3. Remove the server from the rack and remove the cover (see “Removing thecover” on page 68).Attention: To ensure proper cooling and airflow, do not operate the serverfor more than 2 minutes with the cover removed.4. Rotate (lift) the air deflector out of the way.5. If the server is a 3.5-inch drive model, remove the hard disk drive back plate orbackplane (see “Removing the backplane or back plate (3.5-inch drives)” onpage 89).6. Disconnect the power-supply cables from the connector on the system boardand from all devices; then, disengage the cables from any retention-clips thatsecure them to the chassis.Note: Note the routing of all power-supply cables; you will route thepower-supply cables the same way when you install the power supply.7. Remove the rear screw, which holds the power supply to the rear of thechassis.8. Loosen the captive thumbscrew at the rear of the power supply that securesthe power supply to the chassis bottom.9. Lift the power supply out of the bay.10. If you are instructed to return the power supply, follow all packaginginstructions, and use any packaging materials for shipping that are supplied toyou.Installing the power supplyTo install the replacement power supply, complete the following steps:1. Read the safety information in “Working inside the server with the power on”on page 66.2. Place the new power supply into the bay.3. Tighten the captive thumbscrew at the rear of the power supply to secure thepower supply to the chassis bottom.4. Replace the rear screw, which holds the power supply to the rear of thechassis (see the illustration on page 85).5. Make sure that the air deflector is in the open position.6. Connect the internal power-supply cable from the power supply to the powerconnector (CN20) on the system board (see “System-board internalconnectors” on page 6).7. Route the other internal power-supply cable, securing it under theretention-clips on the chassis; then, reconnect the cable to the CD/DVDinterface card.86 IBM System x3250 Types 4364 and 4365: Problem Determination and Service Guide
