IBM System x3650 M3 4255 Service Manual page 36

The following illustration shows the jumper settings for switch blocks SW3 and SW4
on the system board.
Table 3 on page 19 and Table 4 on page 19 describe the function of each switch on
SW3 and SW4 switch blocks on the system board.
18
IBM System x3650 M3 Types 4255, 7945, and 7949: Problem Determination and Service Guide
Table 2. System board jumpers (continued)
Jumper Jumper
number name
J147 IMM
recovery
jumper
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.
1 2 3 4 1 2 3 4
SW4 switch block
Off
Jumper setting
v Pins 1 and 2: Normal (default) Loads the primary IMM
firmware ROM page.
v Pins 2 and 3: Loads the secondary (backup) IMM firmware
ROM page.
SW3 switch block
Off