K3: component location on circuit diagram
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K3: component location on circuit diagram
 
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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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Re: K3: component location on circuit diagram
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Administrator
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Far left side of the RF board (top, not bottom). They're leaded caps
about 1/2" in diameter. Blue, as I recall :) 73, Wayne N6KR David Lankshear wrote: > 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! --- http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by DaveL G3TJP
Assuming you're viewing the electronic version of the
schematics with Adobe Reader the Search function is most helpful. Enter C2 in
the Search field and then from the drop down box select "Whole Words Only" which
prevents the search stopping on C214, C259 etc. In a matter of seconds "C2" was
located as a 470 ufd cap. in the upper right-hand corner of Sheet 1 of 4 for the
K3 RF board (Oct. version of the schematics) and C3 is
adjacent.
Best of the holidays to you and yours.
73/Patrick
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RE: K3: component location on circuit diagram
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In reply to this post by DaveL G3TJP
Thanks Wayne and Patrick. I was working with
a set of printed diagrams and Patrick, you pointed me straight at
it!
I still can't believe how I could have missed the
top R/H corner of RF board diagram 1, but it will be well into Christmas day
before I'll be able to sneak away into the shack to check to see if my printed
diagram contains that information.
I knew where the components were physically
located, but couldn't find them on the circuit diagram (map).
As is said in the UK, "I should have gone to
Specsavers" HI!
Your help much appreciated. Christmas will be
that much better for your help.
73 all. DaveL
G3TJP
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Re: K3: component location on circuit diagram
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In reply to this post by DaveL G3TJP
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. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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