Lenovo ThinkCentre M91p Hardware Maintenance Manual - Page 127
System board parts locations on shows the locations of the parts on the system board.
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Locating parts on the system board Figure 52 "System board parts locations" on page 119 shows the locations of the parts on the system board. Figure 52. System board parts locations 1 4-pin power connector 15 eSATA connector 2 Microprocessor 16 Power fan connector 3 Microprocessor fan connector 17 Front panel connector (for connecting power switch and LED indicators) 4 Memory slot 1 (DIMM1) 18 Front USB connector 1 (for connecting USB port 1and 2 on the front bezel) 5 Memory slot 2 (DIMM2) 19 Front USB connector 2 (for connecting additional USB devices) 6 Memory slot 3 (DIMM3) 20 Serial (COM2) connector 7 Memory slot 4 (DIMM4) 21 Internal speaker connector 8 Thermal sensor connector 22 Front audio connector 9 24-pin power connector 23 PCI card slots (2) 10 Battery 24 PCI Express x1 card slot 11 Clear CMOS (Complementary Metal Oxide Semiconductor) /Recovery jumper 25 PCI Express x16 graphics card slot 12 Parallel connector 26 System fan connector 13 SATA connectors 1 and 2 (SATA 3.0 connectors) 27 Cover presence switch connector (Intrusion switch connector) 14 SATA connector 3 (SATA 2.0 connector) 28 PS/2 keyboard and mouse connector Chapter 9. Replacing FRUs (Machine Types: 4466, 4471, 4474, 4477, 4480, 4485, 4496, 4498, 4503, 4512, 4514, 4518, 4554, 7005, 7023, 7033, 7035, 7072, 7079, and 7177.) 119