IBM Power System 8247-42L Manual page 47

Figure 31. Removing the system processor socket cover
7. Remove dust and debris from the system processor socket in the replacement system backplane.
a. If dust or debris is present on the system processor socket, use the supplied air pump (part
number 45D2645) to clean the socket. If your air pump is not assembled as shown in Figure 32
on page 30, fasten the tip onto the bulb. Blow small bursts of air from the center toward the sides
of the socket, as shown Figure 32 on page 30.
b. Repeat step 7 for the remaining system processor socket.
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System backplane