Cmos Clear - Supermicro SuperServer 420GH-TNGR User Manual

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. Pulling the CPU tray out
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.
the system completely.
of the chassis to access the motherboard.
from the motherboard.
JBT1 contact pads
Chapter 7: Troubleshooting and Support
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