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Chapter 7: Troubleshooting and Support
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
2. Remove the cover of the chassis to access the motherboard.
3.
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.
JBT1 contact pads
7.8 BMC Reset
The BMC can be reset using the UID button.
•
Reset – Press and hold the UID 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 UID 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.
BMC Reset Options
Event
UID LED
BMC Heartbeat LED
Reset
Blue, Blinks at 2Hz
Green, solid
Restore
Defaults
Blue, Blinks at 4Hz
Off
Update
Blue, Blinks at 10Hz
