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”, “Handling static sensitive devices”, and “Power off the server” in User Guide
or Hardware Maintenance Guide.
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 21. System-board switch
1 SW1 switch block
SW1 switch block
The following table describes the functions of the SW1 switch block on the system board.
Switch
number
Default
position Description
Definition
1
Off Clear CMOS jumper
• Off: Normal (default).
• On: Clear the real-time clock (RTC)
registry.
2
Off Reserved Reserved
3
Off Force XCC update jumper
• Off: Normal (default).
• On: Force the Lenovo XClarity
Controller to update to the latest
version.
4
Off
Reserved Reserved
Chapter 2. Server components 31
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