Hello,

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



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

 

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.

 

thank you for your help! I'll try that out and see how it goes!
thanks again

 

... no problem. .. might be something else, though.