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4-80 Sun Fire V20z and Sun Fire V40z Servers—User Guide • March 2005
4.6.2 Clear-CMOS Jumper
The location of the Clear-CMOS jumper (J125) on the Sun Fire V40z motherboard is
shown below. This jumper can be used to clear the CMOS if the server hangs during
certain conditions.
■ The default position for the jumper is pins 1+2, which is the setting for “Clear-
CMOS-Removed.” This setting retains CMOS settings on each reboot of the
server.
■ If you move the jumper to pins 2+3, this is the “Clear-CMOS-Installed” setting.
This setting will clear the CMOS settings with each reboot of the server.
FIGURE 4-42 Sun Fire V40z Motherboard, Showing Clear-CMOS Jumper J125
Clear-CMOS
Jumper J125
123
CLR
DFLT
CPU0
CPU1
J125