Installing System Components 149Power Distribution BoardRemoving the Power Distribution BoardCAUTION: Many repairs may only be done by a certified service technician. Youshould only perform troubleshooting and simple repairs as authorized in yourproduct documentation, or as directed by the online or telephone service andsupport team. Damage due to servicing that is not authorized by Dell is not coveredby your warranty. Read and follow the safety instructions that came with theproduct.1 Turn off the system and attached peripherals, and disconnect the systemfrom the electrical outlet.2 Remove the power supplies from the system. See "Removing a PowerSupply" on page 94.3 Open the system. See "Opening the System" on page 84.4 Remove the cooling fan assembly. See "Removing the Cooling FanAssembly" on page 110.5 Disconnect the cable connected to the power distribution board.6 Separate the system board and the I/O board to disengage theinterconnect between the power distribution board and the I/O board:a Slightly lift the tab on the high-speed connector to free the releaselevers. See Figure 3-31.b Push the release levers at an angle of 90 degrees away from theconnector to separate the system board and the power distributionboard from the I/O board. See Figure 3-31.7 Pull the release tab securing the power distribution board and slide theboard upwards. See Figure 3-29.8 Pull the power distribution board up until the securing slots on the boardare free from the tabs on the chassis. See Figure 3-29.
