I agree... Don is amazing! I look for his comments even if I don't have any
issues. Hats off to Don!!
73,
Bill
K9YEQ
K2 #35; KX1 #35; K3 #1744; mini mods
ATS-3B
-----Original Message-----
Subject: Re: [Elecraft] K1 with Issues
I read Chuck's description of his problem, and I thought, "What in the
world?"
Don Wilhelm deserves a round of applause for this diagnosis.
Peter N8MHD
On 4/16/09, cstove...@aol.com <cstove...@aol.com> wrote:
>
>
> Hi Don,
>
> Your comment about using flux cleaner struck a nerve with me.? I didn't
>
> Measure the voltage at pins 4 and 5 of RF Board RP5 and compare with the
> voltage at Front Panel U1 pin 5. They should be the very close to the
> same voltage. If not, check the values of R19 and R20 and re-flow the
> soldering of RP5, R19 and R20.?
> ?
>
> If you had ever attempted to clean the flux from your K1, that could be
> the cause. If some flux cleaner residue wicked up under the key jack,
> it can create a leakage path which would explain your problem. The only
> cure is to remove the key jack and clean both the board area under the
> jack and the bottom of the key jack.?
> ?
>
> It is conceivable that the key jack itself could have some kind of
> leakage path inside. To check, you will have to remove the key jack and
> replace it if necessary.?
> ?
>
> Do the solder re-flow first - a bad connection can work fine for a
> while, and then fail later after a bit of oxidation occurs. If that
> does not cure it, remove the key jack and check again with the jack
> out. Replace the key jack if required.?
> ?
>
> 73,?
>
> Don W3FPR?
> ?
>
> cstove...@aol.com wrote:?
>
> > My K1 (sn2450) went together back in Oct 07 without a hitch and has been
> working flawlessly ever since.?
>
> >?
>
> > A big glitch showed up tonight.? When I pushed the attenuator button it
> started transmitting dashes.? That cleared by cycling the power.? I then
> tried sending the content of memory 1.? It began sending that message,
> stopped, "end" appeared in the display, then started transmitting
> alternating dots and dashes.? When locked in transmit, the display blanks
> out.? Initially I verified that it was transmitting with another receiver,
> but now it seems to have lost output too.? It was hooked up to a resonant
> antenna or dummy load, so I wouldn't think the final fried.? I'm running
it
> off a supply at 13.6VDC.?
> >?
>
> > A voltage check of RA3 pin 5 of the MCU shows 5.6V with both dot and
dash
> contacts open.? When the WPM-/attn button is held the dashes start sending
> and the pin 5 voltage drops to 5.0 even? though the contacts are still
> open.?
>
> >?
>
> > I've been awake too long and not much is making sense, so I'm going to
> call it a night.? Any ideas or suggestions on where to look would be
greatly
> appreciated.?
>
> >?
>
> > Chuck? K4QS
> > ______________________________________________________________?
>
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>
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>
> >
>
>
>
>
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