4. To remove the air baffle near the center of the server, complete these steps:Baffle pinsAir baffleCable routing slotBaffle mountingholesa. Slide the baffle back from the front of the server to disengage the tab at thefront of the baffle from the bulkhead that runs the width of the server.b. Lift the baffle up slightly, making sure that the pins come out of the holes onthe system board.c. Slide the cables out of the cable routing slot. Make sure you do notdisconnect or loosen the cables.d. Lift the baffle out completely.Attention: For proper cooling and airflow, replace the air baffle before you turn onthe server. Operating the server with the air baffle removed might damage servercomponents.Installing a hot-swap power supplyThe following notes describe the type of power supply that the server supports andother information that you must consider when installing a power supply:v The server comes with one 670-watt hot-swap 12-volt output power supply. Theinput voltage is 110 V ac or 220 V ac auto-sensing.v You can install an optional 670-watt hot-swap 12-volt output power supply to useas a redundant power supply.v These power supplies are designed for parallel operation. In the event of apower-supply failure, the redundant power supply continues to power the system.The server supports a maximum of two power supplies.Note: If you are using a Y power cable between two servers that act as backuppower units, see “Installing a Y power cable” on page 30 for informationabout how to connect a Y power cable.28 IBM System x3550 Type 7978: User’s Guide
