376 IBM eX5 Implementation Guide
2. The numbers on the switch block represent the OFF side of the switch. Locate switch 5,
which is the RTC switch. To clear the CMOS, remove the plastic sheet from the jump
block, as shown in Figure 8-3 on page 375. Set switch 5 on switch block SW2 to the ON
position for 5 seconds and then return it back to the OFF position.
CMOS battery removal option
Use the following procedure to clear the CMOS by removing the CMOS battery:
1. Remove the ac power from the server.
2. Locate the CMOS battery, as highlighted in Figure 8-4.
Figure 8-4 CMOS battery location
3. Use your finger to pry up the battery on the side toward the second processor. It is easy to
lift the battery out of the socket.
4. Wait 30 seconds and then insert one edge of the battery, with the positive side up, back
into the holder.
5. Push the battery back into the socket with your finger and it will clip back into place.
8.1.3 Verifying the server boots before adding options
When you have ordered options for your server that have not yet been installed, it is a good
idea to make sure that the server will complete the POST properly before you start to add the
options. Performing this task makes it easier to compartmentalize a potential problem with an
Light path diagnostics: The light path diagnostics (LPD) lights are powered from a
separate power source (a capacitor) than the CMOS memory. LPD lights remain lit for a
period of time after the ac power and the CMOS memory battery have been removed.
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