[Elecraft] troubleshooting elecraft k1 voltage checks
E Neubauer
doublehelix454 at hotmail.com
Sat Jun 6 22:18:21 EDT 2009
Don:
Thanks so much for your help. When I recorded the erratum regarding RFC8, I marked it on pg. 31. Once the jumper was installed, everything measured perfectly. Have a great evening.
Ed
> Date: Sat, 6 Jun 2009 21:50:09 -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,
>
> 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
>>>>
>>>>
>>>>
>>
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