[Elecraft] K2 VFO Freq Display Stuck (again)

[Don Wilhelm]

Casey,

I believe we went through slowly turning the encoder shaft while looking 
at the voltage changes on the ENC A and ENC B signal lines when we were 
checking before - if not, let me know and I can give you the 
instructions and expected results.

There is another line on the front panel that could be the problem cause 
- that is /ENC RD which must go to zero to read the encoder - but it 
does that only in short negative going pulses.  You will need either a 
'scope or a logic probe to check for those pulses, they are too short to 
detect with a DMM.

Should the pulses not appear, my best guess for the cause is a bad 
output at Front Panel U3

73,
Don W3FPR

On 6/16/2012 6:50 PM, TI2/NA7U wrote:
> Yes, it's been five months or more since I posted about this problem. If you
> read through the thread Don W. surmised from a great distance that there was
> a short in the main FW chip and recommended a FW upgrade. Well, two months
> to get my hands on it, then 3 months to get my hands out from under my butt,
> ...  and I finally installed the FW upgrade today (2.04R and IOC 1.09.
>
> Yet, the problem with the encoder persists.  Haven't gone through all the
> voltage measurements again, but I'm wondering if I'm on the wrong tack?
>
> 73,
>
> Casey, TI2/NA7U
>