One step forward, one BIG step back.
I neglected to check my work, bought a new, strong power supply…and supplied the wrong voltage to the RUMBA, which did a good job of approximating an incense burner.
Also note how the trace did a pretty good approximation of a fuse, while the poly fuses did a pretty good approximation of…well…not fuses, that’s for sure.
Good thing these are reasonably cheap. I guess.
ouch
It’s nice having the schematics. I’ll try bypassing the burnt traces…then order another board. 
it’s not like it’ll get any more broke.
It might be repairable. I hope the stepper drivers are OK, at least.
Sigh…no joy. Off to reprapdiscount I go…
was there a pop? or just glowing traces?
Pop, and smoke. The high power side of the board is toast. The arguing still powers up and drives the LED from USB power.
<3 @Kyle_Wade , I still got a lot to learn from him. Give that bastard pretty much any PCB, and in 5 minutes he’ll have the damn thing figured out and hooked up to a microcontroller and outputting stuff. Or up to an oscilloscope and tell you how it’s supposed to be fixed. >_>
Arguing? damnphone…that was supposed to say ‘Arduino still powers up’…
I’m on my second replacement rumba, the previous 2 had trace issues (1 short and one bad trace) . They do seem to have a high fault ratio so it may be worth confirming if you did anything that voided the warranty. They are supposed to be good up to 24V so you must have had a real beefy power supply. What voltage was it set to?
That’s the thing. I bought a new 600w ATX supply, and used the 5v lead off one of the Molex’s instead of the 12v…polarity was correct, I can only assume it cranked a whole lot of amperage through things.
Ah, yeah. That would do it.
You play banjo?
Learning Uke while the boys learn acoustic and violin respectively.
Wait… You put LESS voltage than the board called for?
That should not have caused any damage.
Yeah, no. Using a 5V supply should never do that. That’s a warranty issue.
Aside from damaging motors, here’s the best result I found from a quick Google search
I’ll contact reprapdiscount, but this is honestly something WAY beyond my EE skills. I have learned that the potential draw is seriously important, and…my EE knowledge is less than perfect. It’s one of the reasons I waited this long to get into 3d printing, knowing that a big part of it is little more than black magic to me.
It’s also a circuit that drives a GREAT BIG HEATER. If the only device being powered by the 600 watt power supply is over a 5v circuit, it could potentially say ‘okay, drink 5v from the firehose.’ I dunno, it’s not part of my skillset.
Certain loads could do that, but not a resistive heater. Which trace is it that’s lifted off? Is that input or output?
hmm odd. fuses work on the current not voltage, so if you overvoltaged I could see that happening and the fuses not triggering. if you udnervolted and the amps did go up, the fuses would have triggered.
very odd.
