Table 4. 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.
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
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.
20
System x3550 M3Problem Determination and Service Guide
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