Hey RepRappers,
So I was experimenting with my printer, and long story short, ended up running 2000 volts through the darn thing, turning the thermistor into a lightbulb, completely frying my power supply, and damaging a number of components. I have since bought a new power supply and thermistors, and fixed up my RAMPS to get everything functioning properly again. Everything moves and works perfectly again… except for one bloody thing.
Although I have new thermistors, the RAMPS is still reading unusual values. For example, it states that the hotend is somewhere between 148 and 151 degrees (No matter what temperature it actually is) and the bed is between 50 and 60. It fluctuates a little bit, but stays in that general area. When I jump the leads with a 10 Ohm resistor, the value does change, so data is getting through. Surprisingly though, removing the thermistors has no effect on the temperature values reported.
I swapped the mega out for a fresh one, but the error still persists, so that leads me to believe that there is some busted component in the RAMPS board itself. I have a new one on order, but since all I am missing is this temperature sensing, it may make more sense to just fix it, since I intend to build another printer at a later date.
Any idea what components in the RAMPS board contribute to temperature sensing so I can test them, or has anyone experienced this issue before?
So I was experimenting with my printer, and long story short, ended up running 2000 volts through the darn thing, turning the thermistor into a lightbulb, completely frying my power supply, and damaging a number of components. I have since bought a new power supply and thermistors, and fixed up my RAMPS to get everything functioning properly again. Everything moves and works perfectly again… except for one bloody thing.
Although I have new thermistors, the RAMPS is still reading unusual values. For example, it states that the hotend is somewhere between 148 and 151 degrees (No matter what temperature it actually is) and the bed is between 50 and 60. It fluctuates a little bit, but stays in that general area. When I jump the leads with a 10 Ohm resistor, the value does change, so data is getting through. Surprisingly though, removing the thermistors has no effect on the temperature values reported.
I swapped the mega out for a fresh one, but the error still persists, so that leads me to believe that there is some busted component in the RAMPS board itself. I have a new one on order, but since all I am missing is this temperature sensing, it may make more sense to just fix it, since I intend to build another printer at a later date.
Any idea what components in the RAMPS board contribute to temperature sensing so I can test them, or has anyone experienced this issue before?