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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
SW1 switch block
1
SW1 switch block
The following table describes the functions of the SW1 switch block on the system board.
Default
Switch
position
number
1
Off
2
Off
3
Off
4
Off
Description
Clear CMOS jumper
Reserved
Force XCC update jumper
Reserved
Definition
• Off: Normal (default).
• On: Clear the real-time clock (RTC)
registry.
Reserved
• Off: Normal (default).
• On: Force the Lenovo XClarity
Controller to update to the latest
version.
Reserved
.
Chapter 2
Server components
31
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