Testing The Memory; Testing The Power System - Packard Bell ENTJ75 Service Manual

Testing the memory

Testing the power system

118
CHAPTER 4: Troubleshooting
Memory errors can stop your programs, show error messages on the screen, or
hang the system.
To test the memory:
1
Boot from the diagnostics diskette and start the diagnostics program.
2
Run the Memory Test and see if the test completes successfully.
3
Press F2 in the test items.
4
Follow 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.
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.
•
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
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,
on page 119.
Important
An audible noise from the power adapter does not always indicate
a defect.
Pin 1: +19 to +20.5V
Pin 2: 0V, Ground
"Undetermined problems" on page
see "Check the battery pack"