Nokia 500s Installation Guide 998 Installing and Replacing OtherComponentsThis chapter provides information about how to add or replace field-replaceable units (FRUs) other than network interface cards (NICs) in yourNokia 500s appliance. The following topics are covered: Replacing a Hard Disk drive Replacing or Upgrading Memory Installing a Nokia Encryption Accelerator Card Installing a Fan Unit Installing or Replacing a Power Supply Monitoring the Nokia 500s Appliance Power SupplyFor information about how to add or replace NICs, see Chapter 4, “Installingand Replacing Network Interface Cards.”You should have a working knowledge of networking equipment before youattempt to service a 500s appliance. Limit service of the appliance to theprocedures described in this chapter.CautionTo protect the 500s appliance and the memory modules fromelectrostatic discharge damage, make sure you are properlygrounded before you touch these components. Use a groundingwrist strap and follow the instructions provided with the wrist strap