Lenovo 20RK, Hardware Maintenance Manual

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The supervisor password protects the system information stored in the UEFI BIOS menu. It provides the
following security features:
• If only a supervisor password is set, a password prompt is displayed when you try to start the UEFI BIOS
menu. Unauthorized users cannot change most of the system configuration options in the UEFI BIOS
menu program without the password.
• The system administrator can use the supervisor password to access a computer even if the user of that
computer has set a power-on password. The supervisor password overrides the power-on password.
• The system administrator can set the same supervisor password on many ThinkPad computers to make
administration easier.
Attention: If the supervisor password has been forgotten and cannot be made available to the service
technician, there is no service procedure to reset the password. The system board must be replaced for a
scheduled fee.
To set, change, or remove a password:
Note: Before you start, print these instructions and the instructions on “UEFI BIOS menu” of the User Guide .
You also can screen-capture the instructions and send the pictures to your smartphone or notebook
computer so that you can view the instructions during operation.
1. Save all open files, and exit all apps.
2. Restart the computer. When the logo screen is displayed, tap the prompt to display the Startup Interrupt
Menu window. In the Startup Interrupt Menu window, tap F1 to enter the UEFI BIOS menu.
3. Tap Security
➙
Password .
4. Tap supervisor password and follow the instructions on the screen.
5. Save configuration changes and exit.
Symptom-to-FRU index
This section contains following information:
• “Numeric error codes” on page 32
• “Intermittent problems” on page 32
• “Undetermined problems” on page 33
The symptom-to-FRU index in this section lists symptoms and errors and their possible causes. The most
likely cause is listed first, in boldface type.
Note: Do the FRU replacement or other actions in the sequence shown in the column headed “FRU or
action, in sequence.” If replacing a FRU does not solve the problem, put the original part back in the
computer. Do not replace a nondefective FRU.
This index can also help you determine, during regular servicing, what FRUs are likely to be replaced next.
A numeric error is displayed for each error detected in POST or system operation. In the displays, n can be
any number.
If no numeric code is displayed, check the narrative descriptions of symptoms. If the symptom is not
described there, go to “Intermittent problems” on page 32.
Note: For a device not supported by diagnostic codes in the ThinkPad computers, see the manual for that
device.
Chapter 4
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Related service information
31