On Dec 4, 2010, at 11:40 AM, [email protected] wrote:
No power-up light
Non fans
No chimes
No HD spin
The FIRST thing to check is the input power switch.
It has a 115 position and a 230 position.
If placed on the 230 position, but operated on 115 volts, the PSU's
"converter section" is operated as a full-wave bridge, and the
intermediate dc bus voltage will be only 162.25 volts, whereas it
needs to be 325 volts for proper operation.
If placed on the 115 position, and operated on 115 volts, the PSU's
"converter section" is operated as a half-wave voltage doubler, and
the intermediate dc voltage will be 325 volts, as is expected and
required for proper operation.
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