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From: N_Cook on 22 Jul 2010 09:31
Not actually the 1meg failed it was the TO92 over the complementary 1meg
gone 35uA leaky, pulling the zero point upwards


From: Arfa Daily on 22 Jul 2010 20:45


"N_Cook" <diverse(a)tcp.co.uk> wrote in message
news:i29h5a$m4p$1(a)news.eternal-september.org...
> Not actually the 1meg failed it was the TO92 over the complementary 1meg
> gone 35uA leaky, pulling the zero point upwards
>
>

So, how did your lead-free lecture turn out last week ? Well received ? Did
you video it ?

Arfa

From: N_Cook on 23 Jul 2010 03:21
Arfa Daily <arfa.daily(a)ntlworld.com> wrote in message
news:aD52o.256076$vB5.100403(a)hurricane...
>
>
> "N_Cook" <diverse(a)tcp.co.uk> wrote in message
> news:i29h5a$m4p$1(a)news.eternal-september.org...
> > Not actually the 1meg failed it was the TO92 over the complementary 1meg
> > gone 35uA leaky, pulling the zero point upwards
> >
> >
>
> So, how did your lead-free lecture turn out last week ? Well received ?
Did
> you video it ?
>
> Arfa
>

outline from the .ppt here
http://www.divdev.fsnet.co.uk/scicaf2.htm
interested enough to have 3/4 hour of Q&A afterwards.
Someone from one of the PbF exempted industries there saying they were
having horrendous problems specifying and actually obtaining lead-free-free
components , there is a lot of fraudulent specification paperwork around
apparently.

And someone else from gas-fitting, no problem there as such, they just
charge the customers �250 for a new controller board when it is just PbF
solder failings on the not so old previous board, subjected to normal
in-service conditions but too much heat for pbf.




From: Meat Plow on 23 Jul 2010 12:04
On Fri, 23 Jul 2010 01:45:56 +0100, Arfa Daily wrote:

> "N_Cook" <diverse(a)tcp.co.uk> wrote in message
> news:i29h5a$m4p$1(a)news.eternal-september.org...
>> Not actually the 1meg failed it was the TO92 over the complementary
>> 1meg gone 35uA leaky, pulling the zero point upwards
>>
>>
>>
> So, how did your lead-free lecture turn out last week ? Well received ?
> Did you video it ?
>
> Arfa

Arrrrgggg!

I just repaired a 600 watt Coolmax PC PSU that had defective PBf
soldering. Don't -ever- buy that brand, they are very poorly assembled.
From: Arfa Daily on 23 Jul 2010 12:38


"N_Cook" <diverse(a)tcp.co.uk> wrote in message
news:i2bfro$df7$1(a)news.eternal-september.org...
> Arfa Daily <arfa.daily(a)ntlworld.com> wrote in message
> news:aD52o.256076$vB5.100403(a)hurricane...
>>
>>
>> "N_Cook" <diverse(a)tcp.co.uk> wrote in message
>> news:i29h5a$m4p$1(a)news.eternal-september.org...
>> > Not actually the 1meg failed it was the TO92 over the complementary
>> > 1meg
>> > gone 35uA leaky, pulling the zero point upwards
>> >
>> >
>>
>> So, how did your lead-free lecture turn out last week ? Well received ?
> Did
>> you video it ?
>>
>> Arfa
>>
>
> outline from the .ppt here
> http://www.divdev.fsnet.co.uk/scicaf2.htm
> interested enough to have 3/4 hour of Q&A afterwards.
> Someone from one of the PbF exempted industries there saying they were
> having horrendous problems specifying and actually obtaining
> lead-free-free
> components , there is a lot of fraudulent specification paperwork around
> apparently.
>
> And someone else from gas-fitting, no problem there as such, they just
> charge the customers �250 for a new controller board when it is just PbF
> solder failings on the not so old previous board, subjected to normal
> in-service conditions but too much heat for pbf.
>
>

Yes, I've come across this one. Apparently, there's quite a lot of problems
caused on these PbF boards, by relay hammer, which leads to the joints on
those devices fracturing. The real bummer on this though, is that the boards
have been manufactured in lead-free to help the environment (according to
the green mist eco-bollox brigade, anyway) but what's actually happening is
the things are failing *because* of the lead-free solder, and then a
perfectly otherwise serviceable board, which could easily be repaired, is
being replaced as a service spare, much like a faulty gas valve or pump
motor or whatever, because the person who calls out to fix the fault is a
plumber, and has little or no electronic savvy. A person who I know that is
a plumber, says that his garage is full of scrap boards, and that every now
and then, he just collects them all up and takes them to the tip. How green
and eco friendly is that ? I've been trying to persuade him to collect a big
bag of them up for me to take off his hands, but no luck so far ... I
wonder if the control boards from other appliances like washing machines and
dishwashers suffer the same because of lead-free construction. Actually
there is a little domestic electrical sales and repair shop next to one of
our cafes. Next time I'm down there, I will pop in and see the owner and ask
him. There might be some mileage in this. I'm thinking purely from the
business angle and wads in my pocket of course, rather than the green issues
.... :-)

Arfa

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