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Hello Friend. if it has audio at the headphone output, the jack is oxidized inside you can change it or you tap it on the pins of the center of the jack or you take it out and carefully check it in there it has a swish that is that it closes and opens when the terminal enters of the hearing aid. I hope it was good for you. Cheers
check voltage vcc on pin 4
pin 7 voltage
try applying signal on pins 8 and 10
if there is voltage on pins 4 and 7, then when applying signal it does not amplify
check the headphone jack
which is in the big circle .... if it's ok
the integrated one is already