Dell PowerEdge B02S Hardware Owner's Manual page 33

Power Distribution Board (PDB)
Replacing Power Distribution Board (PDB)
Follow these instructions to remove the PDB:
CAUTION:
1. Remove all power supplies from the system following the steps outlined in
Power supplies.
2. Loosen and remove the screws securing the middle cover.
Before you remove or install the power distribution board take the steps: 1)
Make sure the system is not turned on or connected to the AC power. 2)
Disconnect all necessary cable connections. Failure to observe these
warnings could result in personal injury or damage to the equipment.
Section-Replacing