Dell OptiPlex All-in-One Plus 7420 Owners Manual
Dell OptiPlex All-in-One Plus 7420 Manual
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- Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 1
OptiPlex All-in-One Plus 7420 Owner's Manual Regulatory Model: W31C Regulatory Type: W31C002 March 2024 Rev. A01 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 2
use of your product. CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem. WARNING: A WARNING indicates a potential for property damage, personal injury, or death. © 2024 Dell Inc. or its subsidiaries. All rights reserved. Dell - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 3
Contents Chapter 1: Views of OptiPlex All-in-One Plus 7420 7 Right...7 Left...8 Front...9 Retractable camera ...10 Bottom...12 Back panel...13 Service Tag...14 Chapter 2: Set up your computer 15 Chapter 3: Specifications of OptiPlex All-in-One Plus 7420 20 Dimensions and weight...20 Processor... - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 4
Recommended tools...35 Screw list...36 Major components of your OptiPlex All-in-One Plus 7420 37 Chapter 5: Removing and installing Customer Replaceable Units (CRUs 40 Stand...40 Removing the stand...40 Installing the stand...41 Back cover...43 Removing the - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 5
7: Software...110 Operating system...110 Drivers and downloads...110 Chapter 8: BIOS Setup...111 Entering BIOS setup program...111 Navigation keys...111 F12 One Time Boot menu...111 System setup options...112 Updating the BIOS...125 Updating the BIOS in Windows...125 Updating the BIOS using the USB - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 6
an existing system setup password 127 Clearing CMOS settings...127 Clearing BIOS (System Setup) and System passwords 127 Chapter 9: Troubleshooting...129 Dell SupportAssist Pre-boot System Performance Check diagnostics 129 Running the SupportAssist Pre-Boot System Performance Check 129 Power - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 7
1 Views of OptiPlex All-in-One Plus 7420 Right Figure 1. Right view of OptiPlex All-in-One Plus 7420 1. USB 3.2 Gen 2 (10 Gbps) with PowerShare port Connect devices such as external storage devices, printers, and external displays. Provides a data transfer speed of up to 10 Gbps. Supports Power - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 8
2. Left view of OptiPlex All-in-One Plus 7420 1. Storage drive activity light The activity light turns on when the computer reads from or writes to storage drives. 2. Universal audio port Connect headphones or a headset (headphone and microphone combo). 8 Views of OptiPlex All-in-One Plus 7420 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 9
Front Figure 3. Front view of OptiPlex All-in-One Plus 7420 1. Left microphone Provides digital sound input for audio recording and voice calls. 2. Right microphone use. 4. Right speaker Provides audio output. 5. Left speaker Provides audio output. Views of OptiPlex All-in-One Plus 7420 9 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 10
the retractable camera NOTE: Depending on the configuration ordered your computer may have a 5MP RGB + Infrared camera or an FHD RGB camera. 10 Views of OptiPlex All-in-One Plus 7420 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 11
infrared light, which enables the infrared camera to sense and track motion. 5. Camera-status light Turns on when the camera is in use. Views of OptiPlex All-in-One Plus 7420 11 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 12
you to video chat, capture photos, and record videos. 2. Camera-status light Turns on when the camera is in use. Bottom Figure 7. Bottom view of OptiPlex All-in-One Plus 7420 12 Views of OptiPlex All-in-One Plus 7420 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 13
connection for use in standard environmental conditions, or one of the stands offered by Dell for your OptiPlex All-in-One Plus 7420. 2. Service Tag label The Service Tag is a unique alphanumeric identifier that enables Dell service technicians to identify the hardware components in your computer - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 14
Service Tag The service tag is a unique alphanumeric identifier that allows Dell service technicians to identify the hardware components in your computer and access warranty information. Figure 9. Service tag location of your OptiPlex All-in-One Plus 7420 14 Views of OptiPlex All-in-One Plus 7420 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 15
2 Set up your computer Steps 1. Install the stand base on the stand. NOTE: Stand base installation for all stand configurations offered for your computer is exactly the same. Follow the procedure shown in the image to install the stand base on the stand. Figure 10. Installing the stand base 2. Set - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 16
Figure 11. Installing the stand 3. Set up the keyboard and mouse. NOTE: For setup instructions, see the documentation shipped with the keyboard and mouse. 4. Connect the power cable. 16 Set up your computer - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 17
Figure 12. Connecting the power cable 5. Press the power button to turn on your computer. Set up your computer 17 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 18
more information about installing and configuring Ubuntu, see the knowledge base articles 000131655 and 000131676 at www.dell.com/support. For Windows: Follow the on-screen instructions to complete the setup. When setting up, Dell recommends that you: ● Connect to a network for Windows updates. NOTE - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 19
