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8. 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.
9. Unplug the AC Adapter.
10. 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 DC/DC card.
If replacing the DC/DC card does not resolve the
problem, replace the system board.
Power Management Features
Three power management modes are provided by the
computer to save power consumption and prolong battery
power.
Standby Mode: When in standby mode the following
occurs:
The LCD backlight turns off.
The hard disk motor stops.
The CPU clock is set to the lowest speed.
Events that cause entering of standby mode:
Standby requested by the Fn key. (Fn+F3)
No activity under auto-standby enabled by the
feature utility.
Events that cause exiting or resuming of standby mode:
(Resume) Any key operation.
Suspend Mode: When in suspend mode, the
following, in addition to the four actions of standby mode,
occur:
The LCD power is powered-off.
The hard disk is powered-off.
The CPU is stopped.
In the ThinkPad Features Program, the computer can be
set to “Will not suspend even if LCD is closed.”.
When the computer is powered with ac power and is used
with one of the following IBM PC cards, the computer
enters
standby mode
; the PC card and application program
remain active.
3270 Emulation Credit Card Adapter
5250 Emulation Credit Card Adapter
Token-Ring 16/4 Credit Card Adapter
Credit Card Adapter for Ethernet
ThinkPad 355x, 360x, 370C, 750x, 755C, 755Cs
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