1 Topic by satman49

  • satman49
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Topic: extruder, voltage at board

I have been trying to troubleshoot my hotend issue. I found a working heater( works outside SD) From this picture I am assuming there should be 12v across  the 2 pins. Is that correct? If so I am not getting anything but I do get 12v from one pin to ground.The wiring harness is ok as I get same results at the extruder motor end.( credit to mohamd for pic)

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SD3, E3D hotend,linear bearing on x/y axis',pillow block bearing on y conneting rod, ball bearngs on front y axis, fan on y stepper motor.

2 Reply by ronsii (edited by ronsii 2013-12-24 06:30:03)

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Re: extruder, voltage at board

Probably the mosfet is bad or a solder joint between it and the headers

edit: do you get a trigger voltage to the mosfet?

3 Reply by satman49 (edited by satman49 2013-12-24 07:20:41)

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Re: extruder, voltage at board

I took the board off the back and was checking solder connections, all looked good. Then while it was loose I rechecked the voltage again. Low and behold , now I have 12v across the pins.Go figure  . smile

SD3, E3D hotend,linear bearing on x/y axis',pillow block bearing on y conneting rod, ball bearngs on front y axis, fan on y stepper motor.

4 Reply by ronsii

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Re: extruder, voltage at board

The pin(mosfets) closest to the power(12V) in connection is the gate so turning on/off heat in RH should show up on this pin.

5 Reply by satman49

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Re: extruder, voltage at board

ronsii wrote:

The pin(mosfets) closest to the power(12V) in connection is the gate so turning on/off heat in RH should show up on this pin.

12v? I'll check that.

umm now I lost 12v across the pins again after reattaching the board to the case.

SD3, E3D hotend,linear bearing on x/y axis',pillow block bearing on y conneting rod, ball bearngs on front y axis, fan on y stepper motor.

6 Reply by ronsii (edited by ronsii 2013-12-27 20:32:59)

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Re: extruder, voltage at board

don't measure them 'across', measure with respect to ground... one lead to ground one lead to pin.

ooops, I am talking about the pins on the mosfets.

7 Reply by satman49

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Re: extruder, voltage at board

As I was measuring the voltage on the mosfet, (about 5v) I jumped over to extruder pins and now have 12v again. Got me baffled.

SD3, E3D hotend,linear bearing on x/y axis',pillow block bearing on y conneting rod, ball bearngs on front y axis, fan on y stepper motor.

8 Reply by satman49

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Re: extruder, voltage at board

Oh well, still no good. voltage is itermittent. Can I use an external 12v just for the extruder?

SD3, E3D hotend,linear bearing on x/y axis',pillow block bearing on y conneting rod, ball bearngs on front y axis, fan on y stepper motor.

9 Reply by satman49

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Re: extruder, voltage at board

Well, I bit the bullet and ordered a new board.I was checking my purchase history and so far since I had my SD3  I bought over 400.00 worth of replacement parts.I didn't know cost of ownership would be that high for just one year.On a positive note, the squeaky wheel does get the grease.SD called me back and assured me of prompt shipment.

SD3, E3D hotend,linear bearing on x/y axis',pillow block bearing on y conneting rod, ball bearngs on front y axis, fan on y stepper motor.