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| Sun Fire X4470 Server ### Service Manual

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## 5.2 Servicing the Fan Board (FRU)

Use the following procedures to remove and install the fan board.

| Caution - These procedures require that you handle components that are sensitive to static discharge. This sensitivity can cause the component to fail. To avoid damage, ensure that you follow antistatic practices as described in 2.3 Performing Electrostatic Discharge and Static Prevention Measures.

## Remove the Fan Board

1. Prepare for servicing:
   1. Attach an antistatic wrist strap.

      See 2.3 Performing Electrostatic Discharge and Static Prevention Measures.

   2. Power off the server.

      See 2.6 Powering Off the Server.

   3. Extend the server to the maintenance position.

      See 2.4 Positioning the Server for Maintenance.

   4. Remove the top cover.

      See 2.7 Removing the Server Top Cover.

2. Remove all fan modules.

   See Remove a Fan Module.

3. Remove all memory risers.

   See Remove a Memory Riser and DIMM.

4. Disconnect any cables plugged into the USB or video connectors on the front of the server.
5. Remove the fan board (Removing the Fan Board):
   1. Loosen the three captive screws connecting the front memory riser guide to the motherboard.
   2. Remove the two screws on each side of the outside of the chassis that hold the fan board unit in place.
   3. Unplug the fan board cable and power cables from motherboard.
   4. Remove the front memory riser guide by pulling it up and out of the chassis.
   5. Pull the fan board back and out of chassis.

      Figure 5-4 Removing the Fan Board

## Install the Fan Board

1. Unpack the replacement fan board unit and place it on an antistatic mat.
2. Remove the fan board cable and power cables from the faulty fan board unit and plug them into the fan board on the replacement fan board unit.
3. Reinstall the fan board unit (Installing the Fan Board):
   1. Insert the fan board unit into the chassis, moving it down and toward the front.
   2. Reposition the front memory riser guide, routing the fan board and power cable through the riser guide.
   3. Plug the fan board cable and power cable into the connectors on the motherboard.
   4. Tighten the three captive screws to hold the front memory riser guide in place.
   5. Secure the fan board unit in place by reinserting and tightening the two screws on each side of the outside of the chassis.

      Figure 5-5 Installing the Fan Board

4. Reinstall all fan modules.

   See Install a Fan Module.

5. Reinstall all memory risers.

   See Install a Memory Riser Filler Panel.

6. Return the server to operation:
   1. Install the top cover.

      See 6.1 Replacing the Server Top Cover.

   2. Return the server to the normal rack position.

      See 6.2 Returning the Server to the Normal Rack Position.

   3. Power on the server.

      See 6.3 Powering On the Server.

   Note - The product serial number used for service entitlement and warranty coverage might need to be reprogrammed on the fan board by authorized service personnel with the correct product serial number located on the chassis EZ label.

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