[Elecraft] KAF2 faulty

[Dave Sergeant]

Further investigation shows the output of U4 78L06 regulator to be down 
to 1V. So it appears the 78L06 has failed and once I have found one I 
will change it.

Thanks for the help.

73 Dave G3YMC

On 6 Dec 2014 at 15:57, Dave Sergeant wrote:

> My KAF2 has been working fine in my K2 for some years, not that I 
> actually use it that much. Today I came into the shack to find no audio
> coming out of the K2 and when I tried to change the AFIL settings it
> said 'not installed'. I cannot change the RTC menu settings either.
> 
> I have moved S1 on the KAF2 to bypass it and all is working fine so it
> seems there is a fault on the KAF2. The manual suggests this is a fault
> with the microcontroller, which of course it may well be, but are there
> any other known causes? I did think of the backup battery but not sure
> if this would cause issues outside the RTC, it measures just over 3V so
> a bit down.
> 


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