[Coco] I've killed my CoCo3

[Ian Norley]

The best way is to use a desoldering gun. You can get a decent one for home
for not much cost but as per usual YMWV. I still don't have one and like
you I clipped mine, desoldered and then cleaned the holes but using a cheap
solder sucker. I would steer clear of the solder wick for this type of
operation unless you can be quick with the heat. Prolonged heat will lift
the pads. If you have a desoldering gun you will probably be able to remove
the chip without damaging it.
The other thing is to give the solder wick the best chance it can - clean
the area you're working on with IPA and then brush some flux on the pads
and the solder wick. Still, I'd rather not use it for this given the
fragility of a 35 year old board.
I knocked up a bit of a tut of how I do it here
https://sites.google.com/site/episodesintime/coco-maintenance/6809-to-6309-upgrade
Some people like to get a bit carried away believing there is only one way
to ever do something but let's be pragmatic about it - this stuff isn't
going into orbit. What I've got there will do the job, of course the onus
is on the person doing the job to be careful with the tools and methods
used. Anyway just adding it here as I haven't seen anywhere else that gives
a run down. If you get anything out of it then great. Good luck with future
operations.

Ian...

On 19 October 2017 at 22:34, Joe Grubbs <jsgrