K2 glitch finally found!

[John Wiener]

Gary Surrency must be the most patient person on the earth.  He just  
emailed me twice within 1/2 hour of my questions.

I can now report that I HAVE LCD READOUT!

I had to replace all electrolytics on the Control Board to find my  
error.  I found that I soldered C45 (on the bottom of the board)  
across pads of U6 instead of U8.  I missed it on several rechecks  
because it was new and not listed on parts placement diagrams in the  
back of the manual.

I want to thank everyone who has helped me so far...Don Wilhelm comes  
to mind.

Also, thanks to N0SS for pix of circuit boards.

Now, I have a question (of course).
My first resolder job was C13 on Control Board was, naturally, the  
worst.  On replacing the cap, I note that the pad is damaged on the  
negative lead.  I soldered over to an undamaged part (I hope  
successfully).

My question: is the negative lead supposed to be directly to ground?  
(perhaps soldered on the top of the board)  I get about a meg of  
resistance between the lead and ground.
Is this a problem?

Now to build the RF probe.

By the way, I am now a ham again ... after a hiatus of over 30  
years.  I just passed levels 1 thru 4 in one sitting over the weekend.
I didn't expect to pass the Extra but I studied like hell.  The ARRL  
books are fantastic.  Couldn't have done it w/o them.

So, I'll be able to use a new call sign within a few weeks!

John
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[Don Wilhelm-3]

John,
Yes, 1 megohm of resistance to ground for the negative side of Ctrl Bd C13
is a problem, and yes it should be connected to ground.  If you have damaged
the through-plated hole during your removal techniques, you should connect
the lead to ground somewhere on the back of the Control Board - adding a
wire to the center leg of the 8 volt regulator would be a good way to do
it - because soldering the capacitor on the component side of the board
would be most difficult - that capacitor will be responding to lower
frequency noise rather than HF, so a moderate length added wire should work
just fine.

73,
Don W3FPR

> -----Original Message-----
> ...
> Now, I have a question (of course).
> My first resolder job was C13 on Control Board was, naturally, the
> worst.  On replacing the cap, I note that the pad is damaged on the
> negative lead.  I soldered over to an undamaged part (I hope
> successfully).
>
> My question: is the negative lead supposed to be directly to ground?
> (perhaps soldered on the top of the board)  I get about a meg of
> resistance between the lead and ground.
> Is this a problem?
> ...
>

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[Chris Kantarjiev K6DBG]

> Gary Surrency must be the most patient person on the earth.

I'll second that. He and I have been going back and forth about the
low audio problem with s/n 3641 for a month now. He's helped me find
a bad cap in the AGC circuit, some questionable stuff in the BFO, and
we're narrowing down a problem in the AF amp.

I'm about to give in, though. I'm more interested in getting on the
air than fixing this myself...

Thanks, Gary.

73 de chris K6DBG
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