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USB cable starts overheating when Power Supply is turned on

Hi guys, so I have just finished my first build of a Reprap Air 2 XL version using Sanguinololu. Connected: - Steppers - Hotend - Stepsticks - Hotend temp sensor I didn't connect the Heatbed MKII and...

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Re: USB cable starts overheating when Power Supply is turned on

Sounds like an extreme case of the problem described here: [forums.reprap.org]

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Re: USB cable starts overheating when Power Supply is turned on

New problem: LED doesn't turn on anymore, Sanguino broken now? Ok turned out the polarity of the power supply wasn't right. So I turned it around and everything worked without overheating USB cable. I...

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Re: USB cable starts overheating when Power Supply is turned on

Actually it turned out my Multimeter was malfunctioning and the polarity was working correctly in the first case. Now after I switched the polarity I probably broke the Sanguino. Anyone knows what can...

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Re: USB cable starts overheating when Power Supply is turned on

Wow, you've been really, really lucky to only have one driver broken. I'm amazed the motherboard of the computer isn't broken, or that the Sanguinololu isn't complete toast. I can only think that the...

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Re: USB cable starts overheating when Power Supply is turned on

Yep I think you are right. But I'm still having the same issue, my USB cable fries when I turn on the power (correctly set-up this time). I just fried my second USB cable. It just melts the F* down...

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Re: USB cable starts overheating when Power Supply is turned on

To heat up a cable, one needs considerable current, so can assume there is an obvious short somewhere. Only need to identify where the short is located. This should be fairly easy with a multimeter,...

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Re: USB cable starts overheating when Power Supply is turned on

I replaced the stepper that was broken on the Sanguinololu board, I turned on the device without the USB cable in. Immediately the stepstick that I replaced started to heat up like crazy while all the...

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Re: USB cable starts overheating when Power Supply is turned on

Take out that stepstick (and all others, and everything else that can be disconnected) and offline (no power) measure resistance at its points, between the 12V, 5V to ground. Both on that stepstick...

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Re: USB cable starts overheating when Power Supply is turned on

Check for shorts near that driver socket. There's probably a short between 0v/5v and 12v/1a/1b/2am/2b

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Re: USB cable starts overheating when Power Supply is turned on

Do the measurements on each side after all parts have been disconnected / taken away. For example 1a 2a 1b 2b are stepper driver outputs and once the driver is out of its socket, these lines should...

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Re: USB cable starts overheating when Power Supply is turned on

Hey, it's not getting any clearer. I can't seem to find much wrong here.. I have emailed the seller and we agreed on me sending to him the power supply, the sanguino and the stepsticks so he can check...

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Re: USB cable starts overheating when Power Supply is turned on

If it would be a guess i would think the 7805 failed and lets the full input across output and hence it gets sinked through usb cable. Could try check that. Discovering a short somewhere would of been...

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Re: USB cable starts overheating when Power Supply is turned on

Yes, I will tell the seller that that might be the case! Thanks NoobMan :) Btw, is it just recent that the forum keeps being inaccessible? Since today it seems better again, but the last few weeks...

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Re: USB cable starts overheating when Power Supply is turned on

Yes for me too the forums were going poorly in last couple of weeks. I think the amount of info&visitors very is big and its quite a hard and probably becomes increasingly harder to host this -...

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Re: USB cable starts overheating when Power Supply is turned on

For now the 7805 is replaced and the firmware is loaded again. It all seems to work, will receive the Sanguino back in a few days I guess.

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Re: USB cable starts overheating when Power Supply is turned on

Apparently all the other stepsticks were also burned. According to the seller who is checking my board now. Weird, because with those three stepsticks my board worked fine, it only didn't work with...

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Re: USB cable starts overheating when Power Supply is turned on

I think there is a short circuited path in your circuit or in the cable. Check everything before using it again,

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Re: USB cable starts overheating when Power Supply is turned on

I received a new Sanguino board with new stepsticks. Working on everything now, currently stuck at the point of configuring my Stepsticks.. Which I have no idea how to work the formula I found on the...

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Re: USB cable starts overheating when Power Supply is turned on

You need to know the sense resistors exact value. The value that is adjusted from the pot is the voltage between two points. That voltage gives the current setting to drive the motors by formula A =...

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Re: USB cable starts overheating when Power Supply is turned on

first of all, are you informed about the Rsense value on ur stepsticks? with that value on hand, u need a voltmeter to "see" the Vsense ... and u need a small trimmer screwdriver I_TripMax=...

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Re: USB cable starts overheating when Power Supply is turned on

Hey, thanks for your reply, I still haven't gotten things running. I also asked the seller of the equipment, he says that just turning up the meter slowly until the motors work as intended... Not sure...

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Re: USB cable starts overheating when Power Supply is turned on

i guess 0.7v will work too (1.7A drive, about 2/3 the torque i think). but it is always good to find out what the Rsense are. if you have a chance to spot a certain digital multimeter Uni-T UT61E, it...

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Re: USB cable starts overheating when Power Supply is turned on

Just by hand-tuning them I managed to get them all working on their lowest possible energy level. The only thing I find weird about the machine is that my extruder stepper makes a pretty annoying high...

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Re: USB cable starts overheating when Power Supply is turned on

plug your steppers into the ramps (that 4pin thingy) the reverse way (1234 --> 4321), it will move in reverse and it should make the endstops "see" it in the correct direction. is your extruder...

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Re: USB cable starts overheating when Power Supply is turned on

Hi :) I'm using a sanguino with 4 stepsticks, so no RAMPS. But if it can't do any harm to just turn around the connector, then I will do that. Are you sure it wont do any harm? I have a picture here...

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Re: USB cable starts overheating when Power Supply is turned on

yea its ok, imagine a DC motor, reverse the cables to reverse the rotation. its the same, just dont mess up the order. and power down to do it, doing it with power on = fried electronics.

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Re: USB cable starts overheating when Power Supply is turned on

It doesn't matter what side the motor is on for the x-axis. I have mine on the left side.

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