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+
−
If the voltage is less than +4.0 V dc, replace the
system board.
If the voltage is more than +4.0 V dc, power-off
the computer, replace the standby battery, and
go to the next step.
6. Ensure that the AC Adapter is plugged into the
computer; then power-on the computer.
7. Charging of the standby battery starts. A depleted
battery needs approximately 30 minutes to be
recharged to the operational voltage of +3.5 V dc.
8. Unplug the AC Adapter.
9. Verify the standby battery function by removing and
installing the battery pack during suspend mode.
Note: Removing and installing the battery pack
during suspend mode should be done within
one minute.
The resume operation must start. If the resume
operation does not work, switching of power from the
battery pack to standby battery will not be correct.
Replace the system board.
Power Management Features
Two power management modes are provided by the
computer to save power consumption and prolong battery
power. For the details of the two modes, see the latest
volume of the Hardware Maintenance Manual for ThinkPad
computers.
Standby Mode:
following occurs:
The LCD backlight turns off.
The hard disk motor stops.
Red
Voltage (V dc)
+4.0
Ground
When in standby mode, the
ThinkPad 340x (IBM 2610)
33
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