[Elecraft] Kx1 Z1 Encoder testing

[Don Wilhelm]

Burke,

If Q4 collector is the only point that is less than 10k, that is a 
mystery - it should connect directly to the base of Q5 and only to Q5 
base - (and therefore have the same resistance reading).  Check again 
and make certain both readings are the same.

The 9.63k ohms *may* be OK, but you should have the same reading at Q4 
collector as you have at Q5 base.

73,
Don W3FPR

Burke Jones wrote:
> 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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