If the voltage is more than +4.0 V dc, power-off
the computer, replace the standby battery, and
go to the next step.
9. Ensure that the AC Adapter is plugged into the
computer; then power on the computer.
10. Charging of the standby battery starts immediately. A
depleted battery needs approximately 30 minutes to
be recharged to the operational voltage of +3.5 V dc.
11. Unplug the AC Adapter.
12. 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. If the system does not resume
after a charged battery pack is installed,
replace the DC/DC card.
If replacing the DC/DC card does not resolve
the problem, replace the system board.
Common Device Checkout
If a common device problem is suspected, see the
appropriate power supply check in the following list:
“Port Replicator Checkout”
“External Display Self-Test”
Port Replicator Checkout: Use the following
procedure to isolate a port replicator problem.
1. Power off the computer.
2. Remove the failing devices from the replicator.
3. Unplug the AC adapter from the replicator, if
attached.
4. Remove the port replicator from the computer.
5. Reconnect the failing device directly to the computer.
(If another device is already connected to the
computer, remove it first.)
6. Go to the “Running the Diagnostics” on page 449 and
run the diagnostics.
7. If the advanced diagnostic device test does not find
an error, suspect a problem with the port replicator of
the system expansion bus.
8. Power off the computer and reconnect the port
replicator.
9. Power on the computer and run the following
advanced diagnostic tests:
Serial port test with the wrap plug installed on
the replicator
Parallel port test with the wrap plug installed on
the replicator
FDD-2 device test on the failing device with a
scratch diskette
10. If diagnostic errors appear, replace the replicator or
diskette drive attachment unit.
428 IBM Mobile Systems HMM
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