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Power | System | Checkout |
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To verify the symptom of | the problem power on th | ||
puter | using | each of the | following power sources: |
1.Remove the battery.
2.Connect the AC Adapter and check that power plied.
3.Disconnect the AC Adapter and install the cha battery; then check that power is supplied b battery.
If you suspect a power problem, refer the the power supply check listed below:
Ÿ “Checking the AC Adapter”
Ÿ “Checking the Operational Charging” on page 33
Ÿ“Checking the Battery” on page 33
Checking the AC Adapter: | You are here |
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because the computer fails only when the | AC Adap | ||
used: |
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Ÿ If the power problem | occurs | only when | the Th |
Port Replicator with Advanced | Etherjet | Feature. |
ŸIf the
power cord of the AC Adapter for correct c and installation.
ŸIf the operational charge does not work, go “Checking the Operational Charging” on page 33.
Unplug the AC Adapter cable from the computer an measure the output voltage at the plug of the A cable. See the following figure.
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Pin |
| Voltage | (V | dc) |
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1 |
| +15.5 | to | +17.0 |
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2 |
| Ground |
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If | the voltage is not correct, replace the AC |
If the voltage is within the range, do the fol
Ÿ Replace the
Ÿ Replace the system board.
ŸIf the problem is not corrected, go to “Und Problems” on page 45
Note: An audible noise from the AC Adapter does n
always indicate a defective adapter.
32 ThinkPad 390X / i 1700 HMM