Lenovo H520s Hardware Maintenance Manual page 31

Identifying parts on the motherboard
The motherboard (sometimes called the planar or system board) is the main circuit board in your computer.
It provides basic computing functions and supports a variety of devices that are factory-installed or that
you can install later. The following illustration shows the location of connectors and components on the
front of the motherboard.
1. 12V power connector
2. Microprocessor and heat sink
3. Microprocessor fan header
4. Memory slots (2)
5. Thermal sensor header
6. Power connector
7. Battery
8. SATA connectors (3)
9. eSATA connector
10. Power fan header
11. Front panel connector
12. Clear CMOS jumper
13. Front USB connectors (2)
14. Mini PCI-E slot
15. Mode switch connector
16. Serial (COM2) connector
17. PCI express X 1 adapter slots (3)
18. Front audio connector
19. PCI express X 16 adapter slot
20. System fan header
.
Chapter 7 Locating connectors, controls and components
25