[Elecraft] K2 BFO Test fails

[Don Wilhelm]

  Benny,

Well, if all that is OK, then it should work unless there is a problem 
with Q24.  Check the value of C169 as well as C173 and C174.

It is particularly worrysome that you are seeing something around 8 MHz 
at pin 6 of U11.  Please tell us how you are measuring that frequency 
('scope or frequency counter).

If indeed you are getting an 8 MHz signal, you may have bad crystals at 
X3 and X4, but that would be quite unusual.
There is not an easy method of checking the crystals.

You may want to beg parts(at) elecraft(dot)com for replacement BFO 
crystals and a replacement L33.

Please include your name on all posts to this reflector.

73,
Don W3FPR

On 12/3/2010 7:03 PM, kruegerbenny wrote:
> crystal values checked ->  ok
> continuity of L33 checked ->  ok
> D37 is correctly installed
> and I resoldered all pins of RP6
>
> any other ideas?
>
> (how can I check if the crystals are ok?)
>