K2 problem BFO

[DL1XAS]

Hello,

 

 last year I started up building my K2, now I can go on. I arrived at the Alignment and Test Part Two.

All was fine, but when I had to do the BFO Test the qrg was not 4908 kHz, but 0000..at the TP2  :-(

also the Q2 was very hot. But I think that wasn't so the tests before, so maybe something is wrong on the RF board?

I only found D7 wasn't correct, I chnaged the sides, whereelse can i check a problem of short circuit?

 

 73 de andy, dl1xas near Hamburg

---

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[Don Wilhelm-4]

Andy,

I assume you are referring to Q2 on the Control Board.  It may be warm,
but certainly not hot to the touch.  If Q2 is hot, then something is
drawing excessive current.
Check for solder bridges on the RF board.  Particularly at those
components that connect to the 8R voltage rail.  The schematic is a tool
for identifying what is connected to 8R.  Download the pdf of the K2
manual and use the search tool to find the 8R labels in the schematic.
How much current is the K2 drawing in receive?  Normal current draw on a
completed K2 is 240 to 280 ma depending on the options.

After you have the 8R current draw to normal, then you can work on the
BFO problem.

73,
Don W3FPR

Andreas Spilker wrote:

> Hello,
>  
>  last year I started up building my K2, now I can go on. I arrived at
> the Alignment and Test Part Two.
> All was fine, but when I had to do the BFO Test the qrg was not 4908
> kHz, but 0000..at the TP2  :-(
> also the Q2 was very hot. But I think that wasn't so the tests before,
> so maybe something is wrong on the RF board?
> I only found D7 wasn't correct, I chnaged the sides, whereelse can i
> check a problem of short circuit?
>  
>  73 de andy, dl1xas near Hamburg
>
> ------------------------------------------------------------------------
> Ich verwende die kostenlose Version von SPAMfighter
> <http://www.spamfighter.com/lde>, die bisher
> 571 Spammails entfernt und mir so eine Menge Zeit gespart hat.
> Rund 5,9 Millionen Leute nutzen SPAMfighter schon
> ------------------------------------------------------------------------
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html
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