Technical data

Fault Isolation 4-77
Procedure 4-10. Calendar Battery Checkout for Model 400s Systems That Use Domain
Compatible Mode
Start this procedure with the system power off.
1. Turn on the system unit and the monitor. If the calendar backup battery is not
working (incorrectly seated, or dead), you see an incorrect date printed in one of
the messages shown in Figure 4-26.
NOTICE: You may see the third message the first time you
boot the system or if the clock has never been set.
Figure 4-26. Calendar Battery Message
2. Turn off the system unit and unplug its ac power cord from the wall outlet.
Remove the top cover from the system unit.
3. Check to see if the calendar backup battery is properly seated on the CPU board.
If the battery is seated properly, replace it. If it is not seated properly, seat it cor
-
rectly and replace the system unit cover. Plug in the ac power cord and turn on the
system again. If the error message does not appear, the problem is fixed. If the
error message appears again, the battery must be replaced. Refer to the battery
replacement procedure in Chapter 5.
end of procedure