Mini PCI-E slot

 

Power connector

eSATA connector

 

Power fan header

 

SSD power connector (Optional)

 

LPC debug connector

 

SATA connectors (4)

 

Serial (COM2) connector

 

Front panel connector

 

SPI debug connector

Mode switch connector

 

Front USB connector (2)

ROM socket

 

Clear CMOS jumper

Front USB header

 

PCI express X 1 adapter slots (3)

Front audio connector

 

PCI express X 16 adapter slot

System fan header

 

 

4.2 Replacing hardware

Attention: Do not remove the computer cover or attempt any repair before reading the “Important safety information” in the Safety and Warranty Guide that was included with your computer or in the Hardware Maintenance Manual (HMM) for the computer. To obtain copies of the Safety and Warranty Guide or HMM, go to the Support Web site at http://consumersupport.lenovo.com.

4.2.1 General information

Pre-disassembly instructions

Before proceeding with the disassembly procedure, make sure that you do the following:

1.Turn off the power to the system and all peripherals.

2.Unplug all power and signal cables from the computer.

3.Place the system on a flat, stable surface.

User Guide 37

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Lenovo 3109, 4743 K430, 10086 manual Replacing hardware, General information, Pre-disassembly instructions