Service Manual
Table Of Contents
- Latitude 3420 Service Manual
- Working inside your computer
- Removing and installing components
- Recommended tools
- Screw List
- Major components of your system
- MicroSD-card
- SIM card tray
- Base cover
- Battery cable
- Battery
- Memory module
- M.2 solid-state drive thermal plate
- M.2 solid-state drive conversion bracket
- M.2 solid-state drive
- Hard-disk drive
- WLAN card
- WWAN card
- I/O cable
- Display assembly
- System fan
- Heatsink assembly
- Power adapter port
- Coin-cell battery
- USB cable
- Ethernet port
- I/O board
- Power-button board
- System board
- Speakers
- Touchpad
- WWAN I/O board
- Palmrest assembly
- Display bezel
- Display panel
- Camera
- Display cable
- Display back-cover
- Drivers and downloads
- System setup
- Troubleshooting
- Built-in self-test (BIST)
- LCD Built-in Self Test (BIST)
- Dell SupportAssist Pre-boot System Performance Check diagnostics
- Diagnostic LED behavior
- Diagnostic error messages
- System error messages
- Recovering the operating system
- Real-Time Clock (RTC Reset)
- Flashing the BIOS
- Backup media and recovery options
- WiFi power cycle
- Flea power release
- Getting help and contacting Dell
● Removable Drive (if available)
● STXXXX Drive
NOTE: XXXX denotes the SATA drive number.
● Optical Drive (if available)
● SATA Hard Drive (if available)
● Diagnostics
NOTE: Choosing Diagnostics, displays the SupportAssist screen.
The boot sequence screen also displays the option to access the System Setup screen.
Navigation keys
NOTE: For most of the System Setup options, changes that you make are recorded but do not take effect until you restart
the system.
Keys Navigation
Up arrow Moves to the previous field.
Down arrow Moves to the next field.
Enter Selects a value in the selected field (if applicable) or follow the link in the field.
Spacebar Expands or collapses a drop-down list, if applicable.
Tab Moves to the next focus area.
Esc Moves to the previous page until you view the main screen. Pressing Esc in the main screen displays a
message that prompts you to save any unsaved changes and restarts the system.
System setup options
NOTE: Depending on your system and its installed devices, the items that are listed in this section may or may not appear.
Table 4. System setup options—System information menu
Overview
Latitude 3420
BIOS Version Displays the BIOS version number.
Service Tag Displays the Service Tag of the system.
Asset Tag Displays the Asset Tag of the system.
Manufacture Date Displays the manufacture date of the system.
Ownership Date Displays the ownership date of the system.
Express Service Code Displays the express service code of the system.
Ownership Tag Displays the Ownership Tag of the system.
Signed Firmware Update Displays whether the Signed Firmware Update is enabled on your system.
Battery Information
Primary Displays that battery is primary.
Battery Level Displays the battery level of the system.
Battery State Displays the battery state of the system.
Health Displays the battery health of the system.
AC Adapter Displays whether the AC adapter is connected or not.
System setup 97