Lenovo ThinkSystem SR650 V2 Maintenance Manual page 302

Step 1. If a cable management arm (CMA) is installed, adjust the CMA to gain access to the power supply
bay.
a. Press down the stop bracket
b. Rotate the CMA out of the way to gain access to the power supply.
Note: Your CMA kit might look different from the illustration.
Figure 216. CMA adjustment
Step 2. Disconnect the power cord from the hot-swap power supply and the electrical outlet.
• For AC power input, disconnect both ends of the power cord and keep it in an ESD-safe place.
• For –48V DC power input:
1. Disconnect the power cords from the electrical outlet.
2. Use a slotted screwdriver to loosen the captive screws on the power supply terminal block.
3. Disconnect the power cords from the power supply unit, make the wire terminal insulated,
and keep them in an ESD-safe place.
Note: If you are replacing two power supplies, replace them one by one to ensure that the power
supply to the server is not interrupted. Do not disconnect the power cord from the secondly
replaced power supply until the power output LED for the firstly replaced power supply is lit. For the
location of the power output LED, refer to "Rear view LEDs" on page 52.
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and rotate it to the open position.
1