Checking the ac adapter

You are here because the computer fails only when the ac adapter is used.

•If the power problem occurs only when the docking station or the port replicator is used, replace the docking station or the port replicator.

•If the power-on indicator does not turn on, check the power cord of the ac adapter for correct continuity and installation.

•If the computer does not charge during operation, go to “Checking operational charging” on page 33.

To check the ac adapter, do the following:

1.Unplug the ac adapter cable from the computer.

2.Measure the output voltage at the plug of the ac adapter cable. See the following figure:

3

2

1

(20V)

Pin

Voltage (V dc)

1+20

20

3Ground

Note: Output voltage of pin no.2 of the ac adapter may different from the one you are servicing.

3.If the voltage is not correct, replace the ac adapter.

4.If the voltage is acceptable, do the following:

•Replace the system board.

•If the problem persists, go to “FRU tests” on page 31.

Note: Noise from the ac adapter does not always indicate a defect.

Checking operational charging

To check whether the battery charges properly during operation, use a discharged battery pack or a battery pack that has less than 50% of the total power remaining when installed in the computer.

Perform operational charging. If the battery status indicator or icon does not turn on, remove the battery pack and let it return to room temperature. Reinstall the battery pack. If the charge indicator or icon still does not turn on, replace the battery pack.

If the charge indicator still does not turn on, replace the system board. Then reinstall the battery pack. If it is still not charged, go to the next section.

Checking the battery pack

Battery charging does not start until the Power Manager Battery Gauge shows that less than 96% of the total power remains; under this condition the battery pack can charge to 100% of its capacity. This protects the battery pack from being overcharged or from having a shortened life.

To check your battery, move your cursor to the Power Manager Battery Gauge icon in the icon tray of the Windows taskbar and wait for a moment (but do not click), and the percentage of battery power remaining is displayed. To get detailed information about the battery, double-click the Power Manager Battery Gauge icon.

Chapter 3. General checkout 33

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Lenovo W520, T520 manual Checking the ac adapter, Checking operational charging, Checking the battery pack, Pin Voltage V dc
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T520, W520, 4284WW9PC10B371, T520i specifications

The Lenovo T520i is a robust business laptop that caters to professionals seeking reliability and performance. Part of Lenovo's ThinkPad series, specifically the model number 4284WW9PC10B371, it is designed for multitasking efficiency and mobility.

One of the defining features of the T520i is its impressive performance capabilities. It is equipped with Intel's second-generation Core processors, ranging from i5 to i7, which provide ample power for demanding applications and multitasking scenarios. This model supports up to 16GB of RAM, ensuring smooth operation even with multiple applications running simultaneously.

The T520i features a 15.6-inch high-definition display, offering users a resolution of 1366 x 768 pixels. For those who require superior screen clarity and vibrant color reproduction, the laptop can be upgraded to a Full HD (1920 x 1080) display option. This attribute is especially valuable for professionals working in design or media fields who need precise visuals.

Another characteristic that sets the T520i apart is its durable build quality. As a ThinkPad, it has undergone rigorous testing to meet military-grade standards for durability and reliability. The spill-resistant keyboard and robust chassis are designed to withstand the rigors of everyday use, making it ideal for professionals on the go.

Storage options for the T520i are versatile, with configurations available for traditional hard drives and solid-state drives (SSD). The SSD option not only enhances the overall speed of the system but also improves boot times and application loading, significantly contributing to productivity.

Connectivity options on the T520i are comprehensive. It comes with multiple USB ports, including USB 3.0 for fast data transfer. Additionally, integrated features such as a Gigabit Ethernet port, VGA output for external monitors, and optional 4G LTE connectivity ensure seamless communication and access to networks.

The laptop also boasts Intel HD Graphics, offering sufficient power for everyday tasks, video playback, and light gaming. Furthermore, the inclusion of technologies such as Bluetooth and an integrated webcam enriches user experience through enhanced connectivity and multimedia capabilities.

In conclusion, the Lenovo T520i, with its powerful processors, impressive display options, and rugged design, is a capable choice for professionals who require a reliable, high-performance laptop. Ideal for both business and personal use, it exemplifies Lenovo’s commitment to quality and innovation in the laptop market.
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