prevents security threats, monitors, and detects hardware failures. For more information, see SupportAssist for Home PCs User's Guide at www.dell.com/ support/home/product-support/product/dell-supportassist-pcs-tablets/docs. NOTE: In SupportAssist, click the warranty expiry date to renew or upgrade - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 20
lists the height, width, depth, and weight of your OptiPlex All-in-One Plus 7420. Table 2. Dimensions and weight Description Height: Front height Values table lists the details of the processors supported by your OptiPlex All-in-One Plus 7420. 20 Specifications of OptiPlex All-in-One Plus 7420 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 21
36 MB Intel UHD Graphics Intel UHD 770 Graphics 770 Chipset The following table lists the details of the chipset that is supported for your OptiPlex All-in-One Plus 7420. Table 4. Chipset Description Chipset Values Q670 Processor Intel Core i3/i5 vPro/i7 vPro/i9 vPro DRAM bus width 64-bit - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 22
releases from Microsoft. For additional information about N-2 and 5-year Windows operating system supportability, see the Dell Windows as a Service (WaaS), at Dell support site. EOML 411 The OptiPlex All-in-One Plus 7420 continues to test the coming Semi-Annual Channel Windows 11 version releases - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 23
Values ● One M.2 2230 slot for WiFi and Bluetooth combo card ● Two M.2 2230/2280 slots for solid-state drive NOTE: To learn more about the features of different types of M.2 cards, search in the Knowledge Base Resource at www.dell.com/support. Specifications of OptiPlex All-in-One Plus 7420 23 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 24
. Audio The following table lists the audio specifications of your OptiPlex All-in-One Plus 7420. Table 10. Audio specifications Description Audio controller Values Realtek ALC3289 Stereo conversion Supported Internal audio interface High definition audio interface External audio interface - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 25
in the retractable-camera assembly Storage This section lists the storage options on your OptiPlex All-in-One Plus 7420. Your OptiPlex All-in-One Plus 7420 supports one of the following storage configurations: ● One M.2 2230/2280 solid-state drive ● Up to two M.2 2230/2280 solid-state drives The - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 26
only on computers with an infrared camera Power ratings The following table lists the power rating specifications of OptiPlex All-in-One Plus 7420. Table 14. Power ratings Description Type Option one Option two 160 W internal power supply unit (PSU), 240 W internal power supply unit (PSU), 85 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 27
the display specifications of your OptiPlex All-in-One Plus 7420. Table 16. Display specifications Description Display type Option one Option two Full High Definition (FHD), ComfortView Full High Definition (FHD), ComfortView Plus Plus Touch options No Touch support, with 10 touch points - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 28
Table 16. Display specifications (continued) Description Option one Megapixels 2.07 Color gamut 99% (sRGB) Pixels Per Inch (PPI) 92 Contrast ratio (minimum) ● 700 components, search about it in the Knowledge Base Resource at Dell Support. 28 Specifications of OptiPlex All-in-One Plus 7420 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 29
table lists the specifications of the integrated Graphics Processing Unit (GPU) supported by your OptiPlex All-in-One Plus 7420. Table 17. GPU-Integrated Controller External display support Memory size Processor Intel UHD Graphics 730 ● One DisplayPort++ 1.4a port (5120 x 3200 at 60 Hz - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 30
The following table lists the environmental specifications of your OptiPlex All-in-One Plus 7420. Table 20. Environmental Feature Recyclable packaging Values Yes BFR/PVC-free chassis Yes Vertical orientation packaging support Yes Multi-Pack packaging No Energy-Efficient Power Supply - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 31
may impact the performance of specific components. * Measured using a random vibration spectrum that simulates the user environment. † Measured using a 2 ms half-sine pulse. Specifications of OptiPlex All-in-One Plus 7420 31 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 32
and the contacts. CAUTION: You should only perform troubleshooting and repairs as authorized or directed by the Dell technical assistance team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. See the safety instructions that is shipped with the product or at - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 33
taken before performing any disassembly instructions. Observe the following safety electrical potential. This is done by using a field service electrostatic discharge (ESD) kit. When connecting a bonding that may not be obvious, such as intermittent problems or a shortened product life span. As the - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 34
damage to recognize and troubleshoot is the intermittent ( ESD mat, and the hardware is known as bonding. Use only Field Service kits with a wrist strap, mat, and bonding wire. Never use check with your regional office to find out if they have one. To perform the test, plug the bonding-wire of wrist - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 35
