K2 S-Meter LED Question (Alignment and Test Part II)

[donh]

Greetings.

My other e-mail addy doesn't appear to be working, so I'll try another......

I'm at the Alignment and Test Part II of my K2 build, and everything
appears to be well with specs.

I've completed the process through the BFO Test, and have stopped at the
BFO alignment (was getting late).

However, during all of this, the rightmost LED on the S-Meter is
constantly lit.  Any clues as to what may be causing this?

Thanks

Don
W4DHH
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[Don Wilhelm-4]

Don,

I would suggest you first look for a solder bridge in the vicinity of FP
DS2 (the LED array) pin 20 and/or U4 pin17.  There are via holes on the
board between those location which are also potential places for solder
bridges.

If you find nothing in that search, then the most likely problem is that
U4 has a bad output at pin 17.  The 6B595 IC is subject to static
damage, and may have been zapped when it was mounted if good anti-static
procedures were not followed.

73,
Don W3FPR

Don Herring wrote:
>
> However, during all of this, the rightmost LED on the S-Meter is
> constantly lit.  Any clues as to what may be causing this?
>
>
>  
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[donh]

Turned out to be that I had the graph in dot mode....

Thanks

Don
W4DHH

--- On Thu, 7/1/10, Don Wilhelm <[hidden email]> wrote:

From: Don Wilhelm <[hidden email]>
Subject: Re: [Elecraft] K2 S-Meter LED Question (Alignment and Test Part II)
To: "Don Herring" <[hidden email]>
Cc: [hidden email]
Date: Thursday, July 1, 2010, 5:05 PM

Don,

I would suggest you first look for a solder bridge in the vicinity of FP DS2 (the LED array) pin 20 and/or U4 pin17.  There are via holes on the board between those location which are also potential places for solder bridges.

If you find nothing in that search, then the most likely problem is that U4 has a bad output at pin 17.  The 6B595 IC is subject to static damage, and may have been zapped when it was mounted if good anti-static procedures were not followed.

73,
Don W3FPR

Don Herring wrote:
>
> However, during all of this, the rightmost LED on the S-Meter is constantly lit.  Any clues as to what may be causing this?
>
>   
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