[rescue] Ultra 10

[Mike Free]

Amperage specifications are maximums, not requirements....essentially, the
U10 will allow the motherboard to "draw" 0.3A of -12.0 volts, while the ATX
will allow 0.5A. The motherboard will draw what it requires regardless of
the specification of the power supply, as long as the replacement amperage
spec is higher than the original.

The only number you should be worried about is the 21A 3.3V output on the
U10 versus the smaller 15A spec on the PC PS. If the ultra 10 motherboard
really requires that much current and exceeds 15A draw, it will damage the
new power supply.

Mike Free
----- Original Message -----
From: <s at avoidant.org>
To: <rescue at sunhelp.org>
Sent: Wednesday, August 15, 2001 11:45 PM
Subject: Re: [rescue] Ultra 10


> james at foonly.com wrote:
>
> > The p/s is standard ATX.  You may or may not find an identical form
factor
> > at the local computer store but a PC ATX p/s should work.
>
>
> It doesn't actually seem to be an ATX PS. I wish it were. All the
> connectors are the same, as are the voltages on them, but the amperages
> are completely different.
>
> Output        Voltage  U/10     ATX
>   1           +3.3      21A     15A
>   2           +5.0      22A     20A
>   3           +12.0     5.0A    8.0A
>   4           -12.0     0.3A    0.5A
>   5           -12.0     0.3A    0.5A
>   6 (Standby) +5.0      0.2A    0.8A
>
>
> Admittedly, they're not all that far off, and most are lower (does that
> mean I'd use less power? Would the machine run slower?), but that 0.8
> for the standby worries me a bit. Plus there's one connector missing on
> my ATX supply that's on the U/10 that plugs into the motherboard. I've
> seen the place for it on peecee mobos, but the ATX P/S in front of me
> doesn't have one. Is it important?
>
> If someone tells me this'll work, I'll put it in right now and be happy.
> Otherwise, I'v3 got someone looking at repairing the one that sparks.
> I've a feeling it's just a bad solder joint. It might have bounced
> around in the trunk of my car on the way home, and I've seen stranger
> things than a solder come loose and short.
>
>
> Thanks,
>
>
> ---sambo
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