CHECKOUT GUIDE
4. Measure the voltage of the backup battery. See the
following figure.
If the voltage is correct, replace the system board.
If the voltage is not correct, replace the backup
battery.
If the backup battery discharges quickly after
replacement, replace the system board.
Wire Voltage (V dc)
Red +2.5 to +3.2
Black Ground
Port replicator checkout
Use the following procedure to isolate a port replicator
problem. The port replicator attaches to the system
expansion connector at the rear of the computer:
1. Power off the computer.
2. Remove the failing devices from the port replicator.
3. Unplug the AC Adapter from the port replicator, if it is
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 “Testing the computer” on page 8 and run the
diagnostics.
7. If the advanced diagnostic device test does not find
an error, suspect a problem with the port replicator.
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 port replicator
Universal serial bus test with the USB parallel
test cable
Parallel port test with the wrap plug installed on
the port replicator
10. If diagnostic errors appear, replace the port replicator
or the diskette drive. If the problem remains after the
replacement, replace the system board.
11. If power problems appear only when the port
replicator is used, replace the port replicator.
13
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