Emax

Hi Folks,

Great news! Thanks to all the help from this group, I've got a fully functioning Emax again.

Also (kind of) good news for anyone not wanting to use an ATX PSU.

I tested it out first with an ATX that I salvaged from a scrapped PC. This worked fine, but it 
was going to be a bit of a messy solution, due to the size of the PSU and all the surplus 
cabling. Also, I just couldn't put up with that bloody noisy fan!

Next step was to shop around for a dedicated replacement power supply. With the help of 
an electrician neighbour, I tracked down one of the few that seems to be made at the 
moment with the necessary outputs.

So, if anyone else is interested here are the details:
It's an EOS VLT60-3000
I bought it from RS Components (http://rswww.com). Their stock number for it is 
377-6930. It's about one third of the size of the original supply so I mounted a piece of 
blank circuit-board fiberglass where the original supply went, and attached the new one to 
this using plastic stand-offs. The blank board and stand-offs were from Maplin's.

The only potential problem I had was finding a six-way molex plug to connect the output 
of the power supply to the cables that go to the Emax board. I had to canibalize an old 
scrapped AppleMac power supply for this. However, I'm sure this kind of plug is obtainable 
if you take the power supply to a computer repair shop.

Now for the bad news... The list price for this power supply is £46.25. However, by the 
time I'd added the postage and VAT it cost me £60. This is what I paid for the Emax!

Anyway, it was well worth it and I'm very happy with my new EMAX

Thanks again to everyone who helped me, and good luck to anyone else who needs a new 
power supply for their Emax.

Cheers,
Alan Currall

--- In emax@yahoogroups.com, "Dave Sotnick" <sotnickd@...> wrote:
>
> Ahhh, yes! I forgot to mention the GREEN wire (pin 16).
> 
> It is labeled as "Power Supply On (active low)." Short this pin to GND to
> switch power supply ON, disconnect from GND to switch OFF.
> 
> So, you'll want to connect the green to one of the black wires (i.e. pin 16
> to pin 17).
> 
> -Dave
> 
> On 10/19/07, Simon_Owen <iss049@...> wrote:
> >
> >   Hi There
> >
> > Well, i've tried installing an ATX PSU in my emax following the pinouts
> > listed, but still no
> > joy. The PSU doesn't actually want to power up. Could this be due to the
> > fact that some
> > ATX PSU's get their power-on message by the usual method of pressing the
> > "power on"
> > button the PC thereby triggering the power on the PSU ??? - I dunno,
> > anyone?
> >
> > Bloody thing!
> >
> > Simon
> >
> >
> > --- In emax@yahoogroups.com <emax%40yahoogroups.com>, Alan Currall
> > <alan@> wrote:
> > >
> > > 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]
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
> >  
> >
> 
> 
> [Non-text portions of this message have been removed]
>