Dell Vostro 1520 (Early 2009) - Manual (Page 46)

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Memory
Dell™ Vostro™ 1520 Service Manual
Removing Memory Modules
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the battery from the computer.
3. Remove the processor and memory access panel from the computer.
4. Using your fingertips, carefully spread apart the securing clips on each end of the memory module connector until the memory module pops up.
WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best
practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance.
NOTE: DIMM A is the module closest to the system board. You cannot remove DIMM A until DIMM B is removed. If only 1 DIMM is installed, it should
always be installed in the DIMM A slot. If only 1 DIMM is installed, moving memory from DIMM A to DIMM B will disable AMT (if currently enabled).