9-44 Installationand Maintenance Volume
Octel 200/300 S.4.1 PB60019−01
AC-to-DC Power Supply Conversion
Before proceeding, read the instructions in the Installing the Octel 200/300 with a −48 VDC Power
Supply Unit section, in the Installation chapter of this volume. Make sure that the material is available to
connect the cabinet to the −48 VDC power source.
The Octel 200/300 can be powered by either an AC or DC power source.
The Octel 200 contains either an AC or DC version of the PSU to work with the power source selected.
The DC version requires an additional DC inlet box. To convert the Octel 200 from an AC-powered to a
DC-powered message server, use the Octel 200 instructions.
The Octel 300 contains either an AC or DC version of the PSU and power filter assembly to work with
the power source selected. To convert the Octel 300 from an AC-powered to a DC-powered message
server, use the Octel 300 instructions.
Caution!
Damage to the message server might occur if
replacement procedures are not performed in the
order given.

Removing the Octel 200 AC Subassemblies

This conversion requires the Octel 200 AC-to-DC power supply conversion kit, part number
740-6543-001, which contains the following:
-DC PSU
-DC inlet box
-DC backplane harness
To remove the ACsubassemblies, use the following procedures:
1. Remove the AC PSU, following the instructions in the Removing the Power Supply section in this
chapter.
2. Remove the VCU and CPU cards from slots A8 and A9, respectively.
3. Discard the spare fuse attached to the side of the cabinet, located under the PSU.
4. Disconnect the power cord at both ends, and set it aside.
5. Remove the fan-panel assembly as described in the Removing the Fan Panel from the Octel 200
section.
6. Remove the AC backplane harness by removing the two screws that hold the connector in the
backplane, as shown in Figure 9-26. These screws can be accessed through the front of the cabinet.
Remove the hardware that secures the ground wires and the connector from the I/O panel. Pull the
harness out of the message server.