IBM System x3800 Problem Determination And Service Manual page 141

Memory card
retention levers
1. Read the safety information that begins on page vii and "Installation guidelines"
on page 113.
2. Turn off the server and peripheral devices, and disconnect the power cords and
all external cables necessary to replace the device.
3. Unlock the front cover (tower model only) and remove the top cover (see
"Removing the top cover, bezel, and front cover" on page 117).
Attention: To ensure proper cooling and airflow, do not operate the server for
more than 2 minutes with the top cover removed.
4. Open the retention levers on the edge of the memory card; then, lift the memory
card out of the server. You must open the large retention lever first.
5. If you are instructed to return the memory card, follow all packaging instructions,
and use any packaging materials for shipping that are supplied to you.
To install the replacement memory card, complete the following steps:
1. Open the retention levers on the memory card; then, while holding the memory
card by the retention levers insert the memory card into the memory card
connector.
2. Press the memory card into the connector and close the retention levers. You
must close the small retention lever first.
3. Install the top cover (tower model only) and lock the front cover (see "Replacing
the top cover, bezel, and front cover" on page 119).
4. Connect the cables and power cords (see "Connecting the cables" on page 116
for cabling instructions).
5. Turn on all attached devices and the server.
Removing and replacing a DIMM
DIMMs must be installed in pairs of the same type and speed. To use the memory
mirroring feature, all the DIMMs that are installed in the server must be of the same
type and speed, and the operating system must support memory mirroring.
Chapter 4. Removing and replacing server components
125