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CMOS clear
jumper (JP1)
UEFI boot backup
jumper (JP7)
System TPM physical
presence jumper (JP20)
Switch block 3 (SW3)
NMI button
1
2
3
4
off
on
1
2
3
1
2
3
1
2
3
Figure 16. System-board switches, jumpers, and buttons
The following table describes the jumpers on the system board.
Table 3. System board jumpers
Jumper number
Jumper name
Jumper setting
JP1
CMOS clear jumper
• Pins 1 and 2: Normal (default).
• Pins 2 and 3: Clears the real-time clock (RTC)
registry.
JP7
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.
JP20
System TPM physical presence
jumper
• Pins 1 and 2: Normal (default).
• Pins 2 and 3: Indicates a physical presence to
the system TPM.
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 (JP7) 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.
30
Lenovo System x3650 M4 HD Installation and Service Guide
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