[Elecraft] [K2] No signal at TP1 during Alignment and Test Part 2

[Robert Forster]

Well it was T5!  Sorry to take so long to get back but free time has been
short lately.  Lead 4 of the transformer was poorly stripped as expected.
I also think I need to run a little more heat when I'm soldering from this
point forward to make sure i get good connections made.  Thank you to
everyone who responded.  After I finish my happy dance I think I'll go make
a cocktail!

73,
Robert
AD0TA

On Fri, Jun 9, 2017 at 8:48 AM, Ron Manfredi <wa2eio at optonline.net> wrote:

> I agree with Don's comments on the soldering.
>
> I am not familiar with the kit, but if you had to wind the torroid
> yourself,  were you sure to remove ALL the insulation from the wire ends
> before soldering them to the board?
>
>
> 73,
>
> Ron   WA2EIO
>
>
>
>
> On 6/9/2017 10:41 AM, Don Wilhelm wrote:
>
>> Robert,
>>
>> I just now had time to look at your photos.  It seems to me that your
>> solder on T5 (and maybe elsewhere) looks like "balls" with convex sides.
>> That is indicitive of a solder connection that has not received enough heat.
>> A good solder connection should have a slight fillet and end up with
>> obvious solder that has flowed out entirely onto the solder pad and also up
>> onto the leads.  The edges of the solder should taper out to an almost
>> invisible edge with a concave fillet of solder between the pad and the lead.
>> See the diagrams in the Soldering Tutorial available at the Elecraft
>> website (you may have to search for it).
>>
>> I suggest you remove the solder from any connection that looks like those
>> and re-do them.  Do not apply so much solder to "pile it on" - that does no
>> good.  Heat the solder pad and lead until you can see the solder flow out
>> onto both.
>>
>> Using a small gauge solder helps.  With large diameter solder, by the
>> time you apply 'a little bit', that is already too much.  Save the large
>> solder for antenna wires.
>>
>> 73,
>> Don W3FPR
>>
>> On 6/8/2017 10:20 PM, Robert Forster wrote:
>>
>>>
>>> This should lead me to suspect T5 correct?
>>> the soldering on the underside of the board for T5 looks ok (no ring for
>>> these points but the topside of the board looks rough! I used the USB
>>> microscope and took some photos.
>>> Here: https://flic.kr/s/aHsm2aNdeG
>>>
>>>
>>>
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>>
>


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