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SoliForum - 3D Printing Community → XYZ Printing DaVinci → Fuse for 12 volt extruder
Does anyone know if there is a fuse for the 12 volt power supply that goes to the extruder? I had a broken wire and was checking to see if there was power going to the extruder heater and accidently let the leads touch and now the tere is no power coming to the extruder heater.
They use a zero ohm surface mount resistor in place of a fuse. It is near the large white connector on the main board and I believe they are marked R24 and R25. There are actually two.
Please delete your second post to avoid discussion and confusion with two of the same threads.
Hey carl, do they use zero ohm resisters as fuses near each power input source? I wanted to confirm before I try to repair an old mb
Hey carl, do they use zero ohm resisters as fuses near each power input source? I wanted to confirm before I try to repair an old mb
Yes they do..
They use a zero ohm surface mount resistor in place of a fuse. It is near the large white connector on the main board and I believe they are marked R24 and R25. There are actually two.
Please delete your second post to avoid discussion and confusion with two of the same threads.
Is this the resistor I need to replace? And do I need to do R 24 also? Can you tell me if this is a newer or older board. I have seen where they say the SD card is on the back how are mine is on the front as you can see in the picture.
carl_m1968 wrote:They use a zero ohm surface mount resistor in place of a fuse. It is near the large white connector on the main board and I believe they are marked R24 and R25. There are actually two.
Please delete your second post to avoid discussion and confusion with two of the same threads.
Is this the resistor I need to replace? And do I need to do R 24 also? Can you tell me if this is a newer or older board. I have seen where they say the SD card is on the back how are mine is on the front as you can see in the picture.
That is a newer board. The older boards used a full size SDcard mounted at the right end. As for the resistor you need to get a meter that can measure resistance and confirm it is bad. It should measure no higher than 10 ohms if it is good.
Hi guys, can anyone tell me the value or the number that is printed on R25? I can't make it out in the photo. I tried shorting this out and in so doing lost the resistor. The bed and extruder are now over heading, I'm thinking the MOSFET is permanently switched on.
First Carl thanks for all your help. Now I'm not the sharpest tool in the shed. But with my volt meter set as in this picture I'm getting a reading of 9.95 on R25. Is that what it should be? If it is can you tell me what else I should check?
103 is what I see as the number
I get 10.06 k ohms in circuit
R25 is not the right resistor. You are looking for a 0 ohm resistor and it will be marked as 0 or 000. A marking of 103 is 10,000 or 10Kohm. R24 was on the original board. This is a newer board. Not sure what the correct reference mark is on the new board.
The meter is set on the 20K scale so your reading would indicate 9.95K ohms which is correct for a resistor marked 103. Sorry I can't help more but I have no experience with the new board.
an example is what carl is talking about is these here.
I just fixed my extruder it. here is what I did.
I used a 4 amp fuse to protect the circuit from damaging anything else in case of a catastrophic disaster. 4 amps at 12v =48 watts that the heater should never exceed
Just making an educated guess as a tech I am going to guess the resistor we are looking for on the new board is this one I marked.
you guys are looking at the heat bed not the extruder!
how do I make my pic show up like that?
Hey carl that resister mesures as a 10k (r20).
the photos I supplied are from my aio board the pcb is a different color but it is the new board.
I think he wants to check r279, r280 and r281
(deleted my other post with the photo of my board that had wrong numbers to look to help keep it clearer as to what one to look at)
R271 is his problem I will put money on it.
NO R271 lol right above where it says j4 on your pic mark
I literally just fixed mine 1 hour ago my machine made it 501 hours before it quit extruding!
Oh Damn your right, my bad... I keep forgetting they used such flimsy wires for the extruder.
Very well could be . hopefully between us all we can get him up and running.
Too many techs in one room... 
To get the photo to show up click on upload photo image and then browse to the photo and select it
I like your fuse. hmm wonder if I should just put one inline.
I think it is safer to run a fuse.
It would save having to fix the main board. What amp fuse are you using. I don't know how much the heater can pull so not sure what value to use.
SoliForum - 3D Printing Community → XYZ Printing DaVinci → Fuse for 12 volt extruder
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