Dell Latitude D400 Service Manual page 25

Installing a Memory Module Under the Keyboard
1. Remove the keyboard.
2. Loosen the two captive screws in the cover labeled "DIMM1."
1 captive screws (2)
2 DIMM1 cover 2X386
3 memory module See Mini RSL
4 securing clips (2)
5 securing tabs (3)
NOTICE: To prevent damage to the memory module connector, do not use tools to spread the memory-module securing clips.
3. If you are replacing a memory module, remove the existing module:
a. Use your fingertips to carefully spread apart the securing clips on each end of the memory module connector until the module pops up.
b. Remove the module from the connector.
4. Ground yourself and install the new memory module:
a. Align the notch in the module edge connector with the tab in the connector slot.
b. Slide the module firmly into the slot at a 45-degree angle, and rotate the module down until it clicks into place. If you do not feel the click, remove
the module and reinstall it.
NOTE: If the memory module is not installed properly, the computer may not boot properly. No error message indicates this failure.
5. Insert the three securing tabs on the DIMM1 cover into the notches above the memory module connector and tighten the captive screws.
NOTICE: If the DIMM1 cover is difficult to replace, remove the module and reinstall it. Forcing the cover to close may damage your computer.
6. Replace the keyboard.
7. Insert the battery into the battery bay, or connect the AC adapter to your computer and an electrical outlet.
8. Turn on the computer.
As the computer boots, it detects the additional memory and automatically updates the system configuration information. You may have to press <F1> to
acknowledge that you have added additional memory.
To confirm the amount of memory installed in the computer: