Somethings up, "Dead"ish after endstops

So I might have miswired up my end stops, because something strange just happened to me.

Had her all wired up, but hadn't gotten end stops setup. Working otherwise.

I'm fairly sure I had it wired right. But then again, I could be wrong. These silly end stops are PCB mounted and all that jazz.
Plugged in end stops to try the "auto home".
Hit auto home, clicked one of the end stops in hand, it stopped.
Then the LCD started flickering same with LED1 for power.

Turn it off, turn it back on, same flicker.

Tried powering it via USB? Seems to be fine.

Back to power supply? No go.

So any ideas? Reflashed the firmware, same problem.

Edited 1 time(s). Last edit at 06/14/2013 05:35AM by Topdecking.

Follow up,
USB plugged in, power on PSU, unplug USB, still goes back to flickering LCD and pulsing sound from the board.

... most common wrong wiring or short to power and/or ground ...

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Viktor
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Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]

Right. So is it dead? What would you think to replace?

... this depends on the individual failure and embedded/wrecked parts ...

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Viktor
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Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]

Any reason it seems to be working fine via USB and not via power supply then?
Or any suggestions on how to diagnose?

Okay trying to figure out where reprapdiscount sent me wrong.
The end stops are Mech Endstops v1.0 INSTEAD of v1.2, that's only the start.
They have three pins on the pcb, they provided a set of three wires plus plastic in a thing labeled endstop, etc the kit.
That plugs into the block of pins at the top right of the RAMPS pcb for the end stops.

Apparently most people only use the two pins at the top.
Using the wiring they provided.

From top to bottom on the RAMPS, I ended up wiring in
VCC
GND
SIG

Which is backwards to this diagram I just dug up...
[forum.germanreprap.com]

Am I just looking at replacing the RAMPS board? Damn what a pain in the ass.

Power via PSU no go.
Power via USB, then PSU on, lets me run motors and everything seems fine.

So anyone have any ideas?
The drivers are fine.
The arduino seems to be fine.

I suppose the RAMPS is in the crapper because of a reversed end stop wire? I'm amazed there isn't any kind of protection for that.

... provide some images of your setup so people with the same board can help with 'remote diagnosis' ...

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Viktor
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Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]

Would you like pictures of the board, or the whole system?

... again, depends mostly on your problem and the cause -- maybe an image of the endstop-connectors and wirings would be sufficient, maybe more ... or nothing of them.

You have to specify your setup and proceedings more precise -- which devices, what wiring, voltage levels, polarity, ...

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Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]

have you got diode 'd1' installed ? (it's between x and y stepper jumper connectors, you'll need to remove the x-axis polou driver to see it)

if that's not installed, I don't think you can power the Arduino from the 12v supply only, have to have USB connected to.

assuming your using RAMPS 1.3 here.

Edited 1 time(s). Last edit at 06/14/2013 08:57AM by Masnachu.

Using RAMPS 1.4
System have been running previously NO issues with just 12v switching power supply.
After miswired click on end stop, now it needs USB.

RAMPS 1.4 still has D1 (or D1 is omitted if running off USB aswell), if 12v PSU ran everything on it's own before and now it doesn't, maybe D1 blew ?

Edited 1 time(s). Last edit at 06/14/2013 09:12AM by Masnachu.

Very interesting idea, exactly the kind of info I was looking for.
Apparently this kind of error should have blown D1 or D2?
And if its still running from USB just fine then the RAMPS itself is fine.

Sounds like I need to start replacing possibly blown surface pieces and the board should survive.

Gotta pull the drivers off and take a peek at D1, D2 kinda looks normal though.
None of the caps look blown.
Seems +5V to Ground though on Arduino blows fuses though, almost always on the shield.

Any other thoughts?

The end stops will have shorted the 5V rail to ground. That has probably damaged the 5V regulator that takes 12V and produces 5V so it only gets 5V from the USB.

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[www.hydraraptor.blogspot.com]

Not sure on the testing (normally I'd have to do some reading before knowing how to test stuff properly)


The only stuff I have on ramps are wikis Ramps 1.4 and RAMPS 1.3

So what do you think? Replace the 5v MOSFET/regulator as well? Those things don't normally die in my experience, at least not from a short to ground.
I'm probably ordering another RAMPS board anyway, but it would be interesting to bring this one back to life.

Like Nophead said, backwards wiring on the endstop means you probably shorted 5V to ground. The 5V on RAMPS is supplied by a linear regulator on your Arduino Mega. That linear regulator gets its 12 V through D1 on the ramps board. So either D1 is blown, or your regulator on your Arduino is blown. Checking D1 is pretty simple with a decent multimeter. If it has a diode drop measurement on it (looks like a diode symbol), then pull your RAMPs off your Arduino and use the diode drop check across D1. If you try it both ways and don't get a reading, then your diode is blown.

If the diode is good, then plug the RAMPS back in, power it with only 12V, and check for voltage between the + and - pins on the endstops. If you don't get any voltage there, then you've more than likely blown the regulator on the Arduino Mega and need to either replace that regulator or the whole Arduino, depending on your soldering skills.

Perfect KSevcik, thank you for the instruction.

Hi Topdecker - I have inadvertently shorted the end stop wiring as you have described with the same symptoms. What did you end up having to replace?