System-Board Switches And Jumpers - IBM System x3650 M3 4255 Service Manual

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.
The default positions for the UEFI and the IMM recovery jumpers are pins 1 and 2.
The following table describes the jumper settings for J29 and J147 on the system
board.
UEFI boot recovery
jumper (J29)
SW4 switch block
Table 2. System board jumpers
Jumper Jumper
number name
J29 UEFI boot
recovery
jumper
IMM recovery jumper
(J147)
1
2
3
3
2
1
SW3 switch block
Jumper setting
v Pins 1 and 2: Normal (default) Loads the primary server
firmware ROM page.
v Pins 2 and 3: Loads the secondary (backup) server firmware
ROM page.
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Chapter 2. Introduction