Lenovo ThinkCentre M57 Hardware Maintenance Manual - Page 123
illustration - motherboard
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System board connectors The system board (sometimes called the planar or motherboard) is the main circuit board in your computer. It provides basic computer functions and supports a variety of devices. The following illustration shows the locations of parts on the system board. 1 Battery 2 SATA connector 3 Optical drive connector 4 PCI riser connector 5 Front panel connector 6 12v power connector 7 Power connector 8 System fan connector 9 Microprocessor 10 Internal speaker connector 11 Memory connector 1 12 Memory connector 2 13 Microprocessor fan connector 14 Clear CMOS/Recovery jumper 15 Temperature sensor connector 16 Rear fan connector 17 KB and MS connector 18 Cover presence switch connector 19 USB connector Chapter 9. Replacing FRUs - Ultra SFF Desktop computers 117