[time-nuts] I love the smell of tantalum in the morning

Scott Stobbe scott.j.stobbe at gmail.com
Sat Nov 5 22:00:08 EDT 2016


For through hole parts sure, but I would not recommend that on SMD parts,
the copper foil of a little pad is pretty easy to tear off and it's a royal
pain if you have to mount a device missing some of its landing pads.

On Sat, Nov 5, 2016 at 4:37 PM, Tom Miller <tmiller11147 at verizon.net> wrote:

> I usually nibble away at the center of the part until it is two separate
> pieces. Then unsolder each piece. Clean the pads off with wick then install
> the new part.
>
> Use a good sharp pair of flush cut side cutters.
>
> Tom
>
>
> ----- Original Message ----- From: "Bob Camp" <kb8tq at n1k.org>
> To: "Tom Van Baak" <tvb at leapsecond.com>; "Discussion of precise time and
> frequency measurement" <time-nuts at febo.com>
> Sent: Saturday, November 05, 2016 4:24 PM
> Subject: Re: [time-nuts] I love the smell of tantalum in the morning
>
>
> Hi
>>
>> A *lot* depends on how many planes there are in that board. The weight of
>> he copper
>> also maters a bit. If there is enough thermal mass, you will need a
>> pre-heat process.
>> There are lots of ways to do it ranging from the kitchen oven to various
>> “frame and
>> lightbulb” setups and on into ever more complex heating approaches.
>>
>> If the hot tweezers / soldering iron / hot air tool does not reflow the
>> solder quickly (10 seconds
>> or less) stop. Get a pre-heat setup and try again. With proper heat you
>> should have the part
>> off in under 4 seconds. People don’t tend to use stopwatches when
>> soldering. 4 seconds is quite
>> a while on a joint. Ten seconds is pretty much forever ….
>>
>> Bob
>>
>> On Nov 5, 2016, at 3:12 PM, Tom Van Baak <tvb at LeapSecond.com> wrote:
>>>
>>> See C13 in the attached photo. I need to replace some blown caps on a
>>> few boards [1]. In one instance the cap got so hot it melted itself off the
>>> board. Quiet convenient, actually -- it acts like its own fuse -- but I
>>> don't think the 5071 designers had that clever feature in mind.
>>>
>>> Having not done SMT before, how should I do it with minimal risk to the
>>> very precious PCB. Or, what equipment should I use this as a good excuse to
>>> buy?
>>>
>>> Thanks,
>>> /tvb
>>>
>>> [0] http://www.imdb.com/title/tt0078788/quotes
>>> [1] http://leapsecond.com/museum/hp5071a/A1-mother.htm
>>> <A1-mother-6.jpg>_______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
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>>> and follow the instructions there.
>>>
>>
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