Lenovo 20S7S02U00 Hardware Maintenance Manual Download

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you to test computer memory and internal storage devices, view system information, and check and recover
the internal storage devices. To use the bootable diagnostic programs, you can create a bootable diagnostic
medium on a USB device or CD.

To create a bootable diagnostic medium, do the following:

1. Go to

https://www.lenovo.com/diags

2. Click

Lenovo Bootable Diagnostics

3. Follow the instructions on the Web site to create a bootable diagnostic medium on a USB device or CD.

To use the diagnostic medium you have created, do one of the following:
• If you have created the bootable diagnostic medium on a USB device, do the following:

1. Attach the USB device to the computer.

2. Turn on the computer. If the computer cannot be turned on, go to “Power system checkout” on page

28, and check the power sources. If an error code is displayed, go to “Symptom-to-FRU index” on
page 37 for error code descriptions and troubleshooting hints.

3. When the ThinkPad logo is displayed, repeatedly press and release the F12 key. When the Boot Menu

window opens, release the F12 key.

4. Use the arrow keys to select

USB HDD

and then press Enter. The diagnostic program will be

launched automatically.

5. Follow the instructions on the screen to use the diagnostic program.

• If you have created the bootable diagnostic medium using a disc, do the following:

1. Turn on the computer. If the computer cannot be turned on, go to “Power system checkout” on page

28, and check the power sources. If an error code is displayed, go to “Symptom-to-FRU index” on
page 37 for error code descriptions and troubleshooting hints.

2. Insert the disc into the optical drive.

3. Restart the computer.

4. When the ThinkPad logo is displayed, repeatedly press and release the F12 key. When the Boot Menu

window opens, release the F12 key.

5. Use the arrow keys to select

ATAPI CDx

(x: 0, 1, ...) and then press Enter. The diagnostic program

launches.

6. Follow the instructions on the screen to use the diagnostic program.

Power system checkout

To verify if a battery and ac power adapter are functional, do the following:

1.  Turn off the computer.
2.  Connect the ac power adapter.
3.  Turn on the computer. If the computer can be turned on, it means that either the battery or the ac power

adapter is functional.

4. Insert a straightened paper clip into the emergency reset hole to reset the computer. If the computer is

still powered on, it means that the ac power adapter is functional.

5. Turn off the computer.
6. Disconnect the ac power adapter and turn on the computer. If the computer can be turned on, it means

the battery is functional.

If you suspect a power problem, see the appropriate one of the following power supply checkouts:
•  “Checking the ac power adapter” on page 29
•  “Checking the battery and operational charging” on page 29
•  “1160 Coin-cell battery” on page 80

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