HardwareReplacement 9-53
Octel 200/300 S.4.1PB60019−01
10. Remove the fan panel following the instructions in the Octel 200 Fan Panel Assembly section in this
chapter.
11. Disconnect the maintenance port cable from the upper left hand corner of the motherboard.
12. Use a Phillips screwdriver to remove the four screws that secure the bottom rear panel to the cabinet and
slowly remove the panel.
.Cables that were disconnected from the motherboard in Step 8 are fastened to the bottom panel
with cable ties. These cables can remain fastened.
13. Remove the six screws that secure the motherboard to the cabinet from the sides of the motherboard
I/O panel.
14. Remove the motherboard.
15. Refer to Figure 9-26 for AC or Figure 9-27 for DC 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 the Octel 200 Motherboard Assembly

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 9-26 for AC or Figure 9-27 for DC, 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 loosely install a screw in the top, center screwhole
to hold it in place.
4. Partially screw in the remaining 17 screws along the top and bottom of the motherboard. Do not
tighten the screws yet.
5. Install the six screws on the sides of the motherboard I/O panel, but do nottighten them at this time.
6. Push only PCAs in slots A1and 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 screws at the top and bottom of the motherboard and the six screws onthe 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, twolong ones at the
bottom).