Geeetech

Hi,
After replacing the filament fan (PWM connector) with a new now the PWM fan is always rotating, even the printer is idle.
If I increment the fan speed in the menu it increase the speed. It seems the "0" PWM status it's no mora at "0".
I've checked Q5 and seems to be good.
I have a Geeetech Prusa I3 pro b with GT2560.
I tried to reflash firmware but with no results.

Does anyone have an idea about this issue?

Thanks & kind regards,
Alex

I remember the "0" on the repetier host menu is not the actual 0 speed, you can slow it down but as you said, will not stop.
check this setting:

Hi Mark,
thanks for your quick reply.
I don't think it's such case because the fan start rotating as soon I power on the printer, even without pc connected. BTW this setting was already unchecked.
If I remember correct the fan wasn't start at power on and I was able to turn it on by me FAN SPEED menù item under CONTROL -> TEMPERATURE.
Now it starts immediatly at around 50% and by change FAN SPEED setting you can increase it from 50% to 100%

I have also tried differen fan with 2 and 3 pin but all behaves in the same manner.

Regards,
Alex

how's the old fan? is it still the same manner? werid...

Even the old one always rotates...
This is why I'm thinking about a problem on Gt2560...
Can a wrong insertion of a 3 pin fan damage the board? If I made such mistake the inversion was between +12 and tachiometric signal (ground is in the middle)
The problem was the wrong pinout of gt2560 schematics I downloaded..
But I remeber at the beginning the old fan was connected in wrong way due to schematics, then I found out with a multimeter the error and after reversing the pin the fan was working well..
so weird....

Thanks & Regards,
Alex

Yeah the signal on the fan connector is not used, just need connect the fan to the + and - of the connector.

Hello,

I have exactly same problem, the PWM fan is always on till yesterday. My all fans... I have about 10, they rotate from 0 -255 doesnt matter.
Any solution? I chenged firmware again but didnt work.

smokehead wrote:Hello,

I have exactly same problem, the PWM fan is always on till yesterday. My all fans... I have about 10, they rotate from 0 -255 doesnt matter.
Any solution? I chenged firmware again but didnt work.

So did you check the slicing setting in the above picture?

I use cura, and i know that setting, anyway when You turn on printer fan should not working in pwm when on LCD You have "0". My is working.

Alright...I guess the mosfet controlling the PWM fan may be not working properly.
Check this post:
http://www.geeetech.com/forum/viewtopic ... 24&t=17886