Providing Power; Ac Adapter - IBM ThinkPad 755CX Manual

Providing Power

Providing Power

Note:
When the AC Adapter is connected,
and the remaining power of the
installed battery pack is less than a
certain amount, discharging and
then charging of the battery pack
starts automatically.
Warning:
Always use the AC Adapter
certified by IBM in the country
where you will be using the
computer. Operating the
computer with an incorrect AC
Adapter can cause damage to the
battery pack and to the computer.
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IBM ThinkPad 755CX User's Guide
Your computer can be operated with the AC Adapter, battery pack,
or Car Battery Adapter (available as an option).

AC Adapter

The AC Adapter is an alternating-current-to-direct-current (ac-to-dc)
converter that supplies power for the computer. The AC Adapter
also charges the battery pack when the battery pack is installed in
the computer. The input rating for the AC Adapter is 100–240 V ac,
50/60 Hz.
CAUTION:
Do not attempt to open the AC Adapter case. The AC Adapter
is permanently sealed and cannot be repaired.
If you turn on the computer when the battery pack is installed, you
will hear a short beep when you connect or disconnect the AC
Adapter from the computer. This short beep means that the power
source has been changed.
When the AC Adapter cable is disconnected from the computer with
a battery pack installed, the LCD brightness decreases slightly to
conserve battery power.