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7.7 CMOS Clear
JBT1 is used to clear CMOS, which will also clear any passwords. Instead of pins, this jumper
consists of contact pads to prevent accidentally clearing the contents of CMOS.
To Clear CMOS
1. First
power down
2.
Remove the cover
3.
Remove the onboard battery
4. Short the CMOS pads with a metal object such as a small screwdriver for at least four
seconds.
5. Remove the screwdriver or shorting device.
6. Replace the cover, reconnect the power cords, and power on the system.
Notes: Clearing CMOS will also clear all passwords.
Do not use the PW_ON connector to clear CMOS.
7.8 BMC Reset
The BMC can be reset using the UID button.
•
Reset – Press and hold the button. After six seconds, the LED blinks at 2Hz. The BMC
resets and the reset duration is ~250 ms. Then the BMC starts to boot.
•
Restore factory default configuration – Hold the button for twelve seconds. The LED blinks
at 4Hz while defaults are configured. Note: All BMC settings including username and
password will be removed except the FRU and network settings.
Firmware update – When the BMC firmware is being updated, the UID LED blinks at 10Hz.
Event
Reset
Restore
Defaults
Update
the system completely.
of the chassis to access the motherboard.
from the motherboard.
BMC Reset Options
UID LED
Blue, Blinks at 2Hz
Blue, Blinks at 4Hz
Blue, Blinks at 10Hz
102
Chapter 7: Troubleshooting and Support
JBT1 contact pads
BMC Heartbeat LED
Green, solid
OFF
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Table of Contents
Troubleshooting
