Potrail2378 Posted February 8 Share Posted February 8 Hi guys, hope you're all well. I have what I think is a faulty decoder, and am worried that it may be only fit for the bin. So my decoder voltages are as follows - OFF/ONPurple wire - 0v/16vGreen wire - 18v/16vWhite wire - 31v/18vYellow wire - 6v/30vAll motor functions are OK and it runs well. Is the decoder salvageable? Thanks in advance 👍 Link to comment Share on other sites More sharing options...
Fishmanoz Posted February 8 Share Posted February 8 Those voltages certainly don’t make sense. What is your reference for those voltages? You should be measuring v the blue common positive. What load are you putting across the output, remembering your multimeter is effectively open circuit? Link to comment Share on other sites More sharing options...
Potrail2378 Posted February 8 Author Share Posted February 8 Hi, I'm using the blue wire as +tive and there is no load. Just the red multimeter lead on the blue +tive and the black wire of the multimeter (separately) onto the purple, green, white, and yellow wires. I have just replaced the decoder and everything is working fine now, but the original decoder is still giving the strange readings. Link to comment Share on other sites More sharing options...
Fishmanoz Posted February 8 Share Posted February 8 Try them with a 1k or 2k resistor across them and see what you get. Link to comment Share on other sites More sharing options...
96RAF Posted February 9 Share Posted February 9 If you overcurrent the function outputs of most decoders you will damage them as usually there is no self protection as there is on the motor control circuits. Current needs to be less than 100mA on load. Link to comment Share on other sites More sharing options...
Fishmanoz Posted February 9 Share Posted February 9 Hence a 1k resistor giving you 12mA at a nominal 12V. Link to comment Share on other sites More sharing options...
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