11.2 Troubleshooting the Hardware Box
11.2.1 Overview of field replaceable units (FRUs)
Devices that can be replaced or added in the field are called Field Replaceable Units (FRU). FRUs do not require any soldering and are easy to remove and install. For example, a PCI sound card is considered an FRU. A sound card can be removed with no special tools required.

The following is a list of common FRUs:

  • Monitors
  • Keyboard/ mouse
  • Modular expansion cards
  • Most microprocessors
  • Power Supply
  • RAM: DIMMs, SIMMs, RIMMs, and so on
  • Floppy and fixed disk drives
  • Motherboard