parts separate from all insulator parts while performing service and use anti-static bags for transporting sensitive for a stable base, and point your toes out. 2. Tighten stomach muscles. Abdominal muscles support your spine when you lift, offsetting the force of the load. 3. Lift with your legs - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 36
● Phillips screwdriver #1 ● Plastic scribe Screw list NOTE: When removing screws from a component, it is recommended to note the screw type, the quantity of screws, and then place them in a screw storage box. This is to ensure that the correct number of screws and correct screw type is restored - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 37
-button and I/O board M3x5 3 shield Power-button and I/O board M3x5 2 Audio board shield M3x5 3 Audio board M3x5 2 Major components of your OptiPlex All-in-One Plus 7420 The following image shows the major components of your OptiPlex All-in-One Plus 7420. Working inside your computer 37 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 38
Figure 14. Major components of your OptiPlex All-in-One Plus 7420 1. Stand 2. Bottom cover 3. Antenna modules 4. Heat sink 5. Processor 6. Fan 7. M.2 2280 solid-state drive 8. Memory module 9. M.2 2230 solid-state drive 10. Wireless card 11. Audio board - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 39
19. Speakers 20. Power-supply unit (PSU) 21. Fan shroud 22. Coin-cell battery 23. System board 24. System-board shield 25. Retractable-camera assembly 26. Power-supply fan 27. Back cover NOTE: Dell provides a list of components and their part numbers for the original configuration purchased. These - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 40
5 Removing and installing Customer Replaceable Units (CRUs) The replaceable components in this chapter are Customer Replaceable Units (CRUs). CAUTION: Customers can replace only the Customer Replaceable Units (CRUs) following the safety precautions and replacement procedures. NOTE: The images in - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 41
Figure 16. Removing the Fixed Stand Steps 1. Place the display-assembly base on a clean and flat surface. 2. Press and hold down on the tab that secures the stand to the display-assembly base. 3. Slide and lift the stand off the display-assembly base. Installing the stand Prerequisites If you are - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 42
Figure 17. Installing the Height Adjustable Stand (HAS) Figure 18. Installing the Fixed Stand Steps 1. At an angle, align the tabs on the stand with the slots on the display-assembly base. 2. Slide the tabs on the stand into the slots on the display-assembly base. 42 Removing and installing - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 43
Next steps 1. Follow the procedure in After working inside your computer. Back cover Removing the back cover Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. About this task NOTE: Before removing the base cover, ensure that there is no SD card - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 44
About this task The following image indicates the location of the back cover and provides a visual representation of the installation procedure. Figure 20. Installing the back cover Steps 1. Align the back cover to the display-assembly base. 2. Place and slide the back cover into place on the - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 45
Figure 21. Removing the memory Steps 1. Using the tab on the DIMM door, pry open and lift the DIMM door on the system-board shield to access the memory slots. 2. Using your fingertips, carefully spread apart the securing clips on each end of the memory-module slot until the memory module pops out. - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 46
Figure 22. Installing the memory Steps 1. Align the notch on the memory module with the tab on the memory-module slot. 2. Slide the memory module firmly into the slot at an angle and press down on the memory module down until it clicks into place. NOTE: If you do not hear the click, remove the - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 47
Graphics card Removing the graphics card Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the back cover. About this task The following image indicates the location of the graphics card and provides a visual representation of the removal - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 48
Figure 23. Removing the graphics card Steps 1. Remove the two screws (M3x5) that secure the graphics-card assembly to the display-assembly base. 2. Slide and lift the graphics-card assembly off the display-assembly base. 48 Removing and installing Customer Replaceable Units (CRUs) - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 49
3. Using the tab on the DGFX door, pry open and lift the DGFX door on the graphics-card shield to access the graphics-card fan connector. 4. Disconnect the graphics-card fan from the graphics card. 5. Flip over the graphics-card assembly. 6. Remove the two screws (M2.5x5) that secure the graphics - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 50
Figure 24. Installing the graphics card Steps 1. Align the notch on the memory module with the tab on the memory-module slot 2. Slide the memory module firmly into the slot at an angle and press down on the memory module down until it clicks into place. 50 Removing and installing Customer - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 51
