Dell OptiPlex SX280 - Manual (Page 84)

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System Board Components
Dell™ OptiPlex™ SX280 User's Guide
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1 fan shroud power connector (FAN1) 8 password jumper (PSWD)
2 optional speaker connector (SPEAKER) 9 Clear CMOS jumper (CLR_CMOS)
3 system board speaker 10 standby power indicator (AUX_LED)
4 channel B memory connector (CHB_DIMM) 11 fan shroud power connector (FAN2)
5 channel A memory connector (CHA_DIMM) 12 hard drive power cable connector (ATA_PWR)
6 SATA hard drive data cable connector 13 chassis intrusion switch power connector (INTRUDER)
7 battery 14 microprocessor heat sink