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1
UEFI boot backup
2
jumper (JP7)
3
CMOS clear
jumper (JP1)
3
2
1
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
JP1
JP7
JP20
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
Switch block 3 (SW3)
NMI button
Jumper name
CMOS clear jumper
UEFI boot backup jumper
System TPM physical presence
jumper
off
on
1
2
3
4
System TPM physical
presence jumper (JP20)
Jumper setting
• Pins 1 and 2: Normal (default).
• Pins 2 and 3: Clears the real-time clock (RTC)
registry.
• 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.
• Pins 1 and 2: Normal (default).
• Pins 2 and 3: Indicates a physical presence to
the system TPM.
1
2
3
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Table of Contents
Troubleshooting
