just wondering if there are many people out there that have experienced this type of noise usually a solenoid like pre charge or pocket down on smtc but it can be any solenoid. the hfo usually comes in measures the voltage at the coil and finds that you need an io board because there is voltage going to the coil when there should not be. well i figured out what is going on and this can be resolved with a small component called a triac. these usually fail closed which means they allow current to pass thus voltage at the coil of whatever solenoid is being powered. i was able to replace the triac and get the machine running normally within an hour. saving the customer the cost of an io board $800.00 or more and the labor to install it. this is very helpful information if anyone needs it.
thanks

Similar Threads: