@droftarts "Fan MOSFET blown - using different pin on RRF2.x" could be good, or something like that, it's up to you, thanks!

@droftarts said in FAN mosfet probably blown:

Edit the first post, you can change the thread title there.
Ian

impossible, too late... 🥺

@droftarts sure I can use an external MOSFET or a Fotek SSR.
thank you very much, M106... A is exactly what I was looking for!

@Phaedrux Summer laziness, now I need my 3d printer to be working reliably for a while. during Christmas holiday I will upgrade to RRF3

@droftarts Oh my god I totally missed that line in the guide!
so, if I correctly understood:

say I wanna use pin 8 <--> HEATER3

this should be these gcodes:
M307 H3 A-1 C-1 D-1
M42 P3 I1 S240

I can't try right now, my damaged Duet3D is still under repair, but I will try as soon as possible.

Last question:
I will need to change my gcodes and my slicer settings, will I?
because FAN0, FAN1 e FAN2 are connected to specific pins (20-22), but my new fan1 should be pin 8, so what?

p.s.: I would like to change the thread title so that it will be more inherent with current content, but....is it possible? I can't find any button or settings

@droftarts thanks for your help!
I understand your code, the problem is I'm under RRF 2.05.
Yes I know I should upgrade, it will be the next step.

But: what to do with pins, PWM and expansion port under RRF 2.x?
I know about M42 but, obviously, I get an error, like

M42 P3 I1 S240 --> Error: M42: Logical pin X is not available for writing

this sounds ok, since I didn't define that pin with M950 like you did,
but M950 is for RRF 3.x only.
Which command for RRF 2.x?

@Phaedrux I'm gonna changing them, with the aid of a local laboratory.

Concerning expansion port, I know I can't use for a direct load,
so I should use a simple Fotek SSR.
But...which command and which pin?

It should be M42, but I'm having difficulties in order to understand the online guide and docs, which pin is available of PWM and pin numbering,
so any help will be appreciated, at least an example (ok, I don't want to get out of contest, here we are for mosfets)

I'm subscribing to "Stupid Guys Blowing MOSFET on Duet - Club".
Modifying a delta 3D printer effector I probably shorted FAN1 and FAN0 on an old Duet 3D board v1.03, inverting polarity, so now this is what I'm facing:

• FAN0 not working in any way
• FAN1 not working in any way
• FAN2 seems to work but it never stops

3D printer still works, I had to print some PLA and connected fans to "Always on" pins and it worked, but, ok, it is not a real solution.

I did some test, using Test Fan macro and a multimeter, shorting on endstop because I removed Duet board from 3D printer, and these are voltages I collected

MOSFETs seem to be good at first sight (see photo)

I made also measures about gate to source on MOSFET, results on the first image.

My question: is this weird behaviour probably due to damaged MOSFETs?
since it is difficult to change them I would like to know more before starting desoldering,
Or could I use some PWM pin on expansion port? I had some readings but I didn't understand if this is possible

@chrishamm ok thanks! I will have a look for DWC 2 indeed!

I'm on 1.22.6 because I prefer this version, is it possible to have " Last modified files" as default here too?