Emax

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
>
>  
>


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