NOTE: If you do not hear the click, remove the memory module and reinstall it again. NOTE: Repeat steps 1 to 2 for each memory module to be installed on your computer. 3. Close the DIMM door and press it into place, securing it. Next steps 1. Install the back cover. 2. Install the stand. 3. Follow - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 52
Figure 25. Removing the system-board shield Steps 1. Remove the six screws (M3x5) that secure the system-board shield to the display-assembly base. 2. Lift the system-board shield off the display-assembly base. Installing the system-board shield Prerequisites If you are replacing a component, remove - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 53
Figure 26. Installing the system-board shield Steps 1. Place the system-board on the display-assembly base. 2. Align the screw holes on the system-board shield with the screw holes on the display-assembly base. 3. Replace the six screws (M3x5) that secure the system-board shield to the display- - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 54
About this task The following image indicates the location of the wireless card and provides a visual representation of the removal procedure. Figure 27. Removing the wireless card Steps 1. Remove the screw (M2x3.5) that secures the wireless-card bracket to the wireless card. 2. Lift the wireless- - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 55
Figure 28. Installing the wireless card Steps 1. Connect the antenna cables to the wireless card. Table 23. Antenna-cable color scheme Connector on the wireless card Antenna-cable color Silkscreen marking Main White MAIN Auxiliary Black AUX △ (white triangle) ▲ (black triangle) 2. Place - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 56
3. Install the stand. 4. Follow the procedure in After working inside your computer. Solid-state drive in M.2 slot 0 Removing the M.2 2230 solid-state drive in M.2 slot 0 Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the back cover. 4. - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 57
Installing the M.2 2230 solid-state drive in M.2 slot 0 Prerequisites If you are replacing a component, remove the existing component before performing the installation process. About this task NOTE: This procedure is only applicable if you are installing an M.2 2230 solid-state drive into the solid - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 58
2. Remove the stand. 3. Remove the back cover. 4. Remove the system-board shield. About this task NOTE: Depending on the configuration ordered, your computer may have up to two M.2 2230 or 2280 solid-state drives installed in the solid-state drive slots on the system board. NOTE: This procedure is - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 59
Figure 32. Installing the M.2 2280 solid-state drive in M.2 slot 0 Steps 1. Align the notch on the M.2 2280 solid-state drive with the tab on the solid-state drive slot (M.2 PCIe SSD 0). 2. Slide the M.2 2280 solid-state drive into the solid-state drive slot (M.2 PCIe SSD 0) on the system board. 3. - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 60
Figure 33. Moving the solid-state screw mount on M.2 slot 0 Steps 1. Remove the screw mount on the system board. 2. Install the screw mount on the system board. Next steps 1. Install the M.2 2230 solid-state drive in slot 0 or the M.2 2280 solid-state drive in slot 0, whichever is applicable. 2. - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 61
Figure 34. Removing the M.2 2230 solid-state drive in M.2 slot 1 Steps 1. Remove the screw (M2x3.5) that secures the M.2 2230 solid-state drive to the system board. 2. Slide and lift the M.2 2230 solid-state drive from the solid-state drive slot (M.2 PCIe SSD 1) on the system board. Installing the - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 62
Figure 35. Installing the M.2 2230 solid-state drive in M.2 slot 1 Steps 1. Align the notch on the M.2 2230 solid-state drive with the tab on the solid-state drive slot (M.2 PCIe SSD 1). 2. Slide the M.2 2230 solid-state drive into the solid-state drive slot (M.2 PCIe SSD 1) on the system board. 3. - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 63
Figure 36. Removing the M.2 2280 solid-state drive in M.2 slot 1 Steps 1. Remove the screw (M2x3.5) that secures the M.2 2280 solid-state drive to the system board. 2. Slide and lift the M.2 2280 solid-state drive from the solid-state drive slot (M.2 PCIe SSD 1) on the system board. Installing the - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 64
Figure 37. Installing the M.2 2280 solid-state drive in M.2 slot 1 Steps 1. Align the notch on the M.2 2280 solid-state drive with the tab on the solid-state drive slot (M.2 PCIe SSD 1). 2. Slide the M.2 2280 solid-state drive into the solid-state drive slot (M.2 PCIe SSD 1) on the system board. 3. - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 65
Figure 38. Moving the solid-state screw mount on M.2 slot 1 Steps 1. Remove the screw mount on the system board. 2. Install the screw mount on the system board. Next steps 1. Install the M.2 2230 solid-state drive in slot 1 or the M.2 2280 solid-state drive in slot 1, whichever is applicable. 2. - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 66
Figure 39. Removing the coin-cell battery Steps 1. Push the release lever on the coin-cell battery socket (RTC) to release the coin-cell battery out of the socket. 2. Lift the coin-cell battery from the coin-cell battery socket. Installing the coin-cell battery Prerequisites If you are replacing a - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 67
