Reliant Octel 200 and Octel 300 Message Servers PB6001401 - Manual (Page 479)

Hardware Replacement 9-47
Octel Overture 200/300 Serenade 3.0 PB60014–01
Removing a Disk Drive Backplane from the Octel Overture 300
Use the following procedure to remove a disk-drive backplane:
1. Unlock and open the door of the cabinet.
2. Put on an antistatic wrist strap. Connect it to an unpainted portion of the cabinet.
3. Turn OFF the power supply unit. Refer to the Power Supply Unit Replacement section in this chapter
for details about turning OFF the power to the message server.
4. Using a flat-bladed screwdriver, loosen the two captive screws on the front of each of the disk-drive
assemblies on the shelf that has the faulty backplane. Disengage each disk-drive assembly from the
backplane; the disk-drive assembly should stay in the cabinet.
5. At the rear of the Octel Overture 300 cabinet, disconnect all cables attached to the motherboard.
Mark the cables so that they can be reattached at the same positions.
6. Disconnect the power cord from the cabinet.
7. Remove the four screws that secure the bottom panel to the cabinet, and remove the panel.
Cables that were disconnected from the motherboard in step 5 might be fastened to the bottom panel
with cable ties. These cables can remain fastened.
8. Disconnect all harnesses and cables from the backplane being replaced. Make sure that the ends of
the harnesses and cables not directly attached to the backplane being replaced remain connected.
9. If the shelf B disk-drive backplane is being removed, and the message server is equipped with a
load-resistor assembly, remove the four screws and washers that secure the load-resistor assembly to
the message server. Refer to Figure 9-28 to verify whether a load-resistor assembly is present.
10. Remove the screws along the top and bottom edges of the backplane and remove it.
Installing a Disk Drive Backplane in the Octel Overture 300
Use the following procedure to install a new disk-drive backplane:
Caution!
The backplane must be aligned precisely to ensure
that the disk-drive assembly is fully engaged with the
backplane. To accomplish this, follow the
instructions exactly.
1. Hold the new backplane up to the cabinet, and install a screw in the top, center screw hole to hold it
in place.
2. If the shelf B backplane is being installed in a message server with a load-resistor assembly, secure
the load-resistor assembly to the cabinet with four screws and washers, as shown in Figure 9-28 . Do
not tighten the screws.
3. Install all of the screws along the top and bottom edges of the backplane, so that it is just able to
move, with only a small gap between the screwheads and the backplane.
4. At the front of the cabinet, push each disk-drive assembly into its mating connector on the
backplane.
5. Tighten all the screws on the top and bottom edges of the backplane.