102 Installing System Components6 Close the system. See "Closing the System" on page 47.7 Reconnect the system to the electrical outlet, and turn on the system.System BoardCAUTION: Many repairs may only be done by a certified service technician. Youshould only perform troubleshooting and simple repairs as authorized in yourproduct documentation, or as directed by the online or telephone service andsupport team. Damage due to servicing that is not authorized by Dell is not coveredby your warranty. Read and follow the safety instructions that came with theproduct.CAUTION: The heat sink can get hot during operation. To avoid burns, ensure thatthe system has sufficient time to cool before removing the system board.Removing the System Board1 Turn off the system and attached peripherals, and disconnect the systemfrom the electrical outlet.2 Open the system. See "Opening the System" on page 47.3 Depending on your configuration, disconnect the following cables fromthe system board. See Figure 6-2 for connector locations.• Two power-supply cables from the PWR_CONN and 12V connectors• Diskette data cable from the FLOPPY connector• I/O panel cable from the CONTROL_PANEL connector• Processor cooling fan cable from the CPU_FAN connector• Drive cage cooling fan cable from the HDD_FAN connector• SATA hard-drive data cable(s) from the SATA connector(s)• Intrusion switch cable from the INTRUSION SWITCH connector4 Remove all expansion cards and any attached cables. See "Removing anExpansion Card" on page 70.5 Remove all memory modules. See "Memory" on page 76.NOTE: Record the memory-module socket locations to ensure properreinstallation of the memory modules.CAUTION: The processor and heat sink can become extremely hot. Allowsufficient time for the processor and heat sink to cool before handling.
