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Symptoms (Verified) Go to
Other symptoms Appropriate check
instructions in this section,
then use appropriate tables
in “Symptom-to-FRU Index”
on page 17.
Power Systems Check
To verify the symptom of the problem, power on the com-
puter using each of the power sources as follows:
1. Remove the battery pack, diskette drive, and hard
disk drive.
2. Connect the AC Adapter and check that power is sup-
plied.
3. Install the diskette drive or hard disk drive one at a
time, and check that power is supplied from each
power source.
If you suspect a power problem, refer to the appropriate
power supply check listed below:
“Checking the AC Adapter”
“Checking the Operational Charging” on page 7
“Checking the Battery Pack” on page 7
Checking the AC Adapter: If the computer fails
only when the AC Adapter is used or if the power-on indi-
cator of the AC Adapter does not turn on, make sure of the
following:
Power cord is not damaged.
Power cord is securely connected to the AC Adapter
and AC power outlet.
If the above confirmation does not solve the problem,
replace the AC Adapter.
If the power-on indicator of the AC Adapter is on, then
proceed to the next step.
1. Unplug the AC Adapter cable from the computer and
measure the output voltage at the plug of the AC
Adapter cable.
Pin Voltage (V dc)
1 19.0 20.5
2 Ground
6 ThinkPad i Series 1400