[Elecraft] VCO Alignment

[Hank Kryger]

Hi
Had a similar problem. Building K2 5669,  check U4 carefully, cold 
solder joints etc.  Check your Q in the center front of the board.  I 
am not at my hamshack but will look tomorrow which Q could be the 
problem.  In my case it was U4. good luck  Hank WA9QJH

On 24, Sep 2006, at 19:49, Jim Brassell wrote:

> Hello.
>
> I am building K2 #5731 and I have run into two problems.  The first, 
> and most serious, is in VCO alignment.  When moving L30, the voltage 
> at the left end of R30 does not change from 8.03vdc.  I have been 
> through the entire range of L30, very carefully, with no change.  I 
> pulled out T5 and rewound it.  It is as nearly perfect as I can get 
> it.  When I measure vdc on T5, I see approximately 0.01vdc on 1 and 2 
> and 2.65 on 3 and 4.  I checked voltages on U4 and U6 and they are in 
> the range of the table in the back of the manual.  I've checked all 
> the components installed and the soldering.  This is my second K2 and 
> I have been a lot more careful.  I'm stumped.  Anybody got any ideas.
>
> The second thing is that parts of the mode indicator on the display 
> have become intermittent.  Any ideas on that?
>
> Thanks.
>
> Jim, K4ZMV
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