Symptoms of Ground Loop Damage

Select Language

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

This may affect one or more inputs changing state for no apparent reason.
Start with a visual inspection of the main board for signs of damage.
Testing this may require the use of test equipment to test the input signal, replacement of an input source and the investigation of it's associated wiring.
Please be aware that electrical noise as well as ground loops can cause similar symptoms.

One or more USB ports on MASSO stop working.
Plug a known good USB flash drive into the affected port and see if MASSO can read it. If possible test the flash drive on a working port on MASSO to ensure that MASSO can read it.
If the Flash drive does not work you can test the USB port to see if it is outputting 5 volts by plugging a USB cable between the port on MASSO and your phone. If the Phone starts charging them MASSO is supplying 5 volts.
If you do not get 5 volts on the MASSO USB port you may have ground loop damage.
Start with a visual inspection of the main board for signs of damage.