Lenovo System x3550 M3 Problem Determination And Service Manual page 32

Table 4. System board jumpers
Jumper number
J29
J147
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 (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 5. System board SW3 switch block definition
Default position
Switch number
1 Off
2 Off
3
Off
4
Off
The following table describes the functions of the SW4 switch block on the system board.
System x3550 M3Problem Determination and Service Guide
20
Jumper name
UEFI boot recovery jumper
IMM recovery jumper
Jumper setting
• 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.
• 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.
Description
Clear CMOS memory. When this switch is
toggled to On, it clears the data in CMOS
memory.
Trust Platform Module (TPM) physical
presence. Turning this switch to the on position
indicates a physical presence to the TPM.
Reserved.
Reserved.