A5 massive heating problems

aemkie

Hey there,

my printer faces some really crazy heating problems. 

After changing heating cartridge and thermistor the printer heats up like crazy. When I start the machine it heats up to 180 degree in about 30 to 45 seconds but doesnt stop like he is told. The printer heats up to 360 degree and even more.

What can I do?

Samuel Pinches

360C is dangerous. Please be careful, don't allow that to happen (turn off the power) as toxic fumes will be produced by the PTFE liner in the heatbreak, above the nozzle. It sounds like the "switch" that controls the nozzle heater being on or off, is stuck in the on position. This part is called a mosfet.

On the A5 there are two options:

1. Order a new motherboard
Aliexpress: http://s.click.aliexpress.com/e/bXQqiPB2
banggood: https://www.banggood.com/custlink/vKGmov8CTI

gearbest: https://www.gearbest.com/3d-printer-parts/pp_1357525.html?lkid=14884857

Amazon: https://amzn.to/2KWbza1

2. Solder a new mosfet

aemkie

thx for your answer. Well I have this board here  so is it the a5 version? and where do i find the mosfet here?

Laser8302

2 options.
1) Modify the firmware to use hot end 1 instead of hot end 0 for heating and move the wiring.
2) Order a new MKS GEN L V1.0 board from aliexpress, it's only ~$20USD and usually comes with the motor driver chips. You'll just need to load it with either the stock or the community firmware once you install the board.

Here's one for 19.60 Euros:
https://www.banggood.com/de/MKS-GEN-L-V1_0-Integrated-Controller-Mainboard-Compatible-Ramps1_4Mega2560-R3-For-3D-Printer-p-1270450.html?rmmds=search&cur_warehouse=CN

aemkie

I choosed option 2. Thank you very much!

Samuel Pinches

I’ve updated the links in my post and renamed this to A5. Good luck @aemkie