System board jumpers

The following illustration shows the location of the jumpers on the system board of your server.

Figure 1. System board jumpers

Table 1. Jumper description

Jumper / Switch name	Jumper / Switch number	Jumper / Switch setting
1 Clear CMOS jumper	J95	Pins 1 and 2: The jumper is in default setting. Pins 2 and 3: Clear the real-time clock (RTC) registry.
2 Override power-on password jumper	J50	Pins 1 and 2: The jumper is in default setting. Pins 2 and 3: Override the power-on password.
3 Boot backup XClarity Controller	J47	Pins 1 and 2: The jumper is in default setting. Pins 2 and 3: The tower server will boot by using a backup of the XClarity Controller firmware.
4 TPM/TCM physical presence jumper	J46	Pins 1 and 2: The jumper is in default setting. Pins 2 and 3: TPM/TCM physical presence is asserted.
5 ME firmware security override	J30	Pins 1 and 2: The jumper is in default setting. Pins 2 and 3: Enable Flash security override. Note For debug only.
6 Force XCC update jumper	J45	Pins 1 and 2: The jumper is in default setting. Pins 2 and 3: Force the Lenovo XClarity Controller to update to the latest version.
7 Force XCC reset jumper	J181	Pins 1 and 2: The jumper is in default setting. Pins 2 and 3: Reset the Lenovo XClarity Controller.
8 Power permission	J49	Pins 1 and 2: The jumper is in default setting. Pins 2 and 3: Enable Power On.

Important

• Before you move any jumpers, turn off the server; then, disconnect all power cords and external cables. Do not open your server or attempt any repair before reading and understanding the following information:

  • Safety Information page

  • Handling static-sensitive devices

• Any system-board switch or jumper block that is not shown in the illustrations in this document are reserved.