Memory VRMs
Preparing the system to remove and replace a memory voltage regulator
module
To prepare the system to remove and replace a memory voltage regulator module, complete the steps in
this procedure.
Procedure
1. Identify the part and the system that you are working on. For instructions, see Identifying a
part (www.ibm.com/support/knowledgecenter/POWER9/p9haj/sal.htm).
Use the blue identify LED on the enclosure to locate the system. Ensure that the serial number of the
system matches the serial number to be serviced.
2. Stop the system. For instructions, see Stopping a system (www.ibm.com/support/knowledgecenter/
POWER9/p9haj/crustopsys.htm).
3. Open the rear rack door, if necessary.
4. Label and disconnect both UPIC cables from the system control unit.
UPIC cable locations are P1-C1-T1 and P1-C2-T1.
a. Remove the white plastic lock (A) from the plug housing.
Figure 208. Removing the UPIC cable lock
b. Push down on the blue cable latch (B) and pull out the UPIC cable from the system control unit.
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