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

[Harry Bissell]

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
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
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