Lenovo THINKCENTRE 6396 - Manual (Page 89)

System board locations
1 Microprocessor and heat sink 9 Modem daughter card (MDC)
connector
2 Memory connectors (2) 10 Express card USB connector
3 Thermal sense cable connector 11 Express card PCIe connector
4 Front USB connector 12 Media card reader connector
5 Power switch/LED connector 13 Internal speaker connector
6 Battery 14 Front audio connector
7 SATA IDE connectors (2) 15 Internal power distribution connector
8 Clear CMOS/Recovery jumper 16 System fan connector
Chapter 8. Replacing FRUs 83