Replacing the system boardNOTE: Before working inside your Embedded Box PC, read the safety information that shipped with your Embedded BoxPC and follow the steps in Before working inside your Embedded Box PC. After working inside your Embedded Box PC,follow the steps in After working inside your Embedded Box PC. For more safety best practices, see the RegulatoryCompliance home page at www.dell.com/regulatory_compliance.NOTE: Your Embedded Box PC’s Service Tag is stored in the system board. You must enter the Service Tag in the BIOSsetup program after you replace the system board.NOTE: Replacing the system board removes any changes you have made to the BIOS using the BIOS setup program. Youmust make the appropriate changes again after you replace the system board.Topics:• Procedure• Post-requisites• Entering the Service Tag in the BIOS setup programProcedure1. Place the system board on the chassis.2. Align the screw holes on the system board with the screw holes in the chassis.3. Replace the screws that secure the system board to the chassis.4. Connect the serial-port cable, SATA data-cable, and SATA power-cable to the connectors on the system board.Post-requisites1. Replace the CPU board.2. Follow step 2 to step 6 in Replacing the top cover.3. Replace the power connectors.4. Replace the riser card.5. Replace the heat sink.6. Replace the memory module.7. Replace the intrusion switch.8. Replace the SIM card.9. Replace the CANbus card or WWAN card.10. Replace the WWAN-antenna connectors.11. Replace the WLAN card.12. Replace the WLAN-antenna connectors.13. Replace the PCI/PCIe card (if necessary).14. Follow step 2 to step 8 in “Replacing the back cover”.Entering the Service Tag in the BIOS setupprogram1. Turn on or restart the Embedded Box PC.2. Press F2 when the Dell logo is displayed to enter the BIOS setup program.5490 Replacing the system board