[rescue] Pinout for Cobalt/Sun Qube 3 Power Supply?

[Plamen Mihaylov]

Hi,

Let me check as I made few PSUs for cube3

On Friday, May 3, 2024, Alexander Jacocks via rescue <rescue at sunhelp.org>
wrote:

> All,
>
> I just picked up a fairly nice Cobalt Qube 3, but it did not come with a
> power supply. I beeped out the power connector (DIN-8) on the back of the
> chassis, knowing that it needs +12, +5, and -12 vdc, from the labeling on
> the chassis.
>
> Checking the continuity with the mosfets on the other side of the power
> connector, on the backplane, I found the following:
>
> Facing back of chassis
> power input connector (DIN8 female)
>
>   6   7
>  1  8  3
>   4   5
>     2
>
> 1 probably +5vdc 4430 mosfet (middle) pins 5-8 (drain)
> 2 “
> 3 “
> 4 gnd
> 5 gnd
> 6 -12vdc 4435 mosfet (right) pins1-3 (source)
> 7 gnd
> 8 probably +12vdc 6690 mosfet (left) pins1-3 (source)
> shield gnd
>
> I looked up those parts, and the 4435 mosfet specifies negative voltage,
> so I assumed that would be -12vdc. The 3 wires is clearly +5vdc, since the
> machine says that it needs +5 at 8a. -12 at 0.5a and +12 at 1.5a are the other
> voltages, I believe.
>
> Does anyone have a working PSU that they can verify this with?
>
> I made up a power supply and cable using a Mean Well RT85B supply and some
> good quality silicone jacketed wire. I verified that nothing unexpected is
> shorted. The PSU powers up fine, without the machine attached, and all the
> voltages are correct. However, if I plug in the DIN8 cable, the PSU shuts
> down, clearly shorted.
>
> Any help would be appreciated.
>
> - Alex
>
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