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

[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.

Graham

On 27 Sep 2009, at 16:07, John Alex Hvidlykke wrote:

> Ah, the beauty of old electronics ;-)
>
> I have similar problems with most of my component collection, as  
> most of
> them have been in storage in my various attics and cellars for some 20
> years.
>
> I will try if alcohol helps (on the soldering, that is). It sounds  
> much
> easier than scraping the qxidation off with a hobby knife like I  
> have been
> doing until now.
>
> \John
>
>> -----Oprindelig meddelelse-----
>> Fra: synth-diy-bounces at dropmix.xs4all.nl
>> [mailto:synth-diy-bounces at dropmix.xs4all.nl]På vegne af cs e
>> Sendt: 27. september 2009 02:53
>> Til: synth-diy
>> Emne: Re: [sdiy] Solder won't stick to old PCB
>>
>>
>> Thanks guys...I think that the joints are oxidized.  I'm not using
>> lead-free solder (I went and bought a boatload once I heard of ROHS a
>> few years ago) - and I'm sure my iron is hot enough.
>>
>> I'll clean it off with alcohol and try some flux...for now I got the
>> crucial part to stick.
>>
>> On 9/26/09, Graham Atkins <gatkins at blueyonder.co.uk> wrote:
>>> A few things. Don't try and use unleaded solder. Use conventional  
>>> leaded
>>> solder on older equipment. The reasons the solder will not flow are
>>> either the
>>> iron is not at the right temperature, probably not high enough, or  
>>> the
>>> most likely
>>> problem you have is oxide on the joints/tracks. Try cleaning with
>>> isopropyl
>>> alcohol on a cotton bud. Application of some additional flux (pen or
>>> brush) may
>>> also help.
>>>
>>> Graham
>>>
>>> On 26 Sep 2009, at 21:14, cheater cheater wrote:
>>>
>>>> Can this be because of ROHS? (i don't know)
>>>>
>>>> D.
>>>>
>>>> On Sat, Sep 26, 2009 at 9:03 PM, cs e <modulemania at gmail.com>  
>>>> wrote:
>>>>> Hi,
>>>>>
>>>>> I'm trying replace some components on a 20+ year old pcb, but my
>>>>> solder won't stick to anything (other components or existing  
>>>>> joints).
>>>>> It just dries into little spheres and rolls off.
>>>>> Any advice?
>>>>>
>>>>> Thanks,
>>>>> Chris
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