System-board switches
The following illustrations show the location of the switches, jumpers, and buttons on the server.
Important:
1.  Before you change any switch settings or move any jumpers, turn off the server; then, disconnect all 
power cords and external cables. Review the following information:
•  https://pubs.lenovo.com/safety_documentation/
•  “Installation Guidelines” on page 41
•  “Handling static-sensitive devices” on page 43
•  “Power off the node” on page 51
2.  Any system-board switch or jumper block that is not shown in the illustrations in this document are 
reserved.
Note: If there is a clear protective sticker on the top of the switch blocks, you must remove and discard it to 
access the switches.
Figure 9. System-board switches
1  SW5 2  SW13
SW5 switch block
Table 15.  SW5 switch block definition
Switch 
number
Switch name
Usage description
On Off
1 Force BMC reset
Forces hot reset BMC chip Normal (default)
2 Force BMC CPU reset Forces warm XCC and CPU rest
Normal (default)
3
ME security override Enables ME low security mode Normal (default)
4 Password clear
Forces reset uEFI password Normal (default)
5
Low security Enables XCC low security mode Normal (default)
6
ME recovery Forces ME into recovery mode Normal (default)
Chapter 2. Hardware components 29