IBM ThinkPad 340 Series Hardware Maintenance Manual page 145

Power Systems Checkout
To verify the symptom of the problem, power-on the
computer using each of the power sources available as
follows:
1. Remove the battery.
2. Connect the AC adapter and check that power is
supplied by pressing the power switch.
3. Disconnect the AC adapter and install the charged
battery; then, check that power is supplied from the
battery by pressing the power switch.
Note: The battery is charged only while the computer is
powered-on (the computer can be in the suspend
mode). The battery cannot be charged if the
computer is powered-off.
If you suspect a power problem, see the appropriate
power-supply check listed below:
"Checking the AC Adapter."
"Checking the Battery Pack" on page 136.
"Checking the Standby Battery" on page 137.
Checking the AC Adapter:
adapter if the computer fails only when the AC adapter is
used, or if the battery does not charge when the AC
adapter is attached and the computer is on or in suspend
mode.
If the power problem occurs only when the
MultiPort II is used, replace the MultiPort II.
If the power-on indicator does not turn on, check the
AC adapter for correct continuity and installation. If
the connection is suspect, replace the AC adapter.
If the operational charge does not work, go to "Power
Related Symptoms" on page 149.
Note: Several types of AC adapters can be supplied with
the ThinkPad 701C/701CS. The procedure for
checking them is the same.
1. Unplug the AC adapter cable from the computer and
measure the output voltage at the plug of the AC
adapter cable. See the following figure.
Pin
1
2
2
Voltage (V dc)
+15.5 to +17.0
Ground
ThinkPad 701C/701CS (2630)
Check the AC
1
135