Sony PCG-K215B Hardware Manual page 77

8 Remove the new memory module from its packaging.
9
Install the memory module by sliding it into the memory module slot, as shown.
10 Press the module into place until it clicks.
!
Please do not touch any other board than the memory modules.
!
If you only place 1 memory module, please put the module to the slot, as shown in the illustration below.
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Upgrading your VAIO computer