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You need to handle ESD sensitive items in an ESD Protected Area (EPA) which can be very simple or quite elaborate. The key rules are to ground all conductors including people and to remove all insulators from the EPA.
This can be accomplished by using a Field Service Kit which includes a Wrist Strap for the person to be grounded and a worksurface which also needs to be attached to ground using a ground wire. Note: a common mistake is to lay the ESD sensitive item on shielding bags; it’s ESD packaging but typically much higher resistance than a worksurface should be.
For a workbench to be a ESD Protected Workstation, you need:
If the person is sitting, he is to be grounded via a ground cord. Alternatively the person can wear ESD Foot Grounders on a grounded floor mat, but it is not necessary. If the carpet is high charging, a low charging antistatic mat would help.
ESD packaging with the ESD control property shielding is required to transport ESD sensitive items outside the EPA. However, since when you reassemble and close the computer, it is not ESD sensitive, you may not require any packaging. If an ESD sensitive is defective, it is recommended that it be protected by ESD packaging so if not to be discarded additional ESD damage does not occur. See various sizes of Statshield® Metal In ESD Bags.