137
Servicing Boards and Components
These topics explain how to service field-replaceable units (FRUs) in SPARC
Enterprise T5120 and T5220 servers.
■“Important Safety Instructions” on page 137
■“Servicing DVD/USB Modules” on page 138
■“Servicing Fan Power Boards” on page 143
■“Servicing the Hard Drive Cage” on page146
■“Servicing the Hard Drive Backplane” on page 152
■“Servicing Front Control Panel Light Pipe Assemblies” on page 156
■“Servicing Power Distribution Boards” on page 160
■“Servicing Power Supply Backplanes (SPARCEnterprise T5220 Servers)” on
page167
■“Servicing Paddle Cards” on page 171

Important Safety Instructions

This topic provides a summary of the safety precautions you need to follow when
servicing circuit boards and other components contained the server chassis.
Most components housed within the chassis must never be serviced while power is
present in the chassis. The following table identifies those components.
TABLE: ComponentsThat Require Removal of System Power Before Servicing is
Performed
Component Servicingprocedures
DVD/USB module “Servicing DVD/USB Modules” on page 138
Fan power boards “Servicing Fan Power Boards” on page 143
Harddrive cage “Servicing the HardDrive Cage” on page 146