[Elecraft] K3 - MCU/FPF/DSP1 Firmware Update Failure

[Don Wilhelm]

Ken,

Actually, since you have the P3 in place too, there are 5 possible 
points of failure instead of 3.  To what I mentioned before, add the P3 
RS-232 'thru' path, and the RS-232 cable between the P3 and the K3.

Eliminate the P3 and the P3 to K3 cable by connecting the RS-232 cable 
directly to the K3.

73,
Don W3FPR

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Ken,

Since the K3 is "doing its thing" normally, try another USB to serial 
adapter, or another computer.
There are 3 possible things that could be at fault - the computer, the 
USB to serial adapter, or the K3 RS-232 interface.
Do what you can to reduce the possible points of failure down to one.

73,
Don W3FPR

On 3/29/2015 9:30 AM, K M Dailey wrote:
> Hi Ross,
>
> Yup, tried that - powered the K3 off, waited 30 secs, powered on and held the Power button down until the red TX light comes on and MCU LD appears - still no comms to the iMac.
>
>