[iyonix-support] Re: Iyonix hanging (was Re: EtherK not starting up reliably)

Hi Steve

lots of detail, and thanks for this.

it does however miss the point:

a correctly working iyonix power supply puts out the aforesaid 5.06v +/- 
a couple of digits on the 5 v rail throughout its correctly functioning 
life on most any load placed on it by the iyonix.

there is a very high correlation with a lower voltage from THIS supply 
and mobo misbehaviour.  i.e. once THIS supply stops behaving in its 
*characteristic* manner then it is time to change it.. or at least 
replace  the relevant electrolytics within it that have dried out. (and 
I suspect you know more about this side of things than I do anyway)

hope this helps

John

Steve Fryatt wrote:
> On 24 Aug, Peter Bell wrote in message
>   <f213655b4e.peter@xxxxxxxxxxxxxxxxxxxxxxxxx>:
> 
>> A panic buy at Maplin produced a 250W ATX unit at =A318.98 (WF87U) -
>> 'white-box', and not even described as low-noise, but it does have a
>> variable speed fan, and seems quiet enough.  The Iyo has been running
>> for two hours without any obvious problems.  However, the 5V rail is
>> measuring 5.15V!
> 
> Even allowing for the calibration (or otherwise) of people's DVMs, the
> kind of voltage tolerances being thrown about on this list are utterly
> meaningless in the context of ATX power supplies.
> 
> Unless the standard spec has changed significantly since I stopped
> designing the things three years ago, the 5V rail is usually given as
> 4.75V to 5.25V.  The nominal often sits a little high of centre (say about
> 5.1V), due to the realities of transformer design, but even this isn't
> guaranteed.
> 
> Exactly where any given PSU will operate under the 'standard' Iyonix load
> is impossible to say, but it could fall anywhere within 0.25V either way
> of 5V and still be within spec.  The exact voltage at any time will depend
> on the loadings of most of the PSUs other outputs when the measurement is
> taken (and hence on hard disc activity, whether the CD is in use for
> reading or burning, etc), not to mention component tolerances in the PSU.
> 

-- 
John Ballance
jwb@xxxxxxxxxx
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