There is one PDECB for each CMIOU. For the locations of the PDECBs in the CMIOU chassis, see CMIOU Chassis Rear Components.
There is one PDECB for the each switch unit (SPARC M7-16). For the locations of the PDECBs in the switch chassis, see Switch Chassis Rear Components (SPARC M7-16)
The replacement procedures are the same for all PDECBs.
Caution - This procedure requires that you handle components that are sensitive to electrostatic discharge. This discharge can cause server components to fail. Follow antistatic precautions to prevent electrostatic damage. See Prevent ESD Damage.
These topics explain how to service a PDECB.