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:
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@8a. -12@0.5a and +12@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
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:
Code:
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 gndI 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@8a. -12@0.5a and +12@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
