Testing points

Discussion in 'General Electronics Chat' started by tuan.le007, Nov 29, 2016.

  1. tuan.le007

    Thread Starter Member

    Nov 29, 2016
    46
    1
    Hello,

    I have this schematic.
    I know that Water Leak NOT signal and the LEAK DET signal is not working properly (from test reports).

    upload_2016-11-29_16-5-0.png

    can someone teach me how to test for this? what are my test points? PIN 30 and J1-10?
    What am I looking for? How would I know that the signal I am getting is not there?

    Your help is greatly appreciated.
    Thanks
     
  2. drc_567

    AAC Fanatic!

    Dec 29, 2008
    686
    103
    With power applied to the circuit, test the voltage at the node labeled J1-9. What is it?
    ... This test should tell you if the Leak Detector branch has the required voltage to activate the relay chip.
    ... If the voltage is low or not present, you have a power supply problem.
     
    Last edited: Nov 29, 2016
  3. tuan.le007

    Thread Starter Member

    Nov 29, 2016
    46
    1
    thank you for your help! I'll try that out and see how it goes!
    thanks again
     
  4. drc_567

    AAC Fanatic!

    Dec 29, 2008
    686
    103
    ... no problem. .. might be something else, though.
     
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