[Elecraft] Kx1 Z1 Encoder testing

[Burke Jones]

Another thing I meant to tell you in the las email. Unrelated to z1.

I did the resistance checks on page 54. All checks out good except for  
Q4 Collector. I am getting 9.63k instead of >10k. Is this a problem?   
If so where should I look.

Burke Jones
Sent from my iPhone

On Mar 14, 2009, at 7:37 PM, Don Wilhelm <w3fpr at embarqmail.com> wrote:

> 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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