[Elecraft] Kx1 Z1 Encoder testing

[Don Wilhelm]

Burke,

Yes, you can test the encoder and its circuit to the microprocessor with 
a DMM.
Measure the voltage from the encoder pins as you slowly rotate the 
encoder shaft.  The outer two pins in the row of 3 are the ones to 
measure.  As you rotate the shaft, the voltage should jump between zero 
volts and something close to 5 volts.  If it does not go to zero, there 
is a problem with the encoder.
If the voltage does not go up to the vicinity of 5 volts, look carefully 
at RP3 and U1 pins 3 and 4.

If that does not reveal a problem, I can give you some resistance checks 
to make too.

73,
Don W3FPR

Burke Jones wrote:
> I am almost done with my KX1. During each test section I have noticed  
> that there seems to be a problem. Sometimes turning Z1 changes the  
> frequency display but sometimes when you turn it the last 2 digits on  
> the display just go back and fourth - like from 1 to 2 then 1 then 2.
>
> I have triple checked the solder connections at Z1.
>
> I am trying to figure out if I might have a faulty Z1 encoder. Can  
> anyone tell me how I could use my DMM to test directly at the "leads"  
> of the Z1?  If so which leads and what should I look for?
>
> Thanks for all your help!!
>
> Burke Jones
> N0HYD
> Http://www.n0hyd.com
>
> Sent from my iPhone
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