Step 1. If the server is in a rack, adjust the cable management arm (CMA) to gain access to the power
supply bay.
Figure 62. CMA adjustment
1. Press down the stop bracket
1 and rotate it to the open position.
2. Rotate the CMA out of the way to gain access to the power supply.
Step 2. Disconnect the power cord from the hot-swap power supply.
• For 240 V DC power supply units, turn off the server, and then, disconnect both ends of the
power cord and keep it in an ESD-safe place.
• For AC power supply units, disconnect both ends of the power cord and keep it 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
“Power supply LEDs” on page 195.
98
ThinkSystem SR645 V3 User Guide
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