[Elecraft] K3 button problem question

[Don Wilhelm]

Paul,

I would suggest an email to K3support at elecraft.com.  Gary or Dale can 
likely give you more information on the most likely cause of this 
behavior than anyone else.  Unfortunately, it is a weekend right now, 
and I know that both do not work on Saturday or Sunday, so wait until 
Tuesday to get a response - they have to wade through a lot of email 
that builds up over a weekend.

73,
Don W3FPR

73,
Don W3FPR

Paul Ferguson wrote:
> Seven of my front panel buttons do not function on K3 #757. I also used the 
> Switch Test to see that they give no scan codes. All other buttons work OK.
>
> Looking at the the schematic for the "Front Panel - Switches" I see these seven 
> buttons are all connected to the SCANADC0 line into U3. I took off the front 
> panel and put an ohmmeter from ground to the SCANADC0 line, and it gives a few 
> ohms. The other lines (SCANADC1-7) show as open.
>
> I looks like either U3, C30, or R27 is bad. Does anyone see any other 
> possibilities?
>
> I don't relish replacing U3 since it is a 16-pin IC. Maybe some Chip-Quik or 
> tiny cutters to snip the leads would ease the job.
>
> 73,
> Paul
> K5ESW
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