[Elecraft] K3: component location on circuit diagram

[Tom Hammond]

Dave:

Just did that mod two days ago.

Here's what I did.... if I can recall clearly.

1) download and view the set of K3 schematics... specifically the one
    labeled "KIO3 AUDIO I/O BOARD", page #12 of 43 in the K3 schematic
    file set.

2) You'll be looking for the lines coming from J8 (Spkr), and specifically
    lines labeled SKP_L, SKP_R. Following  these lines all the way to the
    left of the schematic, you'll find that they connect to pins 1 and 4
    of the 16-pin header connector.

3) You'll also want to identify a grounded pin on the header connector.
    I chose pin #10 (MIC C)ommon, since it was directly 'wired' via a
    hard-wired line back to the ground foil.

4) Now, take your first resistor, lay it against the PC board and bend
    (and trim) its leads such that they will lay against pins 4 and 10
    of the 16-pin header connector. Solder into place.

5) Lay the 2nd resistor up against the first and bend/trim its leads to
    connect to pins 1 and 10. Solder.

Done

73,

Tom Hammond   N0SS


At 18:18 12/24/2008, you wrote:
>Happy Christmas, all.
>
>What better time than the final hours of Christmas Eve to apply the 
>mod, recently described by Wayne, that prevents damage to the audio 
>output chip if a mono jack is inadvertently plugged into ext. sp. 
>instead of a stereo jack?
>
>Before commencing, I decided to locate C2 and C3, the two 470uF AF 
>output coupling capacitors on the circuit diagram - and that's where 
>I came off the rails.  I can't find them!  I know they are 
>physically on the main RF board and sit between the AF amp on the 
>DSP board and the KIO3, but scrutinising the maps has taken up a 
>couple of hours, and I've become obsessed with finding them.
>
>Can anyone please help put me out of my misery?.......pass the bottle, please!
>
>Season's Greetings to all and TIA.
>
>Dave L  G3TJP
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