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i donno how but my Y belt was loose
i removed the end and tightened the belt, as tight as the one in the video
then i tried extruding 100mm from the extruder, but it only extruded 30mm from the mark i made on the filament
so i decided to clean the hot end once and for all
here is how it looks like now.
i'll put it back later on as i have to go out

 

i think i screwed up something

after i cleaned the hot end and put back everything and turned it on. the hot end wasn't heating up
i realized i wrapped the resistor with the two ends touching the copper hot end.
i unplugged everything and isolated the wires from the hot end. but after i put everything back it still didn't work
i have some current flowing through it as my tester shows. but no heat

did i burn the board ? or something on the board ?
how can i test this ?

 

You're gonna need to remove your ramps board from your arduino board and take a look at the traces to see if you blew something.

I shorted my extruder out and it blew a trace and my mosfet. I've since fixed it but first we need to see what the level of damage you've received. Hopefully you didn't blow a trace and we can just replace the mosfet.

Unscrew your ramps/arduino combo from the case and pull the arduino board off. It might be a bit tricky but it'll come apart.

Once you look under the board for any blown traces. It'll be real obvious. then look at your mosfet for any charring or ashes

Let me find that link I found before about how to test mosfets.

 

i get a 7.2 ohms reading from it when i test its resistance?
and i get connectivity

is it possible i burnt something on the board ? anything i can check ?
i checked the D10 but getting a weird reading
i tested the D9 (Fan) on %100 giving 12v

 

100k at 25C, hence 100k thermistor

 

meh ...

 

Looks just like mine!

Sorry man, I hope you've got some soldering skills to remove that and replace the trace. Otherwise you'll need to order a new ramps.

 

my soldering iron is 60W
is it too hot for an electronic board ?
i usually use it for electrical work

 

That's pretty hot but if you're quick with it it shouldn't matter.

The first step is removing the dead mosfet. A lot of people swear by copper braiding for solder removal but i could never get that to remove everything so I stopped using it. I much prefer the solder sucker bulb desolderer like this one from rat shack: http://www.radioshack.com/product/i...62731&filterName=Type&filterValue=Desoldering

Here's the part # for the mosfet: STP55NF06L

Link to mouser page: http://www.mouser.com/Search/Produc...06Lvirtualkey51120000virtualkey511-STP55NF06L

For the trace repair, you can do it properly by laying down new copper or you can do what i did and just use solder as a jumper. Or solder in a piece of wire.

 

Mark, you're thinking of the conductive ink pens like this one on Adafruit:

http://www.adafruit.com/products/514

But yeah, I'd just use a jumper. I blew my RAMPS board too but I cannot tell where it's blown from a visual inspection. I went ahead and bought both a new RAMPS and Taurino board since I couldn't visually see where it was damaged. Later, after wiring in the new boards and moving all the connections to them, I separated the old RAMPS from the old Taurino and the Taurino powered up fine and communicated so it looks like the problem is on the RAMPS board. Now I just need to figure out where. But if nothing else I have spare parts now if needed.

 

cheers for the help, will let you know how it went.