[Elecraft] K1 Intermittent power up problem

[Don Wilhelm]

Bob,

You have a bad solder connection somewhere.
I would look first at the Front Panel board.

73,
Don W3FPR

Bob VanFossen wrote:
> I have just finished my second K1.  It seems to have an intermittent and
> apparently temperature sensitive problem.
>
> Symptoms are: on power up, the yellow LED turns on and stays there.  If the
> room temp is fairly low, heating the back of the front panel (and
> consequentially the RF board) causes it to resume normal power up, and then
> everything is normal. Cooling it down does NOT cause a failure.
>
> Normal power up sequence is a quick blink of the Yellow LED, followed by a
> longer blink of the same LED then the RED Green then freq display.  On
> Failure, there is NO blink, just steady yellow.
>
> Can anyone lead me thru the power up diagnostic and just what is happening
> that SHOULD cause the Yellow led to turn off initially?  I don't even know
> where in the circuitry start!
>
> When this K1 completes it's power up, it works flawlessly!  It only fails at
> power up.  It also seems to work OK if VERY cold, or at normal room temp.
>
> HELP!!!
>
> Bob VanFossen, K4DJG
>
>
>
> For  Those Who Understand, No Explanation Is Necessary.
> For Those Who  Do Not Understand, No Explanation Is Possible.
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft    
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - http://www.avg.com 
> Version: 8.0.176 / Virus Database: 270.10.0/1866 - Release Date: 12/27/2008 8:49 PM
>
>