No it is NOT a bad Pot, what is happening is that with the Squelch "Open" The "Trigger" for that circuit, is getting "Swamped" by signal, and is shorting out, the MCU, senses this and tells the Power Supply it is drawing too much current, and shuts it down. You will need to troubleshoot this area. It may be a very difficult to find. First you need a service manual. www.midlandradio.com/Resource_/Product/787/.../75-785.pdf Above is a USER manual.
Answers & Comments
No it is NOT a bad Pot, what is happening is that with the Squelch "Open" The "Trigger" for that circuit, is getting "Swamped" by signal, and is shorting out, the MCU, senses this and tells the Power Supply it is drawing too much current, and shuts it down. You will need to troubleshoot this area. It may be a very difficult to find. First you need a service manual.
www.midlandradio.com/Resource_/Product/787/.../75-785.pdf
Above is a USER manual.