Figure 4. System board part locations

1Microprocessor

2Microprocessor fan connector

3Memory slots (2)

4Thermal sensor connector

524-pin power connector

6Parallel connector

7Battery

8Cover presence switch connector (Intrusion switch connector) (available in some models)

9SATA connectors (3)

10Clear CMOS (Complementary Metal Oxide Semiconductor) /Recovery jumper

11Power fan connector

12

13

14

15

16

17

18

19

20

21

22

Front panel connector

USB connectors (2)

Serial (COM 2) connector

Front audio connector

Internal speaker connector

PCI card slots (2)

PCI Express x1 card slot

PCI Express x16 graphics card slot

System fan connector 4-pin power connector

PS/2 keyboard and mouse connector

Locating internal drives

Internal drives are devices that your computer uses to read and store data. You can add drives to your computer to increase storage capacity and enable your computer to read other types of media. Internal drives are installed in bays. In this manual, the bays are referred to as bay 1, bay 2, and so on.

When installing or replacing an internal drive, it is important to note the type and size of the drive that you can install or replace in each bay and correctly connect the cables to the drive installed. Refer to the appropriate section in Chapter 2 “Installing or replacing hardware” on page 11 for instructions on how to install or replace internal drives for your computer.

Chapter 1. Product overview 9

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Lenovo 804 manual Locating internal drives, System board part locations