[Elecraft] troubleshooting elecraft k1 voltage checks

[Don Wilhelm]

Ed,

Go through the checks that I have indicated anyway and let us know how 
far down the list you get without the voltage going to zero.  When you 
have found where it goes to zero, that is the failure point.

73,
Don W3FPR

E Neubauer wrote:
> Woops.  Sorry.  I meant to say I got the correct voltage for pin 16.  All others in the chart are at <.1 V. ================
>
>   
>> Date: Sat, 6 Jun 2009 21:24:44 -0400
>> From: w3fpr at embarqmail.com
>> To: doublehelix454 at hotmail.com
>> CC: elecraft at mailman.qth.net
>> Subject: Re: [Elecraft] troubleshooting elecraft k1 voltage checks
>>
>> Ed,
>>
>> I am not certain how you have 5.8-6.2 volts at P1 pin 15 and zero volts 
>> at P1 pin 16.
>>
>> The number of components you have installed at this point is not large, 
>> so I suggest you trace the voltage from the input.  Check the following 
>> points in order (stop when you find one that is substantially lower than 
>> I indicate because further checking is futile).  I will assume a 12 volt 
>> power source for the initial readings so adjust anything that I have 
>> indicated 12 volts as expected for your actual supply voltage.
>> It may be helpful for you to follow along in the schematic to see "what 
>> is connected to which".
>>
>> The center of the coaxial power jack (J4) - expect 12 volts
>> The anode of D16 - expect 12 volts
>> The cathode of D16 - expect 12volts minus 0.3 volts
>> Both ends of the RFC8 position on the bottom of the board (RFC8 is a 
>> jumper at this point) - expect 12v minus 0.3v.
>> The "IN" pin of U5 - expect 12v minus 0.3 volts
>> The "OUT" pin of U5 - expect 7.5 to 8.5 volts
>> The "IN" pin of U6 - Expect same as above
>> The "OUT" pin of U6 - expect 5.8 to 6.2 volts.
>>
>> If all those are correct (these are the voltage sources), check the 
>> soldering at the U6 "OUT" pin and U3 pin 6, and check the soldering at 
>> P1 pin 16.
>>
>> 73,
>> Don W3FPR
>>
>>
>> E Neubauer wrote:
>>     
>>> Hello:
>>> I am in the midst of building the rf board for the K1.  All went well until page 30 in the manual.  
>>> I performed the voltage checks and the only one that works is the one at p1 pin 15.  The others read "zero" on my DMM.  I rechecked all soldering - no solder bridges or cold joints.  I went back to the beginning of the rf board assembly and double checked every component's installation and orientation - all fine.
>>>
>>> Has anyone got suggestions about where to start to diagnose the problem?   Thanks very much.
>>> Ed
>>>   
>>>
>>>       
>