Allen-Bradley 6177R-MM, User Manual

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Rockwell Automation Publication 6177R-UM002E-EN-P - March 2017 87
Troubleshoot the System Chapter 6
Clear the UEFI You must clear the system configuration values that are stored in the UEFI if
the following conditions are present:
• The system configuration has been corrupted
• An incorrect setting has caused error messages to be unreadable
• You cannot access the UEFI set-up utility to load the system defaults
Follow these steps to clear the UEFI.
1. Back up all system data and then shut down the computer.
2. Follow the steps for Pre-configuration on page 36 .
3. Remove the cover as detailed in Remove the Cover on page 38 .
4. Locate the Clear UEFI (CMOS1)
jumper on the motherboard.
See Figure 5 on page 17 for its location.
5. Remove the jumper block from its
default position (over pins 1 and 2).
6. Place the jumper block over pins 2 and 3
for 10 seconds .
7. Return the jumper block to its default
position.
8. Reinstall the cover as detailed in Reinstall the Cover on page 39 .
9. Follow the steps for Post-configuration on page 37 .
10. During POST, press F2 on an attached keyboard to access the UEFI set-
up utility and reconfigure settings.
IMPORTANT Use an antistatic wriststrap that is connected to a grounded surface.
IMPORTANT The jumper block must be returned to its default position over pins
1 and 2. The computer does not start if you leave the jumper block
over pins 2 and 3.
IMPORTANT When you clear the UEFI, all UEFI settings return to their defaults.
Settings other than default must be reconfigured after the UEFI is
cleared.
1 2 3
Jumper
Block
Default
Position
Clear UEFI
Position
Pins