Memory Check

Memory errors might stop system operations, display error messages, or cause the system to hang up. Make sure that the DIMM is properly installed in its slot. A loose connection can cause an error.

If the DIMM connection is correct, run the Doagmpstotics Test.

1.Boot from the diagnostics diskette and start the Doagmpstotics program.

2.Go to the diagnostic memory in the test items.

3.Press F2 in the test items.

4.Follow the instructions in the message window.

Power System Check

To verify the cause of the power problem, power on the computer using the AC adapter, and then the battery pack.

1.Remove the battery pack.

2.Connect the AC adapter and check if power is supplied.

3.Disconnect the AC adapter and install a fully-charged battery pack, and then check if power is supplied. t If the failure is cause by a defective AC adapter, refer to the “Check the AC Adapter” section.

t If the failure is cause by a defective battery pack, refer to the “Check the Battery Pack” section.

Check the AC Adapter

Unplug the AC adapter cable from the computer and measure the output voltage at the plug of the AC adapter cable. Refer the figure below.

Pin 1: + 19 to +20.5V

Pin 2: OV, ground

1.If the voltage is not correct, replace the power adapter.

2.If the voltage is within the range, do the following:

a.Replace the system board.

b.If the problem is not corrected, see the section “Undetermined Problems” on page 81.

c.If the voltage is still not corrected, proceed to the next step.

NOTE: An audible noise from the power adapter does not always indicate a defect.

3.If the power indicator does not light up, check the power cord of the AC adapter for correct continuity and installation.

4.If the operational charge does not work, see the “Check the Battery Pack” section on the next page.

Chapter 4

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Acer 4520 manual Memory Check, Power System Check, Check the AC Adapter

4520 specifications

The Acer 4520 laptop is a versatile and economically accessible device that caters to a wide variety of computing needs. Launched in the mid-2000s, this laptop became particularly popular among students and working professionals, thanks to its balance of performance, portability, and affordability.

One of the standout features of the Acer 4520 is its durable yet lightweight design, which weighs around 2.6 kg. This makes it easy to carry around, whether for commuting to school or taking it to a coffee shop for remote work. The 15.4-inch screen with a resolution of 1280 x 800 pixels provides a decent visual experience, suitable for both productivity tasks and media consumption.

In terms of performance, the Acer 4520 is typically equipped with AMD processors, such as the AMD Turion X2 or Athlon series, which are designed to deliver competent multitasking capabilities. The laptop usually comes with 1GB or 2GB of RAM, allowing users to run essential applications smoothly. Additionally, the device features a 120GB to 250GB hard drive, providing ample storage space for documents, photos, and multimedia files.

Connectivity is another strong point of the Acer 4520. It comes with a variety of ports, including USB 2.0, VGA, and audio jacks, as well as a built-in webcam for video conferencing and social interaction. The laptop supports Wi-Fi connectivity, enabling users to access the internet wirelessly, which is essential for both personal and professional use.

The Acer 4520 also integrates several multimedia features, including a DVD-RW drive for reading and writing optical discs, along with built-in speakers that deliver sound decent enough for casual listening. Additionally, it supports Acer's own PowerSmart technology, which helps manage battery life and optimize performance, allowing users to prolong their usage time during on-the-go scenarios.

Furthermore, the laptop offers a user-friendly operating system, commonly shipped with Windows Vista or later versions, providing a familiar environment for users. Overall, the Acer 4520 stands out with its balanced range of features, reliability, and economical price point, making it an attractive option for budget-conscious individuals seeking a capable laptop for everyday tasks. This blend of utility and performance ensures that the Acer 4520 remains relevant for basic computing needs even years after its initial release.