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KAF2 faulty

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g3ymc

KAF2 faulty

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.

73 Dave G3YMC

http://davesergeant.com

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g3ymc

Re: KAF2 faulty

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.
>

http://davesergeant.com

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g3ymc

Re: KAF2 faulty

And to confirm that replacing U4 78L06 got the KAF2 working again. A
mystery why it failed though...

73 Dave G3YMC

On 8 Dec 2014 at 10:56, Dave Sergeant wrote:

> 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.
> >
>