NV52/NV54/NV56/NV58 Service Guide - tim.id.au
NV52/NV54/NV56/NV58 Service Guide - tim.id.au
NV52/NV54/NV56/NV58 Service Guide - tim.id.au
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Testing the memory<br />
118<br />
CHAPTER 4: Troubleshooting<br />
Memory errors can stop your programs, show error messages on the screen, or<br />
hang the system.<br />
To test the memory:<br />
1 Boot from the diagnostics diskette and start the diagnostics program.<br />
2 Run the Memory Test and see if the test completes successfully.<br />
3 Press F2 in the test items.<br />
4 Follow the instructions in the message window.<br />
Testing the power system<br />
Important<br />
Make sure that each memory card is fully installed into the connector.<br />
A loose connection can c<strong>au</strong>se an error.<br />
To test for a power problem:<br />
• Turn on the notebook using each of the following power sources:<br />
• Remove the battery pack, connect the power adapter, then make sure<br />
that the notebook turns on using AC power.<br />
• Disconnect the power adapter, install a charged battery pack, then make<br />
sure that power is supplied by the battery pack.<br />
If you suspect a power problem, complete the appropriate power supply check:<br />
• “Check the power adapter” on page 118<br />
• “Check the battery pack” on page 119<br />
Check the power adapter<br />
Unplug the power adapter cable from the notebook and measure the output<br />
voltage at the power adapter cable plug. See the following figure.<br />
Pin 1: +19 to +20.5V<br />
Pin 2: 0V, Ground<br />
• If the voltage is not correct, replace the power adapter.<br />
• If the voltage is within the range, do the following:<br />
• Replace the system board.<br />
• If the problem is not corrected, see “Undetermined problems” on page<br />
133.<br />
• If the power-on indicator does not light up, check the power adapter’s<br />
power cord for correct continuity and installation.<br />
• If the operational charge does not work, see “Check the battery pack”<br />
on page 119.<br />
Important<br />
An <strong>au</strong>dible noise from the power adapter does not always indicate<br />
a defect.