[CUBE] Sonnet Encore processor upgrade

[Tom Davidson]

Line voltage should have no effect on the internal power supplies in the 
Cube.
The External Brick takes the mains AC power and converts it to a regulated
28V at 8.125Amps This is supplied to the Cube internal power supplies 
via the
4 pin round connector plug on the bottom of the Cube.

If your DC-DC board fried, it's probably as a result of the extra load 
of the Sonnet
CPU board on the 5V supply. The Cube's DCDC board runs close to it's output
current capability when the CPU is upgraded. If it overheats, the FET's 
on the
DCDC board will burn out. This can cause what is known as a cascade failure
as the 28V external supply is run to all the parts of the cube that 
normally get 5V.
If this happens, then nearly every electronic part inside the cube is 
damaged.