Lenovo ThinkPad Edge E135 Hardware Maintenance Manual - Page 32

Power system checkout, Checking the ac power adapter, Checking the backup battery

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3. Follow the instructions on the Web site to create a bootable diagnostic medium on a USB device. To use the diagnostic medium you have created, 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 26, and check the power sources. If an error code is displayed, go to "Symptom-to-FRU index" on page 33 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. Power system checkout To verify a symptom, do the following: 1. Turn off the computer. 2. Remove the battery pack. 3. Connect the ac power adapter. 4. Check that power is supplied when you turn on the computer. 5. Turn off the computer. 6. Disconnect the ac power adapter and install the charged battery pack. 7. Check that the battery pack supplies power when you turn on the computer. If you suspect a power problem, see the appropriate one of the following power supply checkouts: • "Checking the ac power adapter" on page 26 • "Checking operational charging" on page 27 • "Checking the battery pack" on page 27 • "Checking the backup battery" on page 27 Checking the ac power adapter If you computer fails only when the ac power adapter is used, use the instructions in this topic. • If the power-on indicator does not turn on, check the power cord of the ac power adapter for correct continuity and installation. • If the computer does not charge during operation, go to "Checking operational charging" on page 27. To check the ac power adapter, do the following: 1. Unplug the ac power adapter cable from the computer. 2. Measure the output voltage at the plug of the ac power adapter cable. See the following illustration: 3 2 1 (20V) Pin Voltage (V dc) 1 +20 2 0 3 Ground Note: Output voltage across pin 2 of the ac power adapter might differ from the one you are servicing. 3. If the voltage is not correct, replace the ac power adapter. 4. If the voltage is acceptable, replace the system board. 26 Hardware Maintenance Manual

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3. Follow the instructions on the Web site to create a bootable diagnostic medium on a USB device.
To use the diagnostic medium you have created, 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 26,
and check the power sources. If an error code is displayed, go to “Symptom-to-FRU index” on page 33
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.
Power system checkout
To verify a symptom, do the following:
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the ac power adapter.
4. Check that power is supplied when you turn on the computer.
5. Turn off the computer.
6. Disconnect the ac power adapter and install the charged battery pack.
7. Check that the battery pack supplies power when you turn on the computer.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
•
“Checking the ac power adapter” on page 26
•
“Checking operational charging” on page 27
•
“Checking the battery pack” on page 27
•
“Checking the backup battery” on page 27
Checking the ac power adapter
If you computer fails only when the ac power adapter is used, use the instructions in this topic.
•
If the power-on indicator does not turn on, check the power cord of the ac power adapter for correct
continuity and installation.
•
If the computer does not charge during operation, go to “Checking operational charging” on page 27.
To check the ac power adapter, do the following:
1. Unplug the ac power adapter cable from the computer.
2. Measure the output voltage at the plug of the ac power adapter cable. See the following illustration:
Pin
Voltage (V dc)
1
+20
2
0
3
Ground
1
2
3
(20V)
Note:
Output voltage across pin 2 of the ac power adapter might differ from the one you are servicing.
3. If the voltage is not correct, replace the ac power adapter.
4. If the voltage is acceptable, replace the system board.
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Hardware Maintenance Manual