Dell PowerEdge Rack Enclosure 4820 - Manual (Page 9)

Cable Routing Procedures for Dell PowerEdge R720/R720xd Systems
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4. Disengage the strain relief and disconnect the power cord from the power supply.
5. Disconnect both CMA attachment housings from the brackets on the rails as shown in Figure 7.
6. Detach the inner CMA bracket from the rail by pushing on the end of the lock spring and lifting the
bracket up and to the left until it clears the standoffs on the rail.
7. While supporting the CMA with one hand, remove and replace the outer power supply with the
other hand as shown in Figure 8.
8. Reinstall the inner CMA bracket to the rail and reconnect the CMA to the brackets.
9. Plug in the power cord, re-engage the strain relief, replace the CMA support tray, and return the
CMA to the closed (retracted) position.
Disconnecting the CMA attachment housings Figure 7.
Replacing the outer power supply Figure 8.