Thanks David!
Replaced TC9151P, same issue, injected 12 volts from external P/S to pin 19 , it`s mutes FM radio and Tape source is playing (so it`working from external P/S)
The best I can understand it`s when I press TAPE btn it`s charging C510 to 14 volts, but then I am lost , I don't understand how Q516 , Q515 is switching ?
The switching signal goes to emitter ?
This is bugging me !
Help please!
P.S. IS THIS A FLIP FLOP circuit ?