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### List of Customer Replaceable Units and Field Replaceable Units

The replaceable components in your Sun Fire X4640 server are designated as either field-replaceable units (FRU) or customer-replaceable units (CRU). A part designated as a FRU must be replaced by a Sun-qualified service technician. A part designated as a CRU can be replaced by a person who is not a Sun-qualified service technician.

CRU Components | Replacement Procedures
--- | ---
System CMOS battery | Replacing the CMOS Battery (CRU)
Hard drive | Replacing or Adding a Hard Drive (CRU)
CPU module or filler card | Replacing a CPU Module and Filler Card (CRU)
DIMM | Replacing or Adding DIMMs (CRU)
PCI card | Replacing or Adding PCI Cards (CRU)
Power supply | Replacing or Adding a Power Supply (CRU)
Fan tray | Replacing the Fan Tray (CRU)

FRU Components | Replacement Procedures
--- | ---
Service processor board | Replacing the Service Processor Board (FRU)
DVD module | Replacing the DVD Module (FRU)
Power distribution board | Replacing the Power Distribution Board (FRU)
Fan tray carriage | Replacing the Fan Tray Carriage (FRU)
Front panel indicator board | Replacing the Front Panel Indicator Board (FRU)
Front I/O board | Replacing the Front I/O Board (FRU)
Hard disk backplane | Replacing a Hard Disk Backplane (FRU)
Motherboard | Replacing the Motherboard (FRU)

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