[Elecraft] KX1 appears dead after KXB3080 PCB installed... ...Help please!

[Don Wilhelm]

Shawn,

Yes - the NE612 is quite a hardy device.  Try removing Q9 from the board 
and see if the voltage at U5 pins 1 and 2 go up to the vicinity of 1.4 
volts.  If, no, then remove C8 and measure again - if still not 1.4 
volts, replace U5 - or look for the solder bidge that is shorting the 
product detector input.

73,
Don W3FPR

Shawn Morrow wrote:
> Thanks Don.
>
> At one point I actually reseated U1 just to be sure so I think I'm good
> there.
>
> Checked out U5 as you suggested.  Here is what I found:
>
>   Pin  Spec  Meas     Pin  Spec  Meas
>    1   1.39    0 <<    5   4.44   5.8 <<
>    2   1.39    0 <<    6   5.57   5.7
>    3     0     0       7   4.96   5.2
>    4   4.44  5.8 <<    8   5.62   5.8
>
> So this sort of implies that U5 is shot as well, no??  Do these readings
> suggest any thing else I should check into??  (These results also got me
> looking downstream from pins 14 and 22 on U1 that also read abnormal.)
>
> I am guessing I should request a new U5 too?
>
> Any other insights??
>
> Thanks for all the help.  It is appreciated.
>
> Regards,
> 	Shawn Morrow
> 	   W4SDM
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com 
> Version: 8.0.233 / Virus Database: 270.10.17/1934 - Release Date: 02/02/09 07:51:00
>
>