[Elecraft] K3S stuck on MCU LD - solved

[Don Pomplun]

Yup, Everything unplugged from K3S including antennas, and even the 
mic.  When it was plugged into the PC's USB port, it would beep and 
Device Manager screen would refresh and add a COM port.  I received a 
few direct emails with suggestions.  I called CS and was waiting for a 
return call, figuring it was RMA time.  Mid afternoon an email from Don 
Wilhelm suggested connecting the K3S via its RS232 port rather than its 
USB, using the appropriate adapters. Worked on the first try!  It also 
appears that the rig's USB port is OK since it communicates with N1MM+ 
OK.  Case solved, though it's still not apparent what the
problem was.  TNX to all.