Jumpers, switches, and buttons on standard I/O book board

This topic provides the location and information about the jumpers, switches, and buttons on the standard I/O book board.

The following illustration shows the location of the switches, jumper, and button on the server.

Note

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

The following table describes the jumper on the standard I/O book board.

Table 1. standard I/O book jumper.

Three-column table that shows the jumper information and a note at the bottom that spans all columns

Jumper number	Jumper name	Jumper setting
J35	IMM security jumper	Pins 1 and 2: Removes the security check, allowing unsigned IMM firmware. Pins 2 and 3: (default) Allows only signed IMM firmware to be flashed.
Note If no jumper is present, the server responds as if the pins are set to the default.

The following table describes the functions of the SW1 switch block on the standard I/O book board.

Table 2. standard I/O book board SW1 switch block descriptions

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	Reserved
3	Off	Reserved
4	Off	Reserved
5	Off	Reserved
6	Off	Reserved
7	Off	Force UEFI backup bank. Changing the position of the switch to ON will force the system to boot from the backup UEFI bank.

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

The following table describes the functions of the button on the standard I/O book board:

Table 3. Button on the standard I/O bookserver

Button name	Function
NMI button	This button is on the rear of the standard I/O book. Press this button to force a nonmaskable interrupt to the microprocessor. 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).