Installing System Components 121Power Distribution BoardThe power distribution board is located on your system directly behind thepower supply fan module. See Figure 3-25.Removing the Power Distribution BoardCAUTION: Many repairs may only be done by a certified service technician.You should only perform troubleshooting and simple repairs as authorized inyour product documentation, or as directed by the online or telephone serviceand support team. Damage due to servicing that is not authorized by Dell is notcovered by your warranty. Read and follow the safety instructions that camewith the product.1 Remove the internal hard drive bay and support carrier. See "Removing anInternal Hard Drive Bay" on page 71.2 If applicable, remove the thumb screw on the support bracket and lift it upand out of the system.3 Remove the power supplies from the system. See "Removing a PowerSupply" on page 78.4 Remove the expansion cards. See "Removing an Expansion Card" onpage 92.5 Remove the expansion card riser. See "Removing an Expansion-Card Riser"on page 93.6 Disconnect power distribution cables from the system board (see "SystemBoard" on page 124).7 Disconnect the fan cable.8 Remove the three screws securing the power distribution board to thechassis using the #2 phillips screw driver. See Figure 3-25.9 Pull the blue tab, lift the power distribution board, and move it toward thefront of the system to disengage from the tabs on the power supply bay.See Figure 3-25.
