Figure 10. System-board jumpers and buttons
The following table describes the jumpers and buttons on the system board.
Table 10. System-board jumpers and buttons
Jumper and button name Jumper setting / Button function
1 Power permission override jumper
• Pins 1 and 2: Normal (default).
• Pins 2 and 3: Override the power-on permission.
2 Force Lenovo XClarity Controller update
jumper
• Pins 1 and 2: Normal (default).
• Pins 2 and 3: Force the Lenovo XClarity Controller to update to
the latest version.
3 Clear CMOS jumper
• Pins 1 and 2: Normal (default).
• Pins 2 and 3: Clear the real-time clock (RTC) registry.
4 Force NMI button This button is on the rear of the server. Press this button to force a
nonmaskable interrupt to the processor. You might have to use a
pen or the end of a straightened paper clip to press the button.
You can also use it to force a blue-screen memory dump (use this
button only when you are directed to do so by Lenovo Support).
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 information in
http://thinksystem.lenovofiles.com/help/topic/
safety_documentation/pdf_files.html
, “Installation guidelines” on page 61, “Handling static-sensitive
devices” on page 64, and “Power off the server” on page 106.
Chapter 2. Server components 27
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