sorry for beeing a newby on 3D Printing, many things to learn about.... Got my A10 with GT2560 V3.0 Board and after printing some more or less nice "dogs" (and some other stuff) i realized that the fan on the hot end cannot be controlled. I did some prints where the fan is set to 0% at the beginning and then goes up to 80% while printing. On the LCD both settings are displayed, but the fan is at 100% all the time.
I already read some topics about replacing a MOSFET (Q5 for example), but these topics are always about older GT2560 boards. Does anyone have some experience with the Version 3.0 and fan problems? On my board only E0 is in use. The only 3-Pin MOSFET on E0 is Q2, which looks okay. It´s difficult to reach with soldering iron, so i would prefer "other ways" before i will start soldering. Is there any documentation on the pinout? I already spent some ours of searching the forum without success.
Check out the link in the first post.
I changed the Q2 from AP2306AGN to a new one (IRLML6344TRPBF) without success. Fan is still running on 100%.
I measured all cables from GT2560board to the hot end incl. the Geeetech extruder Extension Board. I found a short circuit from the left "air blower" connector of the expansion board to GND caused by switched cables on the GT2560 H6! This forces Q2s drain to GND all the time, which leads to 100% fan (air blower) all the time. I switched the blue and black cable of H6 on the GT2560 and now the fan goes down to around 50% when fan is set to FanSpeed=0. Not satisfying, but i´m getting more and more to a normal fan behavior.
Next step: I disconnected H6 (something to do with 3DTouch, Pin PC7 of the Mega2560) and now the air blower fan is behaving normal (FanSpeed=0 => no rotation, FanSpeed=0 => 100% rotation). I will go on searching the problem. Because one day i want to switch to autoleveling via 3DTouch and i have to connect H6 again.
Doas anyone know what Z_Min (Pin PC7) in the schematic is used for? Maybe it´s a kind of firmware problem. I´m using Marlin 1.1.8 without 3DTouch.
Still searching for short circuit on the extruder pcb or cabling....
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