RUMBA board shorting out

[stridera]

Oh, I see. I thought that with my hub (since it's connected via a UPS.)

However, the raspberry pi and the printer were connected via the same power strip. Thus, the line/neutral are connected and there shouldn't be a differential. I'm not home, but I can check later, however, I can't see how it could be different.

[Mjolinor]

Oh, I see. I thought that with my hub (since it's connected via a UPS.)

However, the raspberry pi and the printer were connected via the same power strip. Thus, the line/neutral are connected and there shouldn't be a differential. I'm not home, but I can check later, however, I can't see how it could be different.

That doesn't matter. The output from the supply is naturally floating unless there is something preventing that like the negative from the DC connected to the ground. If you do not have that then potentially ground on the printer will be -6 (assuming a 12v dc) compared to ground on the PC.

[BLKKROW]

Have you double checked the jumpers on the board to make sure they are all in the correct positions?

[stridera]

Yeah, did that after the first board. Everything works and I've been printing lots of fun stuff, but I'm still afraid to attach anything to it. I bought this and hooked it up to my power rail, so with the shared ground I'm hoping it will prevent the next raspberry pi from shorting out... once it arrives. http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1

[stridera]

So, the new Raspberry Pi shows up and now I get the following:

[  740.499047] usb 1-1.3: new full-speed USB device number 16 using dwc_otg
[  740.579015] usb 1-1.3: device descriptor read/64, error -32
[  740.769245] usb 1-1.3: device descriptor read/64, error -32
[  740.959289] usb 1-1.3: new full-speed USB device number 17 using dwc_otg
[  741.039028] usb 1-1.3: device descriptor read/64, error -32
[  741.229015] usb 1-1.3: device descriptor read/64, error -32
[  741.419004] usb 1-1.3: new full-speed USB device number 18 using dwc_otg
[  741.838948] usb 1-1.3: device not accepting address 18, error -32
[  741.919047] usb 1-1.3: new full-speed USB device number 19 using dwc_otg
[  742.339105] usb 1-1.3: device not accepting address 19, error -32
[  742.340747] usb 1-1-port3: unable to enumerate USB device

I guess it shorted out the usb chip or something on the board. (I get the same thing from my Mac when I plug it [battery only])

I wanted the rumba so I could use the graphical display and multiple extruders, but now I'm not so sure it was a good idea.

This is very annoying...

[Chadd]

I don't think it is a rumba issue as there are many of us with the RUMBA running off USB with no issues. You for sure have another issue, no idea what it is but something odd is going on there.

So, the new Raspberry Pi shows up and now I get the following:

[  740.499047] usb 1-1.3: new full-speed USB device number 16 using dwc_otg
[  740.579015] usb 1-1.3: device descriptor read/64, error -32
[  740.769245] usb 1-1.3: device descriptor read/64, error -32
[  740.959289] usb 1-1.3: new full-speed USB device number 17 using dwc_otg
[  741.039028] usb 1-1.3: device descriptor read/64, error -32
[  741.229015] usb 1-1.3: device descriptor read/64, error -32
[  741.419004] usb 1-1.3: new full-speed USB device number 18 using dwc_otg
[  741.838948] usb 1-1.3: device not accepting address 18, error -32
[  741.919047] usb 1-1.3: new full-speed USB device number 19 using dwc_otg
[  742.339105] usb 1-1.3: device not accepting address 19, error -32
[  742.340747] usb 1-1-port3: unable to enumerate USB device

I guess it shorted out the usb chip or something on the board. (I get the same thing from my Mac when I plug it [battery only])

I wanted the rumba so I could use the graphical display and multiple extruders, but now I'm not so sure it was a good idea.

This is very annoying...

[stridera]

Perhaps. I just wish I knew what other troubleshooting steps I could use to figure it out. I have test equipment, but the Oscilloscope and multimeter both show normal readings.

[Mjolinor]

So you have measured between the case of the USB on both devices before they are connected together and it is 0 volts?

I don't mean close to 0 volts, even a very small voltage difference between them can pass a huge current between the two devices.

[stridera]

Going from the ground of the usb port (basically the outside metal shell of the port) of both the rpi and the rumba board I get 0v.

[stridera]

Also, I just switched it to usb powered and tried to power the rumba board via the usb only (with the main power turned off) and it wouldn't even recognize the board or power it.

My guess is the usb blew out again. Not sure what's wrong, but it's gone.

So this means I can't control it via the usb nor can I ever update the firmware on this (without removing the chip and using a programmer.)

I'm so confused. Everything else works great. It prints great from a memory stick. But it's really hard to calibrate stuff when you have to create one-off gcode files to do random things. *sigh*