Lenovo ThinkPad T520 Hardware Maintenance Manual

Also see for THINKPAD T520: Deployment guide Deployment guide Guía de despliegue Guide de déploiement Guida alla distribuzione

Contents

• 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 page37, and check the power sources. If an error code is displayed, go to “Symptom-to-FRU index” onpage 45 for error code descriptions and troubleshooting hints.3. When the ThinkPad logo is displayed, repeatedly press and release the F12 key. When the BootMenu window opens, release the F12 key.4. Use the arrow keys to select USB HDD and then press Enter. The diagnostic program will belaunched automatically.5. Follow the instructions on the screen to use the diagnostic program.• If you have created the bootable diagnostic medium on a CD, do the following:1. Turn on the computer. If the computer cannot be turned on, go to “Power system checkout” on page37, and check the power sources. If an error code is displayed, go to “Symptom-to-FRU index” onpage 45 for error code descriptions and troubleshooting hints.2. Insert the CD into the optical drive.3. Restart the computer.4. When the ThinkPad logo is displayed, repeatedly press and release the F12 key. When the BootMenu window opens, release the F12 key.5. Use the arrow keys to select ATAPI CDx (x: 0, 1, ...) and then press Enter. The diagnostic programwill be launched automatically.6. Follow the instructions on the screen to use the diagnostic program.Power system checkoutTo verify a symptom, do the following:1. Turn off the computer.2. Remove the battery pack.3. Connect the ac adapter.4. Check that power is supplied when you turn on the computer.5. Turn off the computer.6. Disconnect the ac 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 37• “Checking operational charging” on page 38• “Checking the battery pack” on page 38• “Checking the backup battery” on page 39Checking the ac power adapterIf you computer fails only when the ac power adapter is used, use the instructions in this topic.• If the power problem occurs only when the docking station or the port replicator is used, replace thedocking station or the port replicator.• If the power-on indicator does not turn on, check the power cord of the ac adapter for correct continuityand installation.• If the computer does not charge during operation, go to “Checking operational charging” on page 38.To check the ac adapter, do the following:1. Unplug the ac adapter cable from the computer.Chapter 3. General checkout 37