IBM 7947E3U User Manual page 84

11. Remove hard disk drive backplane 1 from the server.
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System x3650 M2 Types 4199 and 7947: Installation and User's Guide
Configuration
cable
Power
cable
a. From backplane 1, disconnect the following cables in the order listed:
v Power cable 1
v SAS signal cable 2
v Configuration cable 3
b. Lift backplane 1 out of the server by pulling it toward the rear of the server
and then lifting it up.
Hard disk drive
backplane 1
SAS
signal
cable