Chapter 2 Powering On and Configuring BIOS Settings 2-59
2.6 Using the Clear CMOS Jumper
TP51/TP52 or J9
The names and locations of this jumper differ between the Sun Fire X4100/X4200 and
the X4100 M2/X4200 M2 servers:
■ In Sun Fire X4100/X4200 servers this is jumper TP51/TP52. See FIGURE 2-8 for the
location.
■ In Sun Fire X4100 M2/X4200 M2 servers this is jumper J9. See FIGURE 2-9 for the
location.
You can use this jumper to clear the server’s CMOS settings in the case of a system
freeze. For example, if the server freezes because of incorrect settings and will not
boot, use this jumper to invalidate the settings and reboot with defaults.
1. Shut down the server to standby power mode by using a nonconducting pointer
or stylus to press and release the recessed Power button on the front panel.
See Section 2.2, “Powering Off the Server” on page 2-3.
2. Disconnect the power cords from the server.
Caution – Before handling components, attach an ESD wrist strap to the grounding
post that is built into the rear of the chassis (see
FIGURE 1-2 on page 1-5 or FIGURE 1-6 on
page 1-9 for the location). PCBs and drivess are extremely sensitive to static electricity.
3. If the server is in a rack, slide it far enough from the rack so that you can
remove the main cover. If you cannot safely view and access the motherboard,
remove the server from the rack.
4. Remove the main cover from the server.
See Section 3.5, “Removing the Main Cover of the Sun Fire X4100/X4100 M2
Server” on page 3-6 or Section 3.8, “Removing the Main Cover of the Sun Fire
X4200/X4200 M2 Servers” on page 3-10.
5. Install the shorting jumper across the TP51/TP52 or J9 header pins.
See
FIGURE 2-8 or FIGURE 2-9 for the jumper location.
6. Wait 10 seconds, then remove the shorting jumper.
This jumper removes battery power from the SouthBridge chipset where the
CMOS settings are stored, thereby removing the CMOS settings.
7. Reinstall the main cover to the server.
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