[Elecraft] Field repair of blown K3 front end?

[Randy Farmer]

Excellent! Thanks to Dave, Joe and Don for the useful information. The 
K3 is now on the bench and I'll start work soon. It most likely is D5 on 
the KXV3.

Thank y'all for the quick response.

73...
Randy, W8FN

On 3/12/2016 9:43 AM, Don Wilhelm wrote:
> Randy,
>
> I suggest you contact K3support - they can likely give you a small 
> number of probable failure points.  That will allow you to choose 
> field repair or send it to Watsonville.
>
> 73,
> Don W3FPR 

On 3/12/2016 11:24 AM, Joe Subich, W4TV wrote:
>
> Randy,
>
> Is the main RX dead all the time (when using only Main RX - Sub RX
> off)?
>
> Two quick things to check ...
>
> 1) if the Main RX is dead all the time and you have KXV3/A/B boards
>    in each rig, swap them.  If the problem moves with the KXV3, the
>    problem is most likely D5.
>
> 2) If the Main RX works if the Sub RX is off and you have KRX3 in
>    in each rig, swap the SUB IN boards.  This eliminates an issue
>    with T1 (the splitter) and D1/D2 T/R switch PIN Diodes.
>
> The first thing to check is the KXV3 ... If you don't have a second
> KXV3, check the schematics for bypassing the potentially defective
> one (J66, pins 13 & 15 and pins 8 & 10).
>
> 73,
>
>    ... Joe, W4TV 


On 3/12/2016 11:32 AM, Dave Hachadorian wrote:
> Here ya go:
> http://marc.info/?l=elecraft&m=145323127930319&w=2
>
> If you have the KXV3 installed, it is probably D5.  I checked the 
> Mouser part number for the heavy-duty replacement, and it's still good.
>
>
> Dave Hachadorian, K6LL
> Yuma, AZ