Symptoms of Ground Loop Damage
Inputs stop working
- This would normally affect multiple inputs rather than a single input.
- If a visual inspection of the board does not show damaged components you may just have a faulty optocoupler.
- Tests can be done by using the standard optocoupler test procedure for you particular controller type as per the links below.
- Testing MASSO G3 and MASSO G3 Touch optocouplers
- Testing MASSO G2 Optocouplers