Lenovo ThinkStation D20 Hardware Maintenance Manual - Page 89
Locating parts on the system board, SAS Serial Attached SCSI LED connector
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Page 89 highlights
Locating parts on the system board 1 Microprocessor 12 V power connector 16 Front panel connector 2 Microprocessor fan connector 17 Cover presence switch connector 3 Microprocessor 18 Thermal sensor connector 4 Memory slots (6) 19 PS/2 connector 5 24-pin system power connector 20 Front audio connector 6 Hard disk drive fan assembly connector 21 Internal speaker connector 7 Diskette drive connector 22 PCI adapter card slot 8 Card reader connector 23 PCI Express x1 adapter card slot 9 Front USB connector 24 PCI Express x16 graphics adapter card slot 10 SATA connectors (5) 25 PCI Express x4 adapter card slot 11 Adapter card fan connector 26 PCI Express x16 graphics adapter card slot 12 SAS (Serial Attached SCSI) LED connector 27 Second COM port connector 13 Battery 28 Rear fan assembly connector 14 Clear CMOS/Recovery jumper 29 Auxiliary 12 V power connector 15 Auxiliary LED connector Chapter 10. Replacing FRUs (Type 4105, 4157, 4217) 81