[Elecraft] K3 button problem question

[Bob Cunnings]

Yep,  according to the schematic, these are all associated with the
SCANADC1 line. SPOT is also on that line, do you have trouble with
that button?

A while back I had  trouble with some of the buttons on the SCANACD3
line in K3 #495 - Width and AFX in particular, but after a few days
the problem went away suddenly - I have no idea why.

Bob NW8L

On Sat, Apr 17, 2010 at 11:55 PM, Dave Hachadorian <k6ll at arrl.net> wrote:
> Interesting. I also have several buttons that don't work on my
> K3:
> band up
> mode up
> ant
> shift/lo/norm
> rate/lock
> NR
>
> The radio is still usable, and I'm waiting for a break in the
> contests to send it in for repair.
>
> Dave Hachadorian, K6LL
> Yuma, AZ
>
>
> --------------------------------------------------
> From: "Paul Ferguson" <Paul at PaulFerguson.us>
> Sent: Saturday, April 17, 2010 7:28 PM
> To: <elecraft at mailman.qth.net>
> Subject: [Elecraft] K3 button problem question
>
>> 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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