9-52 Installationand Maintenance Volume
Octel 200/300 S.4.1 PB60019−01
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 cabinet.
.The Octel 200 and the Octel 300 motherboard removal and reinstallation procedures are
different for each model type Be sure to use the correct procedures.
Caution!
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.

Octel 200 Motherboard Assembly

The following procedures are for removing and installation an Octel 200 Motherboard Assembly. Refer to
the following illustrations while using these procedures
Figure 9-26 for the AC Backplane Power Harness
Figure 9-27 for the DC Backplane Power Harness

Removing the Octel 200 Motherboard Assembly

To remove the motherboard assembly,use the following procedures:
1. Unlock and open the cabinet door.
2. Put on an antistatic wrist strap. Connect it to an unpainted portion of the cabinet.
3. Turn OFF the PSU. Refer to the Power Supply Unit Replacement section in this chapter for details
about turning OFF the power.
4. Disconnect the floppy disk signal cable.
5. Disengage the cards in slots A1 through A9from the motherboard. (The cards stay in the cabinet.)
6. Use a flat-blade screwdriver to loosen the two captive screws on the front of the PSU and floppy disk
drive assembly. Disengage it from the backplane. (The PSU and the disk drive assemblies stay in the
cabinet.)
7. Move to the back of the Octel 200 cabinet. Label all cables attached to the motherboard assembly so
that they can be reattached in the same positions on the new motherboard assembly.
8. Disconnect the cables from the motherboard assembly.
9. Unplug the AC power cord from the cabinet.
If the cabinet is DC powered, disconnect the wiring from the DC power source at the DC inlet box.
Remove the DC inlet box from the back of the server as shownin Figure 9-27.