HP A4500A - VMEbus Single Board Computer 744 Motherboard Hardware Manual page 187

DC-DC Converter Removal
DC-DC Converter boards and slave boards are required to power each CPU.
Each CPU requires a DC-DC Converter and slave(s) to operate. When upgrades are performed
NOTE
on the CPU, change the accompanying DC-DC Converter and slave(s) also. When returning
replaced CPUs, return the accompanying DC-DC Converter and slave(s) also.
The converter boards stand on edge in slots and are located immediately behind the Power Supply on the left
and right sides of the System Board, next to the CPU assemblies.
CAUTION DC-DC converter boards are not "hot-swap" or "hot-plug" units. Shut the server down and
unplug the electrical connection prior to removing or replacing DC-DC converter boards.
To remove a DC-DC Converter board and its slave(s) from the server, perform the following steps:
Step 1. Gently pull the left and right levers away from each side of the board approximately 0.635 cm (1/4
in.).
CAUTION
Step 2. Grasp the board by the left and right edges.
Step 3. With a gentle rocking motion, pull the board up and out of its slot.
Step 4. Place the board on a clean, static-free surface.
CAUTION There is little working room between the DC-DC converter boards and slave(s) and CPU-1. If
necessary, use a flat-blade screw driver to reach and release the levers prior to removing these
boards.
The following graphic shows the location of the DC-DC converter boards and slaves.
Chapter
CPU MHz
440
550*
* When available
DO NOT press hard on the left/right levers or they will break. The levers do not
extract the board from its socket. They provide vertical stability, only.
Master Slave
1 1
1 2
DC-DC Converter Removal
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