Lenovo System x3550 M5 - Page 42

UEFI boot backup
jumper (J13)
System TPM physical
presence switch (SW11)
Clear CMOS jumper (J11)
NMI button
1
2
SW3 switch
block
On
Off
48 3
7
26 1
5
3
2
1
1
2
3
On
Off
Figure27.System-boardswitches,jumpers,andbuttons
Thefollowingtabledescribesthejumpersonthesystemboard.
Table1.Systemboardjumpers
JumpernumberJumpernameJumpersetting
J11
ClearCMOSjumper•Pins1and2:Normal(default).
•Pins2and3:Clearsthereal-timeclock(RTC)
registry.
J13UEFIbootbackupjumper
•Pins1and2:Normal(default).Loadsthe
primaryserverfirmwareROMpage.
•Pins2and3:Loadsthesecondary(backup)
serverfirmwareROMpage.
Notes:
•Ifnojumperispresent,theserverrespondsasifthepinsaresettothedefault.
•ChangingthepositionoftheUEFIbootbackupjumper(J13)frompins1and2topins2and3beforetheserveris
turnedonalterswhichflashROMpageisloaded.Donotchangethejumperpinpositionaftertheserveris
turnedon.Thiscancauseanunpredictableproblem.
28LenovoSystemx3550M5InstallationandServiceGuide