Locating parts on the system board
Figure 42 shows the location of parts on the system board.
1 PCI adapter card slot 11 Memory slots (4)
2 PCI Express x16 adapter card slot 12 24-pin power connector
3 Battery 13 Serial (COM 2) connector
4 Internal speaker connector 14 Front audio connector
5 Cover presence (Intrusion) switch
connector
15 SATA connectors (2)
6 Microprocessor fan connector 16 System fan connector
7 Thermal sensor connector 17 Front USB connector 1
8 Microprocessor 18 Front USB connector 2
9 4-pin power connector 19 Clear CMOS/Recovery jumper
10 Front panel connector 20 Power fan connector
Replacing the battery
Attention
Do not open your computer or attempt any repair before reading and understanding the
“Important safety information” in the ThinkCentre Safety and Warranty Guide that came with
your computer. To obtain a copy of the ThinkCentre Safety and Warranty Guide, go to:
http://www.lenovo.com/support
This section provides instructions on how to replace the battery.
Your computer has a special type of memory that maintains the date, time, and
settings for built-in features, such as parallel-port assignments (configuration). A
battery keeps this information active when you turn off the computer.
Figure 42. System board parts locations
Chapter 9. Replacing FRUs - Desktop computers 131
