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  1. 04-20-2014, 01:43 AM #1
    BikeRide
    BikeRide is offline
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    Heatbed output has no voltage

    Hello, i'm trying to wire my heatbed to RAMPS 1.4 to D8 port, but i have problem. That heatbed heats all the time, if i turn off heating, heatbed heats, if i turn on heating, heatbed still heats. Anyone know how to fix it?
    thanks
    Last edited by BikeRide; 04-20-2014 at 02:53 AM. Reason: problem solved, another problem
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  2. 04-25-2014, 03:16 PM #2
    Black Rabbit
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    Quote Originally Posted by BikeRide View Post
    Hello, i'm trying to wire my heatbed to RAMPS 1.4 to D8 port, but i have problem. That heatbed heats all the time, if i turn off heating, heatbed heats, if i turn on heating, heatbed still heats. Anyone know how to fix it?
    thanks
    I could think of a few possibilities: Software problem: somehow your command does not reach the printer (try another program to make sure). Hardware: this is most likely. Your cable connection (USB) doesn't work properly. Try another cable. It could also be a RAMPS problem; mosfet could be bad. Could also be related to your firmware you have in the arduino.
    To be more specific you'll need to come up with more info. I wish you luck!
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  3. 04-25-2014, 06:24 PM #3
    old man emu
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    Check mosfet Q3 to see if it is OK
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