HBP Mosfet Fried

[3dtopo 0]

Greetings,

I have been using a heated build platform without issue for PLA running 65C for the first layer and 50C for the print.

I just tried printing ABS and set the bed to 70C. Shortly after it reached 70C I noticed smoke coming from under the Ultimaker.

It was Mosfet for the heated build platform that was smoking. Can anyone tell me the specs for a replacement mosfet? A Mouse part number would be great! Commanding the build platform to heat no longer turns the heater on.

I am not sure, but I think the mother board fan might have caused the problem. I just noticed that the fan turns on when I first power it up, but after a minute or so the fan turns off. I think I will hook the fan up to an external power supply, but seems strange. Anyone have any idea about it turning off?

Thanks!

[Daid 304]

Which electronics version did you have? Older electronics had 5Amp mosfets, newer have 50Amps mosfets. You should be able to get the part number from:

http://reprap.org/wiki/Ultimaker%27s_v1.5.6_PCB

 

[3dtopo 0]

I have the 1.5.6 board with 50amp mosfets. The mosfet is STP55NF06L which I ordered from Mouser for $1.40.

Meanwhile, I snagged the mosfet from heater 2 since I currently only use single extrusion, and, even after commanding the heated build platform off it is stuck on. I reset everything, and still on.

Any ideas?

[3dtopo 0]

Is it possible to configure the firmware to use Heater 2 for the heated bed?

It is not immediately obvious if I can configure the firmware to do this with

http://daid.eu/~daid/marlin_build/

 

[3dtopo 0]

Can anyone please tell me what is the G-Code to set the temp on extruder 2?

[Daid 304]

To heat up the 2nd extruder you need to use "M104 T1 Sxxx" The T part controls which extruder you heat up.

You could also swap the pin configs around, but then you need to compile Marlin yourself.