Lenovo x3550 M5 - Page 42

CMOS clear jumper (J11)
1
2
On
4
7
2
6
1
5
3
2
1
1
2
3
On
UEFI boot backup
jumper (J13)
NMI button
SW3 switch
block
System TPM physical
presence switch (SW11)
Off
Off
38
Figure24.System-boardswitches,jumpers,andbuttons
Thefollowingtabledescribesthejumpersonthesystemboard.
Table1.Systemboardjumpers
JumpernumberJumpernameJumpersetting
JP11
CMOSclearjumper•Pins1and2:Normal(default).
•Pins2and3:Clearsthereal-timeclock(RTC)
registry.
JP13UEFIbootbackupjumper
•Pins1and2:Normal(default).Loadsthe
primaryserverfirmwareROMpage.
•Pins2and3:Loadsthesecondary(backup)
serverfirmwareROMpage.
Notes:
1.Ifnojumperispresent,theserverrespondsasifthepinsaresettothedefault.
2.ChangingthepositionoftheUEFIbootbackupjumper(JP13)frompins1and2topins2and3beforetheserver
isturnedonalterswhichflashROMpageisloaded.Donotchangethejumperpinpositionaftertheserveris
turnedon.Thiscancauseanunpredictableproblem.
ThefollowingtabledescribesthefunctionsoftheSW3switchblockonthesystemboard.
28LenovoSystemx3550M5InstallationandServiceGuide