Lenovo H520g Desktop - Manual (Page 72)

Locating parts on the system board
Figure 4 “System board part locations” on page 68 shows the locations of the parts on the system board.
Figure 4. System board part locations
1 4-pin power connector 12 Clear CMOS (Complementary Metal Oxide Semiconductor)
/Recovery jumper
2 Microprocessor 13 Front USB connector 2 (for connecting additional USB
devices)
3 Microprocessor fan connector 14 Front USB connector 3 (for connecting additional USB
devices)
4 Memory slot 1 (DIMM1) 15 Battery
5 Memory slot 2 (DIMM2) 16 Serial (COM2) connector
6 Thermal sensor connector 17 Front audio connector
7 24-pin power connector 18 Internal speaker connector
8 Power fan connector 19 PCI Express x1 card slots (2)
9 SATA connectors (3) 20 PCI Express x16 graphics card slot
10 Front panel connector (for connecting LED
indicators and power switch)
21 System fan connector
11 Front USB connector 1 (for connecting USB
ports 1 and 2 on the front bezel)
68 Lenovo H520gHardware Maintenance Manual