[ale] Sun Ultra 40 / apcupsd / buzz-saw sound from powersupply.

[George Allen]

On Thu, May 5, 2011 at 11:09 PM, Jeff Hubbs <jhubbslist at att.net> wrote:
> Does the pitch of the sound fall when you pull a cable?  I've had to
> replace a bad fan in a SunFire V240 PS before...

No - it's a relay-buzz sound rather than a fan-buzz sound. It only
happens when the unit is NOT powered on, and it's plugged into the
UPS. Maybe the UPS is putting out more of a saw-tooth than sine-wave
AC? Powering the computer on stops the sound instantly. When it's
happening, the only thing that changes the pitch (to zero) is pulling
the power plug from the unit. :)

>
> On 5/5/11 11:03 PM, George Allen wrote:
>> I'm now the proud owner of a Sun Ultra 40 (Dual Opteron) that I got
>> cheap off EBay. It's a little dated, but I like it, and the case is
>> awesome.
>>
>> We have lots of brownouts and power outages with the weather (sharing
>> an old house) so I bought a UPS to condition the power and let it do
>> graceful shutdowns. apcupsd works, it shuts itself down on battery
>> power, BUT - once shut down, there is this BUZZ SAW sound from the
>> power supply, like a relay or something that won't kick off while the
>> UPS is still feeding it power. Pulling the plug from the Sun itself
>> was my remedy the past couple of time... although if you turn the
>> computer back on, it's fine -- the buzz saw-stops, regardless of
>> whether your on AC or battery.
>>
>> I haven't tried it enough times to determine what the 'criteria' are -
>> whether it's on/off-battery, what mode the UPS is in, etc... because I
>> want to avoid my power supply screaming at me as much as possible.
>>
>> So, has anyone heard of this before?
>>
>> --George
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>
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