Dell Precision 7920 Tower - Default Chapter; Table of 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
Contents 3