Figure 40. Installing the coin-cell battery Steps With the positive side (+) facing up, insert the coin-cell battery into the battery socket (RTC) on the system board and snap the battery into place. Next steps 1. Install the system-board shield. 2. Install the back cover. 3. Install the stand. 4. - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 68
Figure 41. Removing the I/O cover Steps 1. Remove the two screws (M3x5) that secure the I/O cover to the display-assembly base. 2. Lift the I/O cover off the display-assembly base. Installing the I/O cover Prerequisites If you are replacing a component, remove the existing component before - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 69
Figure 42. Installing the I/O cover Steps 1. Place the I/O cover on the display-assembly base. 2. Align the I/O slots with the I/O ports and the screw holes on the I/O cover with the screw holes on the display-assembly base. 3. Replace the two screws (M3x5) that secure the I/O cover to the display- - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 70
Figure 43. Removing the bottom cover Steps 1. Remove the three screws (M3x5) that secure the bottom cover to the display-assembly base. 2. Lift the bottom cover off the display-assembly base. Installing the bottom cover Prerequisites If you are replacing a component, remove the existing component - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 71
Figure 44. Installing the bottom cover Steps 1. Place and align the bottom cover with the display-assembly base. 2. Align the screw holes on the bottom cover with the screw holes on the display-assembly base. 3. Replace the three screws (M3x5) that secure the bottom cover to the display-assembly - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 72
Figure 45. Removing the retractable-camera assembly Steps 1. Remove the two screws (M3x5) that secure the camera-assembly bracket to the display-assembly base. 2. Lift the camera-assembly bracket off the display-assembly base. 3. Using the pull tab, disconnect the camera cable from its connector ( - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 73
Figure 46. Installing the retractable-camera assembly Steps 1. Slide the retractable-camera assembly under the heat sink into its slot on the display-assembly base. 2. Align the screw holes on the retractable-camera assembly with the screw holes on the display-assembly base. 3. Replace the two - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 74
clip and disconnect the processor-power cable from its connector (ATX CPU) on the system board. 2. Remove the processor-power cable from the routing guide on the display-assembly base. 3. Lift the processor-power cable from the system board to access the fan cable. 4. Remove the three screws (M3x5 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 75
display-assembly base. 4. Connect the fan cable to its connector (CPU FAN) on the system board. 5. Route the processor-power cable through the routing guide on the display-assembly base. 6. Connect the processor-power cable to its connector (ATX CPU) on the system board. Next steps 1. Install the - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 76
Power-supply unit Removing the power-supply unit Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the back cover. 4. Remove the system-board shield. 5. Remove the I/O cover. About this task The following image indicates the location of the - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 77
Steps 1. Press and hold the securing clip and disconnect the processor-power cable from its connector (ATX CPU) on the system board. 2. Disconnect the control-signal cable from its connector (CTRL) on the system board. 3. Disconnect the system-board power cable from its connector (ATX SYS) on the - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 78
Steps 1. Place the power-supply unit and the power-supply unit connector on the display-assembly base. 2. Align the screw holes on the power-supply unit with the screw holes on the display-assembly base. 3. Replace the three screws (M3x5) that secure the power-supply unit to the display-assembly - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 79
technicians only. CAUTION: To avoid any potential damage to the component or loss of data, ensure that an authorized service technician replaces the Field Replaceable Units (FRUs). CAUTION: Dell Technologies recommends that this set of repairs, if needed, to be conducted by trained technical repair - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 80
Figure 51. Removing the power-supply fan 80 Removing and installing Field Replaceable Units (FRUs) - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 81
Figure 52. Removing the power-supply fan Removing and installing Field Replaceable Units (FRUs) 81 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 82
from its connector (FAN SYS) on the system board. 2. Remove the power-supply fan cable from the routing guides on the display-assembly base. 3. Remove the audio-board cable from the routing guides on the display-assembly base and the power-supply fan. 4. Remove the antenna cables from the routing - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 83
Figure 54. Installing the power-supply fan Removing and installing Field Replaceable Units (FRUs) 83 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 84
