Hello all,
I have been using my printer for several months now. I just recently printed a part that took 22 hours and then after about an hour break I printed another part that took 7 hours. During both prints everything worked just fine.
When I went to preheat for my next print I got no temp. change on the heated bed.
First, my RAMPS board is from reprapdiscount.
LED 2 is NOT lit.
Voltage from my power supply is 11.99 and 11.96 at the RAMPS board. My PSU is rated 12V 30A.
I checked voltage at D8 and get nothing. Perhaps I'm measuring this wrong. Should I probe one of the D8 screws and put the negative probe to the ground at the PSU? (I'm such a tool and over think everything)
I checked heated bed Ω. It's good.
With the PSU unplugged and disconnected from the RAMPS board I checked Ω on both RAMPS fuses. They're good.
I checked diode (D2) and have a reading of 493 mV when I connect the negative multimeter probe to the cathode. I get 1419 mV when I reverse the probes.(the negative multimeter probe connected to anode.) I'm a newbie when it comes to digital electronics but the 1419 mV seems odd. I understand that a diode is essentially a check valve, but shouldn't the 1419mV value be lower?
I've read that it could be the MOSFET. I guess that is the next thing to check, right?
I have noticed that others have replaced the fuses with replaceable fuses. I would definitely like to do this but I'm not aware of what size/rating of fuse to get. Any help with this would also be appreciated.
I have been using my printer for several months now. I just recently printed a part that took 22 hours and then after about an hour break I printed another part that took 7 hours. During both prints everything worked just fine.
When I went to preheat for my next print I got no temp. change on the heated bed.
First, my RAMPS board is from reprapdiscount.
LED 2 is NOT lit.
Voltage from my power supply is 11.99 and 11.96 at the RAMPS board. My PSU is rated 12V 30A.
I checked voltage at D8 and get nothing. Perhaps I'm measuring this wrong. Should I probe one of the D8 screws and put the negative probe to the ground at the PSU? (I'm such a tool and over think everything)
I checked heated bed Ω. It's good.
With the PSU unplugged and disconnected from the RAMPS board I checked Ω on both RAMPS fuses. They're good.
I checked diode (D2) and have a reading of 493 mV when I connect the negative multimeter probe to the cathode. I get 1419 mV when I reverse the probes.(the negative multimeter probe connected to anode.) I'm a newbie when it comes to digital electronics but the 1419 mV seems odd. I understand that a diode is essentially a check valve, but shouldn't the 1419mV value be lower?
I've read that it could be the MOSFET. I guess that is the next thing to check, right?
I have noticed that others have replaced the fuses with replaceable fuses. I would definitely like to do this but I'm not aware of what size/rating of fuse to get. Any help with this would also be appreciated.