Display MorePerhaps it will be useful for you.
I myself solved the problem. I had to disassemble the entire processor.
A button is simply a mechanism that presses a another button through the spring on the chip itself. There is nothing electric about it.
I found that the microcircuit is not tightly fixed and each time you press the "1" button, it is rejected. I tightened all the bolts harder. At this point, the problem is resolved.
But still, the chip deviates slightly each time you press "1". This does not give the impression of reliability.
I don’t know why the edges of the chips are not fixed, but this is definitely a design flaw
I saw that you solved the problem. I have the same problem with the tuner switch. But I'm afraid of opening and ruining the Stage. = /