Acer Aspire 1511 and RAM expansion

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Hi all,
I have Acer Aspire 1511 with 512MB RAM in two slots (256MB+256MB).
I will install a module 1GB; I must uninstall one module of 256MB.
Well !
I ask you how to extract the module:
- is sufficient open tap of RAM box or I must disassemble further notebook?
- where I can download a service manual of notebook?

Thank you in advance!

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