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'[EE]: Good iron to rework TQFP.'
2003\02\19@105531 by A.J. Tufgar

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Hello all,
         I'm looking for a new iron to remove and replace some '877
TQFP's that shifted somehow in the oven.

I was looking around the list for some info and saw that the square
attachment style of iron tends to transfer to much heat and lift traces
and that a hot air system is the way to go.  Is this true?

My budget is around $1500 USD, so I'm pretty sure I could get a nice
system, but I'm unsure which method is the best for rework as I said
above.

I've been looking at Metcal stations, how are they?  Anyone recommend a
model from them or another manufacturer that would suit my needs?

Any got a link on TQFP rework?

Thanks in Advance,
Aaron

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2003\02\19@113200 by hael Rigby-Jones

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{Quote hidden}

We use hot air systems here for rework and they are nice to use, even I can
remove 80pin TQFP's whilst keeping the PCB intact.

If it's just the odd device then you can cut the leads off with a scalpel
and hand solder new ones in pretty quickly without damaging the PCB.

Mike

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2003\02\19@125839 by Ned Konz

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On Wednesday 19 February 2003 07:53 am, A.J. Tufgar wrote:
> Hello all,
>           I'm looking for a new iron to remove and replace some
> '877 TQFP's that shifted somehow in the oven.
>
> I was looking around the list for some info and saw that the square
> attachment style of iron tends to transfer to much heat and lift
> traces and that a hot air system is the way to go.  Is this true?
>
> My budget is around $1500 USD, so I'm pretty sure I could get a
> nice system, but I'm unsure which method is the best for rework as
> I said above.
>
> I've been looking at Metcal stations, how are they?  Anyone
> recommend a model from them or another manufacturer that would suit
> my needs?

The Metcal MX500 would be the system to get if you're looking at
Metcal. These can be bought on eBay if you want.

I believe you want the SMTC-1120 tip (double check just in case). Once
you get the hang of it, you should be able to remove parts without
injuring your boards.

You just put the tip over the part and apply gentle rotation. When the
solder melts, the chip will move. You then pick it up and wipe it off
on the sponge. You may want to have a pick in the other hand to help
hold it, depending on how tightly the tip fits the legs of the PIC.

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2003\02\19@171529 by Al Margolis(TX)

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You may want to look at this system: http://www.zephyrtronics.com/home.html

A full system with air bath and pencil is more like $2500.  Mine is on its
way (don't tell the "boss"), so I don't have any experience yet.  But after
playing with borrowed Metcal a bit, I decided this was a better option.

-- Al

{Original Message removed}

2003\02\20@092412 by A.J. Tufgar

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Thanks for all the help I did some more research and I beleive I'm
going to give xytronics a shot with thier hot air pencil.

Thanks,
Aaron

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