[Elecraft] K3 Problem: Blank display Won't turn OFF

Need help with my K3 S/N 280. While loading new firmware into the KPA500, something happened to my K3. The firmware load to the KPA500 appears to have succeeded, but now the K3 is ON with a blank display, the K3 won’t turn OFF and the K3 Utility says that “COM3 is being used by another

Re: [Elecraft] K3 Problem: Blank display Won't turn OFF

Roger, Do you have a KAT500? It must be ON before booting the K3. Does it say MCU LD on the display (may be unlit, use a flashlight)? Then reload the firmware. The COM3 busy may (probably does) require a reboot of the computer. Try disconnecting the serial port. Since the computer hung

Re: [Elecraft] K3 Problem: Blank display Won't turn OFF

To put your K3 back into a usable state: 0. Kill the KPA500 utility program. This should leave your COM3 free for the K3 utility. If it doesn't then reboot the computer. 1. Remove the K3 power and leave it disconnected for 15 seconds or so. 2. Re-connect K3 power and hold the K3's power