Checkout Guide
Checking the Backup Battery: Do the following:
1. Power off the computer and unplug the AC Adapter
from the computer.
2. Turn the computer upside down.
3. Remove the backup battery (see “Removal and
Replacement” section of each model).
4. Measure the voltage of the backup battery. See the
following figure.
Note: Be careful not to measure the wrong side of
the backup battery.
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
System Board and CPU Card Checkout
The processing functions are performed by both the
system board and the CPU card. Processor problems can
be caused by either FRU. However, the CPU card
generally has a lower probability of failure. If a numeric
code indicates the system board or the CPU card as a
failing FRU, or the CPU card is indicated by a diagnostic
test by showing FRU code 11, use the following procedure
to isolate the problem:
1. Run the system board test to verify the symptom.
This test verifies both the system board and the CPU
card. If no error is detected, return to “Checkout
Guide” on page 30.
Note: Don't touch the keyboard and pointing device
when the system board test is running. This
might cause an unexpected error.
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