Extruder Overheating without Command

[losgood]

Thanks for the reply Toy.

Here's where I'm at:

-I checked the board and realized the 10A fuse was blown out

-I ordered a replacement fuse and after I installed it, the fuse immediately blew out when I turned on the power

-I then replaced the 10A fuse with the 15A fuse for the heatbed and everything turned on, but my extruder #2 started immediately smoking so I turned off the power after about two seconds.

-I measured the resistance of the heating cartridge on the same extruder #2 and I got 3.7 Ohms, which seems correct.

So I'm thinking there is something wrong with the mosfet, is this correct? I have no way of actually measuring the mosfet voltage though because I can't leave on power to the board without the extruder smoking like crazy.

Also, the mosfet is soldered on the control board and extremely hard to remove, does geeetech really expect me to remove and replace the mosfet myself?

[William]

Thanks for the reply Toy.

Here's where I'm at:

-I checked the board and realized the 10A fuse was blown out

-I ordered a replacement fuse and after I installed it, the fuse immediately blew out when I turned on the power

-I then replaced the 10A fuse with the 15A fuse for the heatbed and everything turned on, but my extruder #2 started immediately smoking so I turned off the power after about two seconds.

-I measured the resistance of the heating cartridge on the same extruder #2 and I got 3.7 Ohms, which seems correct.

So I'm thinking there is something wrong with the mosfet, is this correct? I have no way of actually measuring the mosfet voltage though because I can't leave on power to the board without the extruder smoking like crazy.

Also, the mosfet is soldered on the control board and extremely hard to remove, does geeetech really expect me to remove and replace the mosfet myself?

Hi,
Is your printer Pro C?If it is,the motherboard is GT2560,and for the heatbed fuse,it's 15A.And the hotend fuse,it's 5A.I'm afraid your hotend fuse was burned because of the wrong 10A heatbed fuse,so i think you can change another hotend fuse(5A).And to remove the mosfet for extruder,you need to uninstall the heat sink with a screwdriver,then its easy to remove the mosfet,i believe you can make it.
Regards

[losgood]

Thanks for the reply William Kwok.

How is it possible that a 5A fuse would fix the problem when a 10A fuse is blowing out in the circuit? If a 10A fuse blows out cuz of too much current wouldn't a 5A fuse just blow out as well?

I think my i3 Pro C has a 10A fuse cuz of the dual extruder, and the i3 Pro B probably has a 5A fuse on the control board because it only operates one extruder. But correct me if I'm wrong, I think what I need to do is replace the mosfet which will not be fun.

[cesar77muse]

Hello, I was just trying to do my first project. after i clicked on print, the printer started heating, but when it reached the temperaure 275 celsius it showed the following error:
Error:MAXTEMP triggered,system stopped! Heater_ID:1
Error:Printer halled.kill() called

if anyone could please help me, i will be really happy. i am kind of noob for this.

[William]

Hello, I was just trying to do my first project. after i clicked on print, the printer started heating, but when it reached the temperaure 275 celsius it showed the following error:
Error:MAXTEMP triggered,system stopped! Heater_ID:1
Error:Printer halled.kill() called

if anyone could please help me, i will be really happy. i am kind of noob for this.

Hi,
You may want to give this a try:
http://www.geeetech.com/forum/viewtopic ... 23&t=17030