Diskette drive damage caused by pressure on the diskette drive cover, foreign material in the drive, or the insertion of a diskette with multiple labels

Damaged or bent diskette eject button

Fuses blown by attachment of a nonsupported device

Forgotten computer password (making the computer unusable)

Sticky keys caused by spilling a liquid onto the keyboard

Use of an incorrect ac power adapter on laptop products

The following symptoms might indicate damage caused by nonwarranted activities:

Missing parts might be a symptom of unauthorized service or modification.

If the spindle of a hard disk drive becomes noisy, it may have been subject to excessive force, or dropped.

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 30

“Checking operational charging” on page 31

“Checking the battery pack” on page 31

Checking the ac power adapter

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

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 31

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 figure:

Pin

Voltage (V dc)

 

 

1

+20

 

 

2

0

 

 

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

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

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

Replace the system board.

If the problem persists, go to Chapter 5 “Lenovo B575e” on page 37.

30Hardware Maintenance Manual

Page 36
Image 36
Lenovo B575E manual Power system checkout, Checking the ac power adapter

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.