Dell Precision 7920 Tower Owners Manual - Page 3

Contents 1 Chassis...7 Front view...7 Back view...8 Internal view...9 Major components of your system ...12 2 Working on your computer...14 Safety instructions...14 Turning off your computer - Windows...14 Before working inside your computer...15 After working inside your computer...15 3 Removing and installing components 16 Screw size list...16 Recommended tools...17 Power supply unit (PSU)...18 Removing the PSU...18 Installing the PSU...18 Side cover...18 Removing the side cover...18 Installing the side cover...19 Air shroud...20 Removing the air shroud...20 Installing the air shroud fan assembly...20 Removing the air shroud fan...20 Installing the air shroud fan...22 Front bezel...22 Removing the front bezel...22 Installing the front bezel...23 PCIe holder...24 Removing PCIe card holder ...24 Installing the PCIe card holder...25 Intrusion switch...25 Removing the intrusion switch...25 Installing the intrusion switch...27 Front system fan assembly...27 Removing the front system fan assembly...28 Installing the front system fan assembly...31 Internal chassis speaker...31 Removing the internal chassis speaker...31 Installing the internal chassis speaker...32 Hard disk drive and the Optical disk drive bezel...33 Removing the HDD bezel...33 Installing the HDD bezel...33 Contents 3