SV: [sdiy] Solder won't stick to old PCB

[Graham Atkins]

This might be OK for old stock unpopulated PCB's but it's a bit  
aggressive
to start attacking the boards of your beloved OB-X, Jupiter 8.....

Graham

On 28 Sep 2009, at 01:18, Harry Bissell wrote:

> I like mechanical removal - scrape with X-acto knife or buff up with
> scotchbrite pads (or steel wool, or emery cloth (sandpaper).
>
> If they are commercial boards, they may have been wave soldered with
> an alloy containing way too much tin. (Lead is normally depleted
> first and needs to be replaced in the wave solder).
>
> I had some boards that could not be desoldered, not even with a torch.
> The fiberglass substrate burned... :^)
>
> H^) harry
>
> ----- Original Message -----
> From: thx1138 <thx1138 at earthlink.net>
> To: Ingo Debus <igg.debus at t-online.de>, Graham Atkins <gatkins at blueyonder.co.uk 
> >
> Cc: John Alex Hvidlykke <john at hvidlykke.dk>, Synth DIY <Synth-diy at dropmix.xs4all.nl 
> >
> Sent: Sun, 27 Sep 2009 16:33:52 -0400 (EDT)
> Subject: Re: SV: [sdiy] Solder won't stick to old PCB
>
> On 9/27/09 1:03 PM, "Ingo Debus" <igg.debus at t-online.de> wrote:
>
>>
>> Am 27.09.2009 um 21:03 schrieb Graham Atkins:
>>
>>> Before now with badly corroded joints I've used a mildly abrasive
>>> paste like
>>> T Cut (For car paintwork) applied on a cotton bud, but clean well
>>> afterwards.
>>
>> Interesting idea, I never tried that.
>>
>> You can also try a glass fibre pencil brush (or whatever it's  
>> called).
>>
>> Ingo
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>> Synth-diy at dropmix.xs4all.nl
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> Hi Folks,
>
> Sometimes a pink eraser on a pencil will work and is not too abrasive.
>
> Regards,
>
> Terry
>
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>
> -- 
> Harry Bissell & Nora Abdullah 4eva
>