Table of Contents
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Utility
v Run External Tests
v Surface Scan Hard Disk
v Benchmark System
v DOS Shell
v Tech Support Form
v Battery Rundown
v View Test Log
v Print Log
v Save Log
v Full Erase Hard Drive
v Quick Erase Hard Drive
Power system checkout
To verify a symptom, do the following:
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the ac adapter.
4. Check that power is supplied when you turn on the computer.
5. Turn off the computer.
6. Disconnect the ac adapter and install the charged battery pack.
7. Check that the battery pack supplies power when you turn on the computer.
If you suspect a power problem, see the appropriate one of the following power
supply checkouts:
v "Checking the ac adapter"
v "Checking operational charging" on page 30
v "Checking the battery pack" on page 30
v "Checking the backup battery" on page 31
Checking the ac adapter
You are here because the computer fails only when the ac adapter is used.
v If the power problem occurs only when the ThinkPad Essential Port Replicator
is used, replace the port replicator.
v If the power-on indicator does not turn on, check the power cord of the ac
adapter for correct continuity and installation.
v If the computer does not charge during operation, go to "Checking operational
charging."
To check the ac adapter, do the following:
1. Unplug the ac adapter cable from the computer.
2. Measure the output voltage at the plug of the ac adapter cable. See the
following figure:
3
2
1
(20V)
Note: Output voltage of pin no.2 of the ac adapter may different from the one
you are servicing.
Pin
Voltage (V dc)
1
+20
2
0
3
Ground
General descriptions
Checkout guide
29
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