Page 47 = https://ftp.elecraft.com/K3S/Manuals%20Downloads/K3S%20Owner's%20man%20A1.pdf
K3S Firmware Self-Test If the K3S detects an error in its firmware (an incorrect checksum), it will flash the TX LED and show MCU LD on the LCD (with backlight off). If this occurs, connect the K3S to your computer and reload firmware. While firmware is loading, the Delta-F LED (∆f) will flash. When the download is complete, the K3S should reset and run normally. Forcing a Firmware Download If you accidentally load an old or incompatible firmware version and find the K3S unresponsive, do the following: (1) unplug the K3S from the power supply and wait 5 seconds; (2) plug the power supply back in; (3) hold the transceiver’s POWER switch in; after about 10 seconds, you’ll see the TX LED flash (you’ll also see MCU LD on the LCD); (4) load the correct firmware version. Good Luck!! Kyle, WA4PGM On Sun, Apr 3, 2022 at 2:25 PM Don Wilhelm <[email protected]> wrote: > Go to the manual and look up how to recover from that condition (Forcing > a firmware download). > It on page 42 of my old manual under Firmware Updates, the page may have > changed in newer manuals. > It is easy to do and does not have to go to a repair facility. > > 73, > Don W3FPR > > On 4/3/2022 1:37 PM, hp via Elecraft wrote: > > Here is one line from an EA6 message about a K3 he just purchased . > > > > Elecraft K3 is stuck at MCU LD and need to be sent to Italy to Elecraft > Official Service to recover it. > > > > Are there any tricks to recover without sending it to a service site ?? > > > > I have told him how to subscribe to the reflector and gave him a link to > the archives > > but maybe someone has a quick answer which I can forward to him . > > > > Hank K7HP > > > > > > > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[email protected] > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to [email protected] > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
