Checking operational charging

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

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 meter shows that less than 95% 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 meter icon in the icon tray of the Windows® taskbar and wait for a moment (but do not click it), and the percentage of battery power remaining is displayed. To get detailed information about the battery, double-click the power meter icon.

Note: If the battery pack becomes hot, it may not be able to be charged. Remove it from the computer and leave it at room temperature for a while. After it cools down, reinstall and recharge it.

To check the battery pack, do the following:

1.Power off the computer.

2.Remove the battery pack and measure the voltage between battery terminals 1 (+) and 7 (-). See the following figure:

Terminal	Voltage (V dc)

1	+ 0 to + 14

7	Ground (-)

3.If the voltage is less than +11.0 V dc, the battery pack has been discharged.

Note: Recharging will take at least 3 hours, even if the indicator does not turn on. If the voltage is still less than +11.0 V dc after recharging, replace the battery.

4.If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 5 and 7. The resistance must be 4 to 30 K Ω.

If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board.

Chapter 3. General checkout 31

B575E specifications

The Lenovo B575E is a reliable and cost-effective laptop designed primarily for business users and students who need a dependable device for everyday tasks. It brings a solid mix of performance, portability, and essential features that cater to the needs of individuals on a budget.

At its core, the B575E is powered by AMD's E-series processors, which provide adequate performance for handling basic computing tasks like web browsing, document editing, and multimedia consumption. This entry-level configuration is perfect for users who do not require intensive graphics capabilities or high-end processing power.

One of the standout features of the Lenovo B575E is its 15.6-inch display. The screen boasts a resolution of 1366 x 768 pixels, which while standard, offers decent clarity and brightness for everyday usage. The anti-glare technology reduces reflections and allows users to work comfortably in various lighting conditions.

In terms of memory, the B575E typically comes with 4 GB of RAM, which is expandable for users who require additional multitasking capabilities. With a standard hard drive capacity, users can choose models with up to 500 GB of storage, providing sufficient space for documents, applications, and media files.

The design of the B575E is pragmatic and functional, featuring a sturdy casing that can withstand regular use. Weighing around 5.5 pounds, it is portable enough for users who need to carry their laptops to meetings or classes.

Connectivity options are user-friendly, as the laptop includes USB 2.0 and USB 3.0 ports, HDMI output, and an SD card reader, enabling users to connect various peripherals and external displays easily. The built-in webcam and microphone support video conferencing, a feature that has become increasingly important in today’s remote work and education environments.

The battery life of the Lenovo B575E is commendable, providing several hours of productivity on a single charge, which is essential for users who are frequently on the move.

Overall, the Lenovo B575E stands out as a practical choice for budget-conscious consumers looking for a functional laptop that meets the basic demands of everyday computing without sacrificing performance. With its reliable construction, satisfactory specifications, and essential features, it remains a competitive option in the entry-level laptop market.