[Elecraft] K3S stuck on MCU LD

[Don Wilhelm]

Don,

That state (MCU LD and red TX light blinking) is typical when some 
glitch occurs between the computer and the K3/K3S during a firmware load.

Turn the manual (or read the K3 Utility Help) section on "Force a 
Firmware Download".  Follow those steps and you should find success.

If the original error is still present contact Elecraft support.

73,
Don W3FPR

On 11/14/2019 9:57 AM, Don Pomplun wrote:
> A few days ago I noticed that when I powered up my K3S (ser #11141) I 
> would briefly get an Err DSE message.  The manual says I should reload 
> the firmware via the K3 Utility program (like I've successfully done in 
> the past when a new version is available). But this time when I click 
> Send All Firmware to K3, I get this:
> 
> Elecraft K3 Utility Revision 1.16.7.25
> OS Version 6.1 Build 7601 Windows 7
> K3 MCU revision ??.??. RS-232 speed 38400 bit/s.
> Sending firmware file C:\Users\K2BIO\AppData\Roaming\Elecraft\K3 
> Firmware\hmcu0567.hex to MCU
> /(5-10 second pause, then)/
> Error code 0xE2000048: No response to poll while synchronizing to buffer 
> boundary
> MCU verification failed. Reload MCU.
> Click "Close" to close this window
> 
> I disconnected the Power Pole connector for a few minutes, then powered 
> it up again.  After the front panel LEDs flash briefly, the screen says 
> MCU LD and the red TX light is flashing. Trying this again many times, I 
> get the same message.
> Then I noticed that with _no power to the K3S and the USB cable between 
> the K3S and the PC unplugged_ at both ends, when I start the K3 Utility, 
> and click /Send All Firmware to K3/, I get exactly the same error 
> message as noted earlier (with nothing connected).  Thinking maybe the 
> problem is with the K3 Utility, I deleted it from the PC and reloaded it 
> from the Elecraft site and reinstalled it.  Same problem!
> It appears that even after a long power-down, the K3 processor isn't 
> resetting.  Looking for suggestions!
> TIA
> Don    K2BIO
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