Warning

Read completely the instructions detailed in Preliminary Service Information.

Although some of the board is hidden behind the cooling fan assembly, all of the fixing screws and cable connections are easily accessible.

System management controller (SMC)

Removing

Take careful note of where each connection is from and unplug three ribbon cable connectors, the power connector, three fan connectors, two thermistor connectors and one keylock sensor cable connector as shown in the following diagram:

1 Power Connector 2 Fan Connectors 3 Thermistor Connectors 4 Keylock Sensor Connector 5 Securing Screws 6 Ribbon Cable Connectors

Remove the two screw lock posts on the 25-way SMC serial port connector which is visible on the server’s back panel:

1 Screw Lock Posts 2 Back panel

3. Remove the seven fastening screws and lift the board out of the machine.

Fitting

1. Feed the 25-way serial port connector through the opening in the back panel.

2. Fasten the board to the centre spine using the seven screws as previously removed

3. Fasten the two screwlock posts into place at both ends of the 25-way connector on the back panel.

4. Plug the ribbon cables, power cable, fan and associated thermistor cables and the keylock sensor cable into their respective connectors on the SMC board as shown in the previous diagram. Ensure the ribbon to the front panel is returned to the top left connection.

Caution

Ensure the ribbon cables from the front panel and the PSU are in their correct positions or damage will be caused to the SMC board.

Against each fan connector on the board there is a graphic which indicates which fan cable should be plugged in:

The middle and bottom fans in this series are located below the SMC board in the disk subsystem area.

System Controller Cooling Fan Assembly

Removing

1. Unplug the top fan connector on the SMC board (see fan connector graphic in "System Management Controller Board, Fitting").

Remove the two securing screws for the fan assembly, found on the back panel as shown:

1 Securing Screws 2 Back panel

Tilt the top of the assembly slightly towards the interior of the server (if it hasn’t already) and lift it upwards to free it from the chassis

1 Tab Slots 2 Metal Tabs

Fitting

1. Fit the assembly so that the two metal tabs at the bottom are inserted into corresponding slots. The assembly will then have a natural tilt towards the interior of the server.

2. On each side of the assembly there is also a smaller tab which fits into a corresponding slot in the chassis. Squeeze the sides gently until the tabs fit into the slots.

3. While holding the assembly in place, fasten it with the two screws on the back panel of the server.

4. Connect the fan cable to the top connector on the controller board.

Against each fan connector on the board there is a graphic which indicates which fan cable should be plugged in:

For further information about dismantling the fan sub-assembly, see the following chapter, which provides detailed instruction on the rest of the internal system fans.