Switch block 6 (SW6)
CMOS clear jumper
System TPM physical
presence jumper
UEFI boot backup jumper
Figure 36. System-board switches, jumpers, and buttons: for machine type 8871–AC3
The following table describes the jumpers on the system board.
Table 2. System board jumpers
Jumper number
Jumper name
Jumper setting
J7
System TPM physical presence
jumper
• Pins 1 and 2: Normal (default).
• Pins 2 and 3: Indicates a physical presence to
the system TPM.
J11
CMOS clear jumper
• Pins 1 and 2: Normal (default).
• Pins 2 and 3: Clears the real-time clock (RTC)
registry.
J15
UEFI boot backup 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.
Notes:
1. If no jumper is present, the server responds as if the pins are set to the default.
2. Changing the position of the UEFI boot backup jumper (J15) 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.
36
Lenovo System x3650 M5 Installation and Service Guide
Summary of Contents for x3650 M5
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