locate the DIMM that you want to remove.
4	Push apart the latches on either side of the DIMM to release the DIMM from its slot, as shown.
5	Pull the DIMM out of the slot.
6	Set the DIMM aside in an antistatic bag.

Installing an SDRAM DIMM

To install an SDRAM DIMM, complete the following steps.

Step	Action
1	Locate the DIMM slot for the DIMM you are installing.
2	Hold the DIMM by its top corners to avoid damaging the components.
3	Insert the DIMM straight into the slot. The DIMM fits tightly in the slot, but should go in easily. If not, realign the DIMM with the slot and try again. Caution Visually inspect the DIMM to verify that it is evenly aligned and fully inserted into the slot; otherwise, the edge connector on the DIMM does not make complete contact with the slot.
4	Push carefully, but firmly on the top edge of the DIMM until the latches snap into place.
5	Install the memory card assembly, as described in Installing the memory card assembly.
6	Go to Closing the PCB carrier.
7	After turning on your system, run diagnostics on the SDRAM DIMMs. See the Diagnostics Guide for more information.