fetasigma wrote:ok so I did some testing on the unit myself with my multimeter, there is continuity in the heater circuit and it heats up under external power just fine. The resistance on the circuit is 4 ohms, the thermoresister on the extruder head responds to external temperature changes just fine. There is continuity in the lines between the main motherboard and the the extruder head. There is no power coming off the main board to power the extruder so the problem appears to be coming from the motherboard. does anyone know if there is a step by step guide on fixing the resistor on the main board ?
Can't really step by step soldering. You either know how to do it or not. You just have to confirm if they are bad. Shoul measure a few ohms or less each. They are close to shorts but designed to burn out like fuses.
If they are bad you just desolder them and solder new on in place. Or you can just solder new ones as piggy back on top of the old ones.
What burns them out is cleaning with the brass brush while the heater is energized.
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