System-board switches and jumpers

The following illustration shows the location and description of the switches and jumpers.

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 switches and jumpers

Table 1. System board jumpers.
Jumper number	Jumper name	Jumper setting
J29	UEFI boot recovery jumper	Pins 1 and 2: Normal (default) Loads the primary server firmware ROM page. Pins 2 and 3: Loads the secondary (backup) server firmware ROM page.
J147	IMM recovery jumper	Pins 1 and 2: Normal (default) Loads the primary IMM firmware ROM page. Pins 2 and 3: Loads the secondary (backup) IMM firmware ROM page.
Table notes If no jumper is present, the server responds as if the pins are set to 1 and 2. Changing the position of the UEFI boot recovery jumper (J29) from pins 1 and 2 to pins 2 and 3 before the server is turned on alters which flash ROM page is loaded. Do not change the jumper pin position after the server is turned on. This can cause an unpredictable problem.

The following table describes the functions of the SW3 switch block on the system board.

Table 2. System board SW3 switch block definition
Switch number	Default position	Description
1	Off	Clear CMOS memory. When this switch is toggled to On, it clears the data in CMOS memory.
2	Off	Trust Platform Module (TPM) physical presence. Turning this switch to the on position indicates a physical presence to the TPM.
3	Off	Reserved.
4	Off	Reserved.

The following table describes the functions of the SW4 switch block on the system board.

Table 3. System board SW4 switch block definition
Switch number	Default position	Description
1	Off	Power-on password override. Changing the position of this switch bypasses the power-on password check the next time the server is turned on and starts the Setup utility so that you can change or delete the power-on password. You do not have to move the switch back to the default position after the power-on password in overridden. Changing the position of this switch does not affect the administrator password check if an administrator password is set. See Passwords for additional information about passwords.
2	Off	When you toggle this switch On and then Off, you force a power-on, which overrides the power-on and power-off button on the server and they become nonfunctional.
3	Off	(Trained service technician only) Forced power permission. Changing the position of this switch overrides the IMM power-on checking process.
4	Off	Reserved.

Important

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, Installation guidelines, Handling static-sensitive devices, and Turning off the server.
Any system-board switch or jumper blocks that are not shown in the illustrations in this document are reserved.

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