HELP - I just fried a 7i76ED

Hi Guys,

I think I have just fried my 7i76ED.

I am still in the wiring / setup stage, and was just wiring up the Z limit switches.

I powered the board up, and it started smoking. I powered down ASAP, but looks like I have done some permanent damage.

Looks like a couple of ICs have burn marks, but I'm not sure what they are. They apear to be labelled U24 and U19.

I am still not 100% sure where the short was. The only difference from last working was I had wired Z limit switches - 1 wire to input and the other to field power.

The only other possibility is that the shielding on 1 of my cables accidentally touched the board and shorted everything out.

Does anyone in AUSTRALIA have a 7i76ED or 7i76ED board I could buy off them ASAP?

Thanks

I have one in Brisbane but its not a D.

Looks like some high voltage wire or something touched and shorted to the screw for TB2-pin6. (That or you really made hamburger out of it with a screwdriver.)

Yeah it looks like a high voltage (well 12V or more) got connected to the
7I76Es 5V rail

I have one in Brisbane but its not a D.

Thanks rodw, I found one in WA yesterday, and it is on Startrack, so hopefully should have it by the end of the week

Yeah it looks like a high voltage (well 12V or more) got connected to the
7I76Es 5V rail

Looks like some high voltage wire or something touched and shorted to the screw for TB2-pin6

I hadn't noticed the mark on TB2-6. I just had a look at it, and it is only the top of the screw that is discoloured. Underneath looks brand new.

The only wiring change I had made was wiring in Z limit switches. These are an NC microswitch. I had them wired from 24V to TB6-14 and TB6-15. Should I have had them wired to 5V instead of 24V?

The other possibility is that the shield cable from one of my cables shorted out some pins on an IC - I will be insulating the ends of all cables before plugging the new board back in.

Thanks

htdave wrote:

I have one in Brisbane but its not a D.

Thanks rodw, I found one in WA yesterday, and it is on Startrack, so hopefully should have it by the end of the week

Was that from a distributor? I did not know we had any in .AU Please let us know.
Startrack express satchels are usually overnight ex WA to the eastern states.

Was that from a distributor? I did not know we had any in .AU Please let us know.
Startrack express satchels are usually overnight ex WA to the eastern states.

No distributor. I found a lcnc user on facebook that had a spare board that I can have until I get a new one.

I was going to order a couple more off Mesa US, but he only had one in stock, so have ordered one for now.

I'm in Rural NSW, so overnight normally means sometime in the next 2-3 days

htdave wrote:

I'm in Rural NSW, so overnight normally means sometime in the next 2-3 days

I know the feeling. I grew up in Western Queensland where we had one mail a week!