Emax

Dave,

Thank you so much. That is so clear and thorough. You've filled in  
all the gaps left by the other descriptions of using an ATX on this  
message board. I realise that people are probably just trying to  
deter 'have-a-go amateurs' like me from doing it themselves and  
getting an electric shock, but a lot of the previous advice on this  
subject seems to expect a general grounding in electronics (no pun  
intended).

I'll let you know how I get on. (If I survive!)
Alan

On 13 Oct 2007, at 5:44AM, Dave Sotnick wrote:

> I just got out my multimeter and figured out the voltages of the  
> existing
> wiring from my working Emax I power supply. It is as follows:
>
> Green: Ground/Earth (0v)
> Purple: -12v DC
> Orange: +12v DC
> Yellow: +5v DC
>
> The three sets of four wires as above each carry the same voltages,  
> but
> presumably have different current requirements.
>
> The ATX power supply pinouts for a 24-pin ATX power supply (from here:
> http://en.wikipedia.org/wiki/ATX) show the following mapping should  
> work:
>
> ATX Connector Emax Connector
> ----------------------------------------
> Pin 3 (black) Pin 2 (green)
> Pin 4 (red) Pin 1 (yellow)
> Pin 10 (yellow) Pin 3 (orange)
> Pin 14 (blue) Pin 4 (purple)
> Pin 5 (black) Pin 7 (green)
> Pin 6 (red) Pin 6 (yellow)
> Pin 11 (yellow) Pin 8 (orange)
> Pin 14 (blue) Pin 9 (purple)
> Pin 7 (black) Pin 12 (green)
> Pin 21 (red) Pin 11 (yellow)
> Pin 11 (yellow) Pin 13 (orange)
> Pin 14 (blue) Pin 14 (purple)
>
> Note that the -12v supply (pin 14/blue) is bridged to three purple  
> wires on
> the Emax wiring harness, and the +12v supply (available on pins  
> 10/11 on
> ATX24) is shared from pin 11 to pins 8 and 13 of (orange) on the  
> Emax wiring
> harness.
>
> Before you plug anything in, make sure you have the right voltages  
> on the
> connector that goes onto the Emax I mainboard:
>
> 1: yellow (+5v)
> 2: green (COM)
> 3: orange (+12v)
> 4: purple (-12v)
> 5: n/c
> 6: yellow (+5v)
> 7: green (COM)
> 8: orange (+12v)
> 9: purple (-12v)
> 10: n/c
> 11: yellow (5v)
> 12: green (COM)
> 13: orange (+12v)
> 14: purple (-12v)
>
> Hope that helps!
>
> -Dave
>
> On 10/10/07, alancurrall <alan@...> wrote:
> >
> > I've got an atx power supply waiting to go into my Emax 1 SE Rack,
> > since the original PSU went bang. I know there are helpful Emax  
> users
> > out there who've replaced their power supplies in this way and claim
> > it's a relatively simple fix. However, I don't have a clue as  
> regards
> > the wiring. The multi-cable coming from the ATX has different  
> coloured
> > wires than the multi-cable that connects to the Emax circuit- 
> board, so
> > it's not a smiple matter of matching them up.
> >
> > Can anyone put me right? I only had this wonderful machine a week
> > before the power went. I've heard what it's capable of, but now I  
> left
> > with a very sad, mute metal box.
> >
> > Here's hoping...
> > Alan
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
>
> 



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