Lenovo ThinkStation C20 Hardware Maintenance Manual - ThinkStation C20/C20x - Page 78
Clear CMOS Complementary Metal Oxide, Front USB connector
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35 34 33 32 31 Figure 4. System board part and connector locations 1 CPU 1 memory slots (6) 2 CPU 1 memory fan connector 3 CPU 2 12 V power connector 4 Microprocessor 2 5 24-pin power connector 6 CPU 2 fan connector 7 CPU 2 memory fan connector 8 CPU 2 memory slots (6) 9 Power switch and LEDs connector 10 Auxiliary LED connector 11 Right rear fan connector 12 Front fan connector 13 Card reader connector 14 Front USB connector 15 Front IEEE 1394 connector 16 Hard disk drive connectors (5) 17 Optical drive connectors (3) 18 Battery 19 Clear CMOS (Complementary Metal Oxide Semiconductor) /Recovery jumper 20 Thermal sensor connector 21 Cover presence switch connector 22 Personal System/2® (PS/2®) keyboard and mouse connector 23 Internal speaker connector 24 Front audio connector 25 PCI card slot 26 PCI Express x4 card slot (x16 mechanical) 27 PCI Express x16 card slot 28 PCI card slot 29 PCI Express x16 card slot 30 PCI Express x1 card slot 31 Auxiliary 12 V power connector 32 Left rear fan connector 33 CPU 1 12 V power connector 34 CPU 1 fan connector 35 Microprocessor 1 72 ThinkStation Hardware Maintenance Manual