Digi 002 Power Supply Molex Pinout Voltages

[frets70]

**WARNING DO NOT ATTEMPT ANYTHING IN THE POST UNLESS YOU ARE PROPERLY TRAINED, I AM NOT RESPONSIBLE FOR INJURY, HIGH VOLTAGES INSIDE DIGI 002***

OK, I will try to be brief and focused.

I acquired a Digi 002 in a mess of a gear trade, previous owner said the mute light comes on, stays on and doesn't communicate with computer.

Ok, I though probably the 'ole wiring harness issue.

Brought it home turned it on, mute light came on flickering, then I smelled smoke, I shut it off.

Opened it up, turned it on again, and saw smoke coming from the top right corner of Power Supply---called Uni-Power a new PS is $199---no can do
Also I measured the molex connectors with a Volt meter and got NO voltage on any pins.

Weird because it is supposed to be +3vdc, +5vdc, +12vdc, and -12vdc (according to the spec sticker on PS) very typical computer PS voltages

fast forward to today......

I opened chassis again powered up the unit, and let it start smoking good, then shut it down and confirmed that a transistor by the little blue Voltage trimpot was over heating, I pulled it off the circuit board.

It was melting off the solder pads, I am assuming it is a voltage regulator, (I may also replace and see what happens).

Then thought lets turn it on again and see what else smokes up---nothing did.

I measured the PS Molex pins with a meter again and bingo I have voltage.
double weird. I did all the testing with no circuit board wiring harness connected for safety.

with all correct voltages present(or so it seemed), I hooked up harness and powered unit up.

It powered up and didn't blow up, so I started metering the unit voltages live.

**AGAIN DONT METER IN A LIVE UNIT UNLESS YOU KNOW WHAT YOU ARE DOING!**

after testing I noticed that the 3.3 volt line was only reading 3.1 so I turned the trimpot and increased the voltage to 3.3.

Bam!! 3 relay clicks, the SRC light comes on and the unit is functioning under power and all seems normal.

Still no firewire with computer, although I have a green firewire light on back of Digi---maybe a burned out firewire chip, IDK different issue to start on


My question, does anybody know if these voltages are correct for the wiring harness?-- I may end up doing a custom power supply

Black-- Ground
Blue- +3 vdc
Red- +5 vdc
white- +12 vdc
yellow- -12 vdc

[BadSector]

I am having the exact same behavior issue with my 002, minus the smoking. First thing I did was check continuity across every connection point of the 4-part power cable - everything was good. Next, I visually inspected the power supply components and didn't see any obvious blown caps or anything else. Now I'm going to check the things you did and see what happens...

[BadSector]

I finally got around to checking the PSU voltages. Here's what I got initially:

Blue: +2.67 vdc
Red: +4.22 vdc
Black: Ground
White: +10.2 vdc
Yellow: 10.1 vdc


After I dug out the green crap they put in the voltage regulator screw (presumably to tell me, "Don't fix this yourself because we want your money"), I was able to get some decent voltage flowing through the circuit. I ended up with:

Black: Ground
Blue: +3.06 vdc
Red: +5.1 vdc
White: -12.5 vdc
Yellow: +12.4 vdc

I shut it down, reconnected the power harness cable to the PSU, flipped it over, powered it up, and... it works. I've tested it with a few sessions and it seems to behave properly... for now!

Thanks for your advice, frets70!