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#1 2015-02-07 23:11:05

bbraun
Member
Registered: 2014-05-29
Posts: 1,064
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Marathon iRack power supply pinouts?

I recently came across a Marathon iRack, but it was missing its power supply.

The iRack allows transplanting of a pre-DV G3 iMac into a 1U rack mountable enclosure.  It seems to take a male DIN 8 power supply connector, which then goes to its own power distribution board, which eventually winds back to the iMac's logic board.
I think I have traced out the distribution board to reverse engineer the pinout, but if anyone actually has one of these things, it'd be great to get confirmation before I zap something.
If the female connector on the back of the iRack is:

   6    7
 1    8   3
   4    5
      2

Then I believe the meanings are:
1,2,3 5V
4,5,7 Ground
8 -12V
1 12V

I plan on making a cable from this to an ATX PSU to hopefully power the thing.

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#2 2015-02-12 18:00:04

bbraun
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Registered: 2014-05-29
Posts: 1,064
Website

Re: Marathon iRack power supply pinouts?

I made a mistake when transcribing the pinouts.
Pin 6 in that diagram was intended to be 12V, not pin 1.

But it doesn't matter, it didn't work.  Fortunately no magic smoke escaped, but my reverse engineering of the power supply appears incorrect.  I'll have to schedule some more time to tear it all apart and look at this again.

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#3 2015-02-21 01:15:11

bbraun
Member
Registered: 2014-05-29
Posts: 1,064
Website

Re: Marathon iRack power supply pinouts?

I took the thing all apart again and double checked everything.  It all checked out.  So after messing with it forever, it turned out I needed to press the cuda reset button.  sigh.  Anyway, the pinout above turns out to be correct!  I just used an ATX extension cable and cut out the 12V, 5V, -12V, and ground wires I needed, soldered those to a DIN8 connector, and connected the power on line to ground, and away I go.

I threw an old bondi blue imac into the case, which included removing the speakers (they get put into the irack case), cdrom drive, hdd, and of course logic board.  It seems to be working ok now.

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