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Switches, jumpers, and buttons

The following illustrations show the location of the switches, jumpers, and buttons on the server.

If there is a clear protective sticker on the top of the switch block, you must remove and discard it to access the switch.
Figure 1. Switches, jumpers and buttons

Table 1. System-board switches, jumpers, and buttons
1 J203 Switch block (SW13)

See System-board SW13 switch block descriptions for more details.

2 Light path button

Press this button to light the LEDs on the system board when the power source has been removed from the server.


The following table describes the functions of the SW13 switch block on the system board.

The following table describes the functions of the SW613 switch block on the system board.

Table 2. System-board SW13 switch block descriptions.
Switch numberDefault positionOffOn
1OffHost TPM Physical Presence disableHost TPM Physical Presence enable
2OffDisable PASSWORD_OVERRIDE functionEnable PASSWORD_OVERRIDE function
3OffSerial port message from Lenovo XClarity ControllerSerial port message from uEFI
4OffReserved for trained service technician
5OffReserved for trained service technician
6OffReserved for trained service technician
7OffReserved for trained service technician
8OffNormalForce RTC reset
  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.

The following table describes the functions of the button on the system board.

Table 3. Button on the server.

Two column table for documenting the button name and corresponding function.

Button nameFunction
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).