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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 36.
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 chekc that power is uspplied from each
power source.
If you suspect a power problem, refer the the appropriate
power supply check listed below:
“Checking the AC Adapter”
“Checking the Operational Charging” on page 26
“Checking the Battery Pack” on page 26
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
ThinkPad i Series 1400 (Part I) 25