146 | Installing System ComponentsRemoving the Sensor Board for 2.5” Hard Drive SystemCAUTION: 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 notcovered by your warranty. Read and follow the safety instructions that came withthe product.1 Turn off the system, including any attached peripherals, anddisconnect the system from the electrical outlet.2 Remove all the hard drives. See "Removing a Hard-Drive Carrier" onpage 81.3 Open the system. See "Opening the System" on page 117.4 Disconnect all the cables from the backplane. See Figure 5-5 for 2.5 "hard drives.Note the routing of the cable underneath the tabs on the chassis as youremove them from the system. You must route these cables properlywhen you replace them to prevent the cables from being pinched orcrimped.5 Disconnect front panel cables from the fan controller board. See Figure5-11.Note the routing of the cable underneath the tabs on the chassis as youremove them from the system. You must route these cables properlywhen you replace them to prevent the cables from being pinched orcrimped.6 Remove the hard-drive cage from the chassis. See Figure 3-32.7 Disconnect the cable from the sensor-board assembly. See Figure 5-13.8 Remove the screws that secure the sensor-board assembly to the hard-drive cage. See Figure 3-41.9 Remove the sensor-board assembly from the hard-drive cage. SeeFigure 3-41.
