Dell OptiPlex 7490 All-In-One Service Manual page 4

Installing the coin-cell battery.................................................................................................................................. 38
Wireless card...................................................................................................................................................................... 39
Removing the wireless card......................................................................................................................................39
Installing the wireless card........................................................................................................................................ 40
Camera assembly...............................................................................................................................................................42
Removing the camera assembly.............................................................................................................................. 42
Installing the camera assembly.................................................................................................................................43
Bottom cover..................................................................................................................................................................... 44
Removing the bottom cover..................................................................................................................................... 44
Installing the bottom cover....................................................................................................................................... 45
Power-supply unit............................................................................................................................................................. 46
Removing the power-supply unit (PSU)................................................................................................................46
Installing the power-supply unit (PSU).................................................................................................................. 48
Power-supply fan.............................................................................................................................................................. 50
Removing the PSU fan...............................................................................................................................................50
Installing the PSU fan..................................................................................................................................................51
Heat sink..............................................................................................................................................................................52
Removing the heat sink-UMA............................................................................................................................... 52
Installing the heat sink-UMA................................................................................................................................. 53
Removing the heat sink-discrete..........................................................................................................................54
Installing the heat sink-discrete............................................................................................................................55
Processor............................................................................................................................................................................ 56
Removing the processor............................................................................................................................................56
Installing the processor.............................................................................................................................................. 57
Rear-I/O bracket...............................................................................................................................................................59
Removing the rear-I/O bracket............................................................................................................................... 59
Installing the rear-I/O bracket................................................................................................................................. 60
System board...................................................................................................................................................................... 61
Removing the system board......................................................................................................................................61
Installing the system board....................................................................................................................................... 63
Speakers..............................................................................................................................................................................65
Removing the speakers..............................................................................................................................................65
Installing the speakers................................................................................................................................................66
Power-button board......................................................................................................................................................... 68
Removing the power-button board........................................................................................................................ 68
Installing the power-button board...........................................................................................................................69
Microphones....................................................................................................................................................................... 70
Removing the microphones.......................................................................................................................................70
Installing the microphones..........................................................................................................................................71
Side I/O-board................................................................................................................................................................... 72
Removing the side I/O-board................................................................................................................................... 72
Installing the side I/O-board..................................................................................................................................... 73
Audio board......................................................................................................................................................................... 74
Removing the audio board.........................................................................................................................................74
Installing the audio board...........................................................................................................................................75
Antenna modules............................................................................................................................................................... 76
Removing the antenna modules...............................................................................................................................76
Installing the antenna modules................................................................................................................................. 78
Display panel....................................................................................................................................................................... 79
Removing the display panel.......................................................................................................................................79
4 Contents