RUMBA board shorting out

[Chadd]

I print everything on my 12" with Rumba board from the PC through a direct connect USB. Double check all your connections and wiring I am guessing you have a wiring issue. Either that or there is something up with the USB hub or a device plugged into it may be back feeding power somehow?

[stridera]

I'm using this power supply: http://amzn.com/B00D7CWSCG

It's set to exactly 12v based on my fluke multimeter.

[Chadd]

I'm using this power supply: http://amzn.com/B00D7CWSCG

It's set to exactly 12v based on my fluke multimeter.

That is the same power supply I use.

[tsteever]

Ditto. I may have missed it, but have you tried just plugging in the board straight to the computer? No USB hub? Or, do we need to wait for a new board to arrive cause you have nothing to test it with?

[printbus]

What are you using to power the hub? Before hooking another RUMBA up to the hub, I'd use a multimeter to measure the voltage coming out of the hub power supply with it unplugged from the hub. Maybe it's outputting more than it should when there aren't many things connected to the hub. If you read more than say 5.25V, you're pressing your luck with anything connected to it, even if some devices seem to be able to handle it.

[stridera]

I actually checked that. The hub is definitely at 5v. I know it supports up to 3A, so I wondered if there was no current limiting features on the board so it was accepting the full 3amps and frying it. Not sure. Also, I plugged the hub in first and tried to plug in the board while it was powered on (for the first board.) I think I saw a spark, as it touched the usb port. Makes me think there is a power differential. They're both plugged into the same place so there should be a common ground, but I'm not sure. Before the second board, I tested everything I could.

Colin is letting me RMA this one last time and I'm afraid to plug it in. (If I fry it again, it'll be a $80 fix each time.)

Do you guys have it plugged in via USB while the power jumper is on standalone? I really don't want to make this a sddisk only printer. :/ Maybe I'll grab one of my arduino unos and test each motor and switch.

[Chadd]

My power jumper is set to stand alone and I print via USB plugged straight into the PC. I sure wouldn't plug it back in through that hub again.

I actually checked that. The hub is definitely at 5v. I know it supports up to 3A, so I wondered if there was no current limiting features on the board so it was accepting the full 3amps and frying it. Not sure. Also, I plugged the hub in first and tried to plug in the board while it was powered on (for the first board.) I think I saw a spark, as it touched the usb port. Makes me think there is a power differential. They're both plugged into the same place so there should be a common ground, but I'm not sure. Before the second board, I tested everything I could.

Colin is letting me RMA this one last time and I'm afraid to plug it in. (If I fry it again, it'll be a $80 fix each time.)

Do you guys have it plugged in via USB while the power jumper is on standalone? I really don't want to make this a sddisk only printer. :/ Maybe I'll grab one of my arduino unos and test each motor and switch.

[Draud]

My board is in standalone and I can print via usb if I wanted to. It really sounds like the board doesn't like the powered usb hub.

[tsteever]

Can you take a picture of the board wiring? I'd like to take a look. I know that Colin confirmed everything is okay but a second set of eyes can't hurt. I had to switch my jumper over to load the firmware. Now it is in stand alone and I have always had a USB hooked up to either my computer or the Pi as I try to get octo print up and running nicely.

[stridera]

Sure, here are all the pics I sent Colin. (Board is on it's way back right now.) Images are too load to upload so I'll just provide links to them on my server.


http://www.stridera.com/wp-content/u...227_112417.jpg
http://www.stridera.com/wp-content/u...227_112453.jpg
http://www.stridera.com/wp-content/u...227_112517.jpg
http://www.stridera.com/wp-content/u...227_112538.jpg