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System board jumpers

The following illustration shows the jumpers on the system board of your 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
System board jumpers

Table 1. Jumper description
Jumper/Swtich nameJumper/Swtich numberJumper/Swtich 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 TCM/TPM physical presence jumper

J46

  • Pins 1 and 2: The jumper is in default setting.
  • Pins 2 and 3: TCM/TPM 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, power 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:
  • Any system-board switch or jumper block that is not shown in the illustrations in this document are reserved.