Lenovo ThinkSystem SR950 V3 - Lower Processor Board (MB) Connectors

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”, “Handling static sensitive devices”, and “Power off the server” in User Guide
or Hardware Maintenance Guide.
2. Any system I/O board and interposer assembly 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 12. System I/O board and interposer assembly switches
1 SW1
SW1 switch block
The following table describes the functions of the SW1 switch block on the system I/O board and interposer
assembly.
Table 9. System I/O board and interposer assembly SW1 switch block description
Switch number
Jumper Name Default position
Function
SW-1
Low security
Off Keeping this switch in the On position
allows transitioning between signed
official IMM builds and IMM test signed
builds, and bypasses CRTM boot check
of iMM firmware.
SW-2
Reserved
Off
Reserved
SW-3
Reserved
Off
Reserved
SW-4
Reserved
Off
Reserved
Lower processor board (MB) connectors
The following illustrations show the internal connectors on the lower processor board (MB).
Chapter 2. Server components 23