CHAPTER 4: Troubleshooting

Testing the memory

Memory errors can stop your programs, show error messages on the screen, or hang the system.

To test the memory:

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

2Run the Memory Test and see if the test completes successfully.

3Press F2 in the test items.

4Follow the instructions in the message window.

Important

Make sure that each memory card is fully installed into the connector.

A loose connection can cause an error.

Testing the power system

To test for a power problem:

Turn on the notebook using each of the following power sources:

Remove the battery pack, connect the power adapter, then make sure that the notebook turns on using AC power.

Disconnect the power adapter, install a charged battery pack, then make sure that power is supplied by the battery pack.

If you suspect a power problem, complete the appropriate power supply check:

“Check the power adapter” on page 118

“Check the battery pack” on page 119

Check the power adapter

Unplug the power adapter cable from the notebook and measure the output voltage at the power adapter cable plug. See the following figure.

Pin 1: +19 to +20.5V

Pin 2: 0V, Ground

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

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

Replace the system board.

If the problem is not corrected, see “Undetermined problems” on page 133.

If the power-on indicator does not light up, check the power adapter’s power cord for correct continuity and installation.

If the operational charge does not work, see “Check the battery pack” on page 119.

Important

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

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Acer ENTJ77, ENTJ75, ENTJ78, ENTJ76 manual 118, Testing the memory, Testing the power system

ENTJ78, ENTJ77, ENTJ76, ENTJ75 specifications

The Acer ENTJ series, comprising models ENTJ75, ENTJ76, ENTJ77, and ENTJ78, represents a significant leap in technology and performance within the Acer family of products. These models are designed to cater to a range of users, from professionals to gamers, featuring advanced specifications, innovative technologies, and a commitment to enhancing user experience.

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