IBM ThinkPad Z61 Supplementary Manual page 58

Replacing memory
(DRAM) unbuffered small outline dual inline memory module (SO-DIMM),
available as an option, in the memory slot of your computer. SO-DIMMs with
different capacities are available.
Note: Use only the memory types supported by your computer. If you
To install an SO-DIMM, do the following:
1. Touch a metal table or a grounded metal object. This action reduces any
2. Turn off the computer; then disconnect the ac adapter and all cables
3. Close the computer display, and turn the computer over.
4. Remove the battery.
5. Remove the screws that hold the palm rest in place.
50
®
ThinkPad Z61 Series Service and Troubleshooting Guide
incorrectly install the optional memory or install an unsupported
memory type, a warning beep will sound when you try to start the
computer.
static electricity in your body, that could damage the SO-DIMM. Do not
touch the contact edge of the SO-DIMM.
from the computer.