Reliant Octel 200 and Octel 300 Message Servers PB6001401 - Manual (Page 469)

Hardware Replacement 9-37
Octel Overture 200/300 Serenade 3.0 PB60014–01
Caution!
Replacing the motherboard assembly is a
complicated procedure. Replace it only after you
have confirmed that the motherboard is faulty. Do
not disassemble the motherboard.
The motherboard can only be replaced as an assembly. To replace the motherboard assembly, you must
have access to both the front and rear of the Octel Overture 200/300 cabinet.
Removal and reinstallation procedures are separate for the Octel Overture 200 and Octel Overture 300,
because the procedures differ for each message server.
Caution!
Make sure to wear an an antistatic wrist strap before
attempting the following procedures.
Handle the motherboard assembly carefully; do not
drop it or bang it into other objects. Never set
anything on top of it.
Removing the Motherboard Assembly from the Octel Overture 200
To remove the motherboard assembly, use the following procedures:
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. Disengage the cards in slots A1 through A9 from the motherboard. (The cards stay in the cabinet.)
Remove the floppy-diskette signal cable.
5. Using a flat-bladed screwdriver, loosen the two captive screws on the front of the power supply unit
and on the disk-drive assembly. Disengage them from the backplane. (The power supply unit and the
disk-drive assembly stay in the cabinet.)
6. Move to the back of the Octel Overture 200 cabinet, and label all cables attached to the motherboard,
so that they can be reattached in the same positions on the new motherboard.
7. Disconnect the cables from the motherboard.
8. Unplug the AC cord from the cabinet.
If the cabinet is d.c. powered, disconnect the wiring from the d.c. power source at the DC inlet box.
Remove the DC inlet box from the back of the message server as shown in Figure 9-23.
9. Remove the fan panel, following the instructions in the Octel Overture 200 Fan Panel Assembly
section in this chapter.
10. Disconnect the maintenance-port cable from the upper left hand corner of the motherboard.
11. Using a Phillips head screwdriver, 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 7 are fastened to the bottom panel with
cable ties. These cables can remain fastened.