Figure 55. Installing the power-supply fan Figure 56. Installing the power-supply fan 84 Removing and installing Field Replaceable Units (FRUs) - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 85
assembly base. 4. Route the antenna cables through the routing guides on the display-assembly base and the power-supply fan. 5. Route the audio-board -supply fan. 6. Route the power-supply fan cable through the routing guide on the display-assembly base. 7. Connect the power-supply fan cable - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 86
Figure 57. Removing the I/O bracket Steps 1. Remove the two screws (M3x5) that secure the power-supply cable connector bracket to the display-assembly base. 2. Lift the power-supply cable connector bracket off the display-assembly base. 3. Remove the two screws (M3x5) that secure the I/O bracket to - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 87
in After working inside your computer. Speakers Removing the speakers CAUTION: The information in this removal section is intended for authorized service technicians only. Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the back cover - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 88
INT SPKR) on the audio board. 2. Remove the speaker cable from its routing guides on the display-assembly base. 3. Lift the speakers and its cable off the The information in this installation section is intended for authorized service technicians only. Prerequisites If you are replacing a component, - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 89
on the display-assembly base. 2. Route the speaker cable through the routing guides on the display-assembly base. 3. Connect the speaker cable to its : The information in this removal section is intended for authorized service technicians only. Prerequisites 1. Follow the procedure in Before working - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 90
off the display-assembly base. Installing the heat sink CAUTION: The information in this installation section is intended for authorized service technicians only. Prerequisites If you are replacing a component, remove the existing component before performing the installation process. About this task - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 91
in After working inside your computer. Processor Removing the processor CAUTION: The information in this removal section is intended for authorized service technicians only. Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the back cover - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 92
from the processor socket (CPU). Installing the processor CAUTION: The information in this installation section is intended for authorized service technicians only. Prerequisites If you are replacing a component, remove the existing component before performing the installation process. 92 Removing - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 93
triangle on the pin-1 corner on the processor socket. When the processor is properly seated, all four corners are aligned at the same height. If one or more corners of the processor is higher than the others, the processor is not seated properly. 2. Align the notches on the processor with the - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 94
inside your computer. System board Removing the system board CAUTION: The information in this removal section is intended for authorized service technicians only. Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the back cover. 4. Remove - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 95
Figure 65. System board callouts 1. Touchscreen cable (TOUCH) 3. Processor socket (CPU) 5. Processor-power cable (ATX CPU) 7. Fan cable (FAN CPU) 9. System-board power cable (ATX SYS) 11. Wireless-card slot (M.2 WLAN) 13. High-speed cable (MB-HS) 15. Solid-state drive slots (M.2 PCIe SSD 1 + M.2 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 96
Figure 66. Removing the system board 96 Removing and installing Field Replaceable Units (FRUs) - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 97
Figure 67. Removing the system board Steps 1. Disconnect the touchscreen cable from its connector (TOUCH) on the system board. 2. Disconnect the display-backlight cable from its connector (LCB BACKLIGHT) on the system board. 3. Using the pull tab, disconnect the camera cable from its connector ( - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 98
Installing the system board CAUTION: The information in this installation section is intended for authorized service technicians only. Prerequisites If you are replacing a component, remove the existing component before performing the installation process. About this task NOTE: Replacing the system - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 99
The following images indicate the location of the system board and provide a visual representation of the installation procedure. Figure 69. Installing the system board Removing and installing Field Replaceable Units (FRUs) 99 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 100
Figure 70. Installing the system board Steps 1. Gently place the system board on the display-assembly base. 2. Align the screw holes on the system board with the screw holes on the display-assembly base. 3. Replace the seven screws (M3x5) that secure the system board to the display-assembly base. 4. - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 101
