Unresolved The extruder does not heat up

The last time i use my printer it stop working because the extruder stop heating so i search on the forum for answers. I noticed thar when i start up the extruder the red light on the RAMPS does not tur on,but when i preheat the bed it turns on . is that a problem ? How i can fix it?

 

If the D10 LED does not light up it might mean that there's damage to the ramps board. Pull it apart from the arduino and see if there's any burnt traces. Usually that happens after a short.

If you can move the motors and enable the fan then we can be sure that it's receiving 12v

 

I can move all the stepper motors,enable the fan and heat up the bed , las time i pull The ramp apart from the arduino no burn trace were visible . Do yo think buying another 1.4 Ramps board will solve my problem ?

 

Yes, but not necessarily required. Could be something as simple as a wire being unplugged.

Got a multimeter?

 

Yea,i have one

 

Let's start by measuring the resistance across D10. It should measure around 6.3ohms.

If that comes back normal there's some more in depth examination I'll start typing up while you do this.

If it's an open circuit then you'll need to check the wire for breaks or loose connections.

 

I measure it and it wont let me get a clear measure but the highest measure was 6.24 hms.

 

There is my problem , you were rigth.

 

That's good enough.

Ok so here's what I want you to do, this will tell me if it's the Mosfet or the Arduino:



It might be kind of hard to make out but there 4 tests I want to do. With the heater enabled in the firmware probe between these points.

The first is the Red value. Measure between the + terminal on D10 and the - terminal on the input. This should report back 12v.

If this is good we know there's power coming in.

The second test, Blue, is to measure between the Arduino pin input and the ground. It's the 6th Pin in.This should report around 3v-5v when the heater power is enabled. This will tell us that the arduino is sending the correct voltage signal to the ramps.

If that is correct then measure the resistance from the pin to the first leg of the mosfet, in purple. This should report back around 10 ohms.

If that is correct then measure the resistance/continuity from the middle pin on the mosfet to ground, in pink. This should report back around 0 ohms for a closed circuit.

If all those things pass the test then we've almost certainly isolated the issue to the mosfet. One final check we can do is not shown, measure the continuity between the 3rd mosfet leg (left of pink) and the (-) terminal on D10 (above red).

If that reports back as good then it's almost certainly the mosfet failed closed. You can buy a stp55nf06l for much less than the cost of a new ramps board.

Granted it could be something simple as a loose solder point.

If this is still under warranty then I suggest doing a replacement part request. But that can sometimes take a bit of time and repairing the ramps isn't too difficult.

 

Damn after I typed up that whole thing and everything.

Alright if it's still under warranty submit a replacement request. Otherwise you can repair the trace with some solder and probably swap in a new mosfet as I said above.

 

Sorry man , thanks for helping and sharing your knowledge . will try with solder and if not I'll buy a new one. thanks

 

It happens. I found when I repaired mine the mosfet failed open. So be careful when you power it back up.

 

Maybe i play it safe and buy a new one .

 

I repaired the ramps and the red ligth stay on , that is no good rigth?

 

Yup, like I said that means the mosfet is blown. You can buy a new one for like a dollar and solder it in.

Or buy a new ramps for around $20

 

Thanks

 

Mike where can you buy a ramps card for $20.00. I bought one on ebay and its not really very good.

 

Amazon. I never said they'd be good though.

 

Mike, i need your help

My printer start to make the first layers then this error appear