Lenovo ThinkServer RD220 Hardware Maintenance Manual page 139

Table 5. Callout descriptions
Jumper name
1
UEFI boot recovery jumper (J29)
2
IMM recovery jumper (J147)
3
SW4 switch block (reserved)
4
SW3 switch block
Notes:
1. If no jumper is present, the server responds as if the pins are set to 1 and 2.
2. Changing the position of the UEFI boot recovery jumper 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.
Switch block 3, switches 1 - 8 describes the function of each switch on the switch block.
Table 6. Switch block 3, switches 1 - 8
Switch
number Default value
8
Off
7 Off
6
Off
5 Off
4 Off
3 Off
2 Off
1 Off
Clear CMOS. When this switch is toggled to On, it clears the CMOS data, which clears the power-on
password.
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 Chapter 2 "Safety information" on page 3,
"Installing optional devices and replacing FRUs" on page 136, and "Turning off the server" on page 47.)
2. Any system-board switch or jumper blocks that are not shown in the illustrations in this document
are reserved.
Jumper setting
• Pins 1 and 2: Normal (default) Loads the primary server
firmware (formerly called BIOS) ROM page.
• Pins 2 and 3: Loads the secondary (backup) server firmware
ROM page.
• 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.
Switch
description
Reserved.
Reserved.
Reserved.
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 password is overridden.
Changing the position of this switch does not affect the administrator password
check if an administrator password is set.
Reserved.
Reserved.
Reserved.
Reserved.Clear
.
Chapter 6 Removing and installing FRUs
133