-button and I/O board Removing the power-button and I/O board CAUTION: The information in this removal section is intended for authorized service technicians only. Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the back cover. 4. Remove - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 102
-assembly base. Installing the power-button and I/O board CAUTION: The information in this installation section is intended for authorized service technicians only. Prerequisites If you are replacing a component, remove the existing component before performing the installation process. 102 Removing - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 103
About this task The following image indicates the location of the power-button and I/O board and provides a visual representation of the installation procedure. Figure 72. Installing the power-button and I/O board Steps 1. Place the power-button and I/O board on the display-assembly base. 2. Align - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 104
inside your computer. Audio board Removing the audio board CAUTION: The information in this removal section is intended for authorized service technicians only. Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the back cover. 4. Remove - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 105
off the display-assembly base. Installing the audio board CAUTION: The information in this installation section is intended for authorized service technicians only. Prerequisites If you are replacing a component, remove the existing component before performing the installation process. Removing and - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 106
About this task The following image indicates the location of the audio board and provides a visual representation of the installation procedure. Figure 74. Installing the audio board Steps 1. Place the audio board on the display-assembly base. 2. Align the screw holes on the audio board with the - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 107
your computer. Display-assembly base Removing the display-assembly base CAUTION: The information in this removal section is intended for authorized service technicians only. Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the stand. 3. Remove the back cover - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 108
display-assembly base. Installing the display-assembly base CAUTION: The information in this installation section is intended for authorized service technicians only. Prerequisites If you are replacing a component, remove the existing component before performing the installation process. About this - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 109
Figure 76. Installing the display-assembly base Steps To install the display-assembly base, perform all the post-requisite procedures. Next steps 1. Install the power-button and I/O board. 2. Install the audio board. 3. Install the system board. NOTE: The system board can be installed with the - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 110
. Operating system Your OptiPlex All-in-One Plus 7420 supports the following operating systems: ● Windows 11 Home, 64-bit ● Windows 11 Pro, 64-bit ● Windows 11 Pro National Education, 64-bit ● Ubuntu Linux 22.04 LTS, 64-bit Drivers and downloads When troubleshooting, downloading, or installing - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 111
view the main screen. Pressing Esc in the main screen displays a message that prompts you to save any unsaved changes and restart the computer. F12 One Time Boot menu To enter the One Time Boot menu, turn on your computer, and then press F12 immediately. BIOS Setup 111 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 112
to shut down the computer, if it is on. The F12 One Time Boot menu displays the devices that you can boot from including the of the computer. Displays the ownership date of the computer. Displays the express service code of the computer. Displays the Ownership Tag of the computer. Displays whether - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 113
Table 25. System setup options-System information menu (continued) Overview DIMM_SLOT 1 Displays the DIMM 1 memory size. DIMM_SLOT 2 Displays the DIMM 2 memory size. Devices Information Panel Type Displays the Panel Type of the computer. Video Controller Displays the video controller type - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 114
Table 27. System setup options-Integrated Devices menu Integrated Devices Date/Time Displays the current date in MM/DD/YYYY format and current time in HH:MM:SS AM/PM format. Camera Enables or disable the camera. By default, the Enable Camera option is selected Audio Enable Audio Enable or - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 115
option is enabled. HTTPs Boot Mode With Auto Mode, the HTTPs Boot extracts Boot URL from the DHCP. With Manual Mode, the HTTPs Boot reads Boot URL from the user-provided data. By default, the Auto Mode option default, the Enable USB PowerShare option is disabled USB Wake Support BIOS Setup 115 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 116
(S3) mode in the operating system. By default, the Block Sleep option is disabled. Deep Sleep Control Enable or disable the Deep Sleep mode support. By default, the Enabled in S4 and S5 option is enabled. Fan Control Override Enable or disable the fan control override feature. By default, the - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 117
