Reliant Octel 200 and Octel 300 Message Servers PB6001401 - Manual (Page 470)

9-38 Installation and Maintenance Volume
Octel Overture 200/300 Serenade 3.0 PB60014–01
12. Remove the six screws that secure the motherboard to the cabinet from the sides of the motherboard
I/O panel.
13. Remove the 18 screws that secure the motherboard to the cabinet; remove the motherboard.
14. Refer to Figure 9-22 or Figure 9-23 and remove the hardware that secures the backplane power
harness to the motherboard. Use an 11/32 nut driver to remove the grounding hardware. Remove the
backplane power harness from the motherboard, so that it can be reinstalled on the new motherboard.
.
The hardware used to secure the backplane power harness to the motherboard is reused when
securing the harness to the new motherboard.
Installing a Motherboard Assembly in the Octel Overture 200
To install the motherboard, use the following procedure:
Caution!
The motherboard must be aligned precisely to ensure
correct card engagement. To accomplish this, make
sure to follow the instructions exactly.
1. Install the backplane power harness from the old motherboard on the new motherboard. Refer to
Figure 9-22 or Figure 9-23 for correct installation.
2. Remove the Option Control Chip (OCC) from the old motherboard and install it in the new
motherboard assembly. Refer to the Option Control Chip Replacement section in this chapter for
removal and installation procedures.
3. Hold the new motherboard up to the cabinet, and install a screw in the top, center screwhole to hold
it in place.
4. Install the remaining 17 screws along the top and bottom of the motherboard, so that the it is just
able to move, with a minimal amount of distance between the screwheads and motherboard. Do not
tighten the screws yet.
5. Install the six screws on the sides of the motherboard I/O panel, but do not tighten them at this time.
6. Push only PCAs in slots A1 and A9, the power supply assembly, and one disk-drive assembly into
the connectors on the motherboard. Do not tighten the power supply assembly.
7. Tighten the 18 screws at the top and bottom of the motherboard and the six screws on the I/O panel.
8. Connect the maintenance port cable to the connector on the top left corner of the motherboard.
9. Fasten the bottom rear panel with four screws (two short ones at the top, two long ones at the
bottom), and reconnect the cables as they were connected on the old motherboard.
10. Replace the fan panel, following the instructions in the Octel Overture 200 Fan Panel Assembly
section in this chapter.
If the cabinet is d.c. powered, install the DC inlet box.
11. Verify that the power supply unit is OFF. Attach the power cord.
If the cabinet is d.c. powered, reconnect the wires from the d.c. power source to the DC inlet box.
Refer to Figure 9-23.
12. Plug the remaining boards into the motherboard.