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

[Ron Manfredi]

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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