Fan is not running like it should.

[SassyDalmatian 0]

So, recently I acquired a new fan, as my old one was busted. This was same maker, same everything. When I plugged it in, however, my fan started to make this high pitched noise, and wouldn't start via the control board. However, when I spin it's blades on my own, it keeps on running. Thinking this was only the fan model, I plugged in another 24v fan. Excluding the high pitched hum, the exact same problem was there. What can I do to fix this?

[Labern 724]

Is this on UMO+ Cooling fan?

[SassyDalmatian 0]

It is the print head fan on the Ultimaker Original +, yes... Probably should have made that clearer...

[neotko 1,376]

If the new fan has the same specs as the original, maybe the board pwm fan was busted by that short circuit you got (old post I remember you wrote).

So. Easiest way to test if it's the board it's to connect the fan to the led pwm (both parts have the same circuit). Then you need to send the gcode M42 S128 to set the led pwm to 128 of 255. If the fan it's ok it should work. If the problem remains it's the fan.

So if you do that and it works on the led pwm then your pwm fan it's dead (probably a resistor or most probably the transistor since you got a short circuit before).

If so, I did a post long ago that explains (more or less) how to change it (but you need the propper tools and steady hand).

So try that first and if works on the led pwm you might need a firmware modded to change the pwm fan to pwm led, this way you would have a working by gcode fan.

Please triple check before pluging the fan to the led that the +/- it's perfectly in order, doing it wrong might break the led pwm also (if that's the problem).

Edited February 16, 2016 by Guest

[SassyDalmatian 0]

Hmmm... the computer I'm working at doesn't recognize my printer as a device, and wont connect via USB Cable... Is there any way at all to send the gcode over via SD Card?

[neotko 1,376]

Yes. Make a txt file with the gcode commands. Remember to insert a return after each line or they won't work. Or get a gcode, edit, clean, and paste your gcode lines.

Edited February 17, 2016 by Guest

[SassyDalmatian 0]

Okay, so the fan worked as it should. Where should I go to get the custom firmware?

[neotko 1,376]

So fan works when using led pwm. Ok. Then you need to make your owm marlin.

http://www.extrudable.me/2013/05/03/building-marlin-from-scratch/

I use @amedee branch

https://github.com/AmedeeBulle/Marlin

On pins.h under the ultimaker 2.1 board you need to swap the pins of fan pwm with led pwm

Edited February 23, 2016 by Guest

[neotko 1,376]

Btw I bet that the transistor died on pwn fan. If you have a friend or your know how to change smd chips it's quite easy and the transistor chip it's just 0.10€ or so.

Here's how I changed mine

https://ultimaker.com/en/community/17214-fan-pwm-output-0v-umo-board-solved-not-solved#reply-118977

[mariuszem 4]

I did same with Ultimaker Original. There is BD679 to be resoldered.