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A good news and a bad news, I replaced some resistors, and now the output of pin 40 has reached 16.3V, which is the normal range. You can still hear a little noise when connected to the amplifier, but it has been greatly improved, but the process of replacing the resistors I accidentally broke the white pin of the selector , it should be in the third blue area, but I soldered it in the second red area, and then I found that there was no signal when I connected the guitar to play, and there was no signal from the instrument and microphone, including the PA, so I changed it Completed the third blue zone and still no signal, do you have any suggestions for this?

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