Laser questions
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That depends on how you are measuring the voltage. If you measure the voltage between the two fan header pins with nothing connected, you should get 0V at S0 and 5V at S1 or S255. However, what I think you are doing is using the Fan- pin from the fan header to feed an on/off control signal to the laser module. In which case, the voltage on that pin relative to ground will be 0V at s1 or S255, and at S0 it will be whatever voltage the laser control input pulls it up to. You may need to add a pullup resistor from that pin to +5V to get a reliable signal level.
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I was measuring the two fan header pins with nothing connected and was showing near 5v regardless of S0 or S255 this was on the first fan header P0 or whatever it is (not the always on fans) Then I tested the remaining two fan headers and they did work as expected showing near 5v. If I connect the 12v from psu to the laser, it turns on.(sweet) Now if I remove the 12v from psu and connect it to the fan header with 5v jumper set going to laser, I would expect to control it via S0-S255. Which I had working at one point. It worked this way for a little bit but now, no matter what I set the S value to, it doesn't change one bit. No on/off functions. I tried that on the other 2 headers and received the same results. Next if I have 12v going to psu. the fan header going to the TTL header on the module, it will turn the laser on. Though I will not have on/off controls through any of the S values.
not sure if the laser control module is toast or what at this point. Because it was working as I expected until I saw it while on, without the neg wire connected.. it came loose from the psu. Don't think that would have caused an issue as it wasn't like that for a long time but who knows
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Without the negative wire connected, the laser may have drawn its power form the fan pin. Depending on how much current it needs, that may have damaged the Fan0 mosfet and/or the laser module.
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What other tests can I do to find out? Why do the other headers test with the same results? How hard would it be to replace the mofet. Hoping it's not my issue.
Man this totally sticks because I bought it from the UK and not filastruder here in the us. I'm sure it wouldn't be warrantied as I did the damage basically
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I suggest you test the fan outputs by connecting a fan to each one in turn, and seeing whether you can control them.
Fan MOSFETs can be replaced.
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I have done that. No control on the fan. I know the fan works as it turns on with the always on header.
Does the MOSFET control the three headers? How comfortable do you have to be to replace the MOSFET? I'm not the best st soldering and don't have that ribbon thing to remove solder. I've got a cheap resolder iron though.
I'd need to see where it's placed on the board -
Are you saying that none of the controlled fan outputs works? Did you remember to disable thermostatic mode on fan 1?
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Not sure, I'd have to check when I'm home again. I know that's how fan0 is set.
That's h-1 correct? To disable it? -
Yes H-1 disables thermostatic mode.
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Ok, tested this morning, Fan header P1 and P2 work as they should S0-S255 off/on, sweet thats great news. I noticed when I was moving the fan from one header to P0 the "bed heater current" changes it's currently at 2000c and the heater is off. When I plug in the fan on P0 it fluctuates. I have my hotend thermistor hooked up and it's current is 19.0c currently so I'd expect the bed to be the same and not show differently. I even see a spike on the graph when the fan is connected to the P0 header. so why is my bed thermistor only active when there is a fan connected to it? anyone back to the fan header… P0 does not work under M106 S0-S255. I took some screen shots showing the Bed reading at it's different rates I mentioned but was unable to post them in here?
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So it's just the fan0 mosfet that is blown.
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Hopefully. What's it look like. Where on the board is it? Sorry I'm not super familiar with it all
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It's the 3-pin device labelled TR5, close to the fan voltage selector jumper.
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thats a little small but I might be able to manage it. I don't think I've soldered much smaller than that. Also why would the other things act up per my above post. Not to mention that in the web gui, I know only see Fan0 and no fan 1. under the misc. area at the bottom. Did I change something in the config file to remove it?
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Also is there a way to make header P1 the default vs P0? If not I will use P1 for now until I get a mosfet for P0
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Which fans you display in DWC is selectable in the Settings/User Interface page.
I suspect you have a poor connection in the bed thermistor wiring, perhaps in the crimp connection where it plugs into the Duet.
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Perfect, I was wondering how they went away to begin with. either way thanks for the help on the user interface page. That worked out great. Last question because I want to make sure I get the correct Mosfet, do you possibly know it's part number or have a link to the ones used on the board?
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There is a wiki page giving connector and spare part numbers.
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There is a wiki page giving connector and spare part numbers.
Thank you, I didn't even think to check the wiki for something like that. while I wait for the mail. I'm using another header.
I wonder if I could use a different header all around. Do you have any suggestions? I've seen talk about using the extruder… I think it was.
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Got the MOSFET installed, I now have fan control again… it looks a little rough but it works.. Gah those things are small.
anyway, still have an issue with the fan not turning off when 12v psu connected to 12vin on module and ttl connected to fan header. If I don't use the TTL it works via fan to pulse the laser on and off.