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System-board jumpers and buttons

The following illustration indicates the location of the jumpers and buttons on the server.

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 1. System-board jumpers and buttons
System-board jumpers and buttons

The following table describes the jumpers and buttons on the system board.

Table 1. System-board jumpers and buttons
Jumper and button nameJumper setting / Button function
1 Force NMI buttonThis 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).
2 Power permission override jumper
  • Pins 1 and 2: Normal (default).
  • Pins 2 and 3: Override the power-on permission.
3 Force XCC update jumper
  • Pins 1 and 2: Normal (default).
  • Pins 2 and 3: Force the Lenovo XClarity Controller to update to the latest version.
4 Clear CMOS jumper
  • Pins 1 and 2: Normal (default).
  • Pins 2 and 3: Clear the real-time clock (RTC) registry.
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 Safety Information page, Installation Guidelines, Handling static-sensitive devices, and Power off the server.
  2. Any system-board switch or jumper block that is not shown in the illustrations in this document are reserved.