Table 32. System setup options-Security menu (continued) Security By default, the Attestation Enable option is enabled. For additional security, Dell Technologies recommends keeping the Attestation Enable option enabled. NOTE: When disabled, this feature may cause compatibility issues or loss of - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 118
, and/or prevents changes to the BIOS configuration settings. When enabled, this option only supports the Authenticated BIOS Manageability Interface (ABI) for managing the BIOS configuration changes. To support this feature, ABI must be enabled and provisioned. When set to Enabled, the Legacy - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 119
Wipe option is disabled. Absolute Enables, disables, or permanently disables the BIOS module interface of the optional Absolute Persistence Module service from Absolute software. By default, the Absolute option is enabled. For additional security, Dell Technologies recommends keeping the Absolute - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 120
Table 33. System setup options-Passwords menu (continued) Passwords The following rules and dependencies apply when the System Password is used ● The computer shuts down when idle for approximately 10 minutes at the system password prompt. ● The computer shuts down after three incorrect attempts - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 121
Table 33. System setup options-Passwords menu (continued) Passwords ● The minimum length of the password is set to 8 characters. ● The password is required to include at least 1 upper case and 1 lower case character. NOTE: These requirements do not affect the hard drive password. By default, the - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 122
. By default, the option is enabled. BIOSConnect Enable or disable cloud Service OS recovery if the main operating system fails to boot with the number the value specified by the Auto OS Recovery Threshold setup option and local Service OS does not boot or is not installed. By default, the option - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 123
Table 35. System setup options-System Management menu (continued) System Management By default, the option is disabled. USB Provision Enable USB Provision Enable or disable the Intel AMT provisioning using the local provisioning file through a USB storage device. By default, the option is - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 124
provided by Intel Trusted Execution Technology. By default, the option is disabled. Table 39. System setup options-Performance menu Performance Multi-Core Support Active Cores Enables to change the number of CPU cores available to the operating system. By default, the All Cores options is - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 125
. 2. Click Product support. In the Search support box, enter the Service Tag of your computer, and then click Search. NOTE: If you do not have the Service Tag, use the SupportAssist feature to automatically identify your computer. You can also use the product ID or manually browse for your computer - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 126
One Time Boot menu, you need the following: ● USB drive formatted to the FAT32 file system (key does not have to be bootable) ● BIOS executable file that you downloaded from the Dell Support 2. Turn on the computer and press F12 to access the One Time Boot Menu, select BIOS Update using the mouse or - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 127
system password: ● A password can have up to 32 characters. ● At least one special character Numbers 0 to 9. ● Upper case letters from A to Z. ● requisites and procedures in Removing the coin-cell battery. 2. Wait for one minute. 3. Follow the procedures and post-requisites in Installing the coin - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 128
NOTE: For information about how to reset Windows or application passwords, see the documentation accompanying Windows or your application. 128 BIOS Setup - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 129
the tests are completed successfully. ● View error messages that inform you of problems encountered during testing. NOTE: Some tests for specific devices require user interaction of a desktop or all-in-one computer, search in the Knowledge Base Resource at www.dell.com/support. Troubleshooting 129 - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 130
lights of your OptiPlex All-in-One Plus 7420. Table 42. System-diagnostic lights Blinking pattern Amber 1 White 1 Problem description TPM to its factory state. You can also download it from the Dell Support website to troubleshoot and fix your computer when it fails to boot into their primary - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 131
It is recommended to create a recovery drive to troubleshoot and fix problems that may occur with Windows. Dell proposes multiple options performed. The following procedure provides the instructions on how to conduct a Wi-Fi power cycle: NOTE: Some Internet Service Providers (ISPs) provide a modem or - Dell OptiPlex All-in-One Plus 7420 | Owners Manual - Page 132
your computer through videos, manuals, and documents. Your Dell computer is uniquely identified by a Service Tag or Express Service Code. To view relevant support resources for your Dell computer, enter the Service Tag or Express Service Code at www.dell.com/support. For more information about
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OptiPlex All-in-One Plus 7420
Owner's Manual
Regulatory Model: W31C
Regulatory Type: W31C002
March 2024
Rev. A01