Lenovo ThinkCentre Edge 91 Hardware Maintenance Manual page 114

Figure 38. System board part locations
1
4-pin power connector
2
Microprocessor
3
Microprocessor fan connector
4
Memory slot 1 (DIMM1)
5
Memory slot 2 (DIMM2)
6
Memory slot 3 (DIMM3)
7
Memory slot 4 (DIMM4)
8
Thermal sensor connector
9
24-pin power connector
10
Battery
11
Clear CMOS (Complementary Metal Oxide
Semiconductor) /Recovery jumper
12
Parallel connector
13
SATA connector 1 (SATA 3.0 connector)
14
SATA connectors 2 and 3 (SATA 2.0 connectors)
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ThinkCentre Hardware Maintenance Manual
15
eSATA connector
16
Power fan connector
17
Front panel connector (for connecting LED indicators and
power switch)
18
Front USB connector 1 (for connecting USB ports 1 and 2
on the front bezel)
19
Front USB connector 2 (for connecting additional USB
devices)
20
Serial (COM2) connector
21
Internal speaker connector
22
Front audio connector
23
PCI card slots (2)
24
PCI Express x1 card slot
25
PCI Express x16 graphics card slot
26
System fan connector
27
Cover presence switch connector (Intrusion switch
connector)
28
PS/2 keyboard and mouse connector