[Elecraft] K2 VFO / Encoder Problem

[Nigel (Nidge) Smith]

Thanks Don and Gary.

Have checked for bad joints and none found.

I've also checked for continuity between the
EncA and B to the main processor and they
are good.

The radio wasn't built by me but it had another fault
which I sorted.  Unfortunately during the first repair
process I dislodged a screw that had been dropped
between the displayboard and control board by a
previous user and I think that's what more than likely
has taken out U3.

I may have a replacement in my spares box somewhere
if not it will have to be ordered.

Now getting very late here and I have a 5am start so
will search later tomorrow.

Many thanks to you both for replying.

Regards

Nidge (G0NIG)

IO93dv
----- Original Message ----- 
From: "Don Wilhelm" <w3fpr at embarqmail.com>
To: "Nigel (Nidge) Smith" <nig_smith at o2.co.uk>
Cc: <don at w3fpr.com>; <elecraft at mailman.qth.net>
Sent: Thursday, April 08, 2010 9:52 PM
Subject: Re: [Elecraft] K2 VFO / Encoder Problem


> Nidge,
>
> Yes, from that I would surmise that U3 pin 14 is damaged - however,
> check the ENC A and ENC B lines for continuity to the microprocessor
> just to be sure there is nothing wrong there.
>
> 73,
> Don W3FPR
>
> Nigel (Nidge) Smith wrote:
>> Hi Don,
>>
>> Many thanks for the quick reply.
>>
>> So far the readings I get on U3 are as
>> follows:
>>
>> Pin 14 =  0.1V and 0.133V when the encoder is
>> rotated.
>> Pin 15 =  4.12, which varies when the encoder is
>> rotated.
>> Pin 7 =  3.4V with slight variation when the
>> encoder is rotated.
>>
>> So from the above would you say it's safe to
>> assume that U3 has a damaged output on
>> pin 14?
>>
>> Again thanks very much for taking the time
>> to reply.
>>
>> Regards
>>
>> Nidge (G0NIG)
>>
>>


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