Lenovo ThinkCentre M91 Hardware Maintenance Manual - Page 78
Opening the computer cover, This provides instructions on how to open the computer cover.
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Figure 4. System board part locations 1 Thermal sensor connector 2 Memory slots (2) 3 Battery 4 Microprocessor fan connector 5 Clear CMOS (Complementary Metal Oxide Semiconductor) /Recovery jumper 6 Internal speaker connector 7 Serial (COM2) connector 8 eSATA connector 9 SATA connector 2 (SATA 2.0 connector) 10 PS/2 keyboard and mouse connector 11 Front USB connector 2 (for connecting additional USB devices) 12 Cover presence switch connector (Intrusion switch connector) 13 PCI card slot 14 Front USB, front panel, and front audio connector (for connecting USB ports 1 and 2 on the front bezel, LED indicators and power switch, and microphone and headphone connectors on the front bezel) 15 SATA connector 1 (SATA 3.0 connector) 16 System fan connector 17 4-pin power connector 18 Microprocessor Opening the computer cover Attention: Do not open your computer or attempt any repair before reading and understanding the "Important safety information" in the ThinkCentre User Guide. To obtain a copy of the ThinkCentre User Guide, go to: http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on how to open the computer cover. 72 ThinkCentre Hardware Maintenance Manual