Lenovo System x3550 M5 Installation And Service Manual page 156

Step 5. Lift the air duct and disconnect the Mini-SAS HD (12Gb) and power cables from the rear hot-swap
backplane.
Figure 62. Mini-SAS HD (12Gb) and power cable connector location on backplane
Step 6. Loosen the screw located at the rear of the chassis.
Figure 63. Screw location
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Lenovo System x3550 M5 Installation and Service Guide
Power connector
Mini-SAS HD
(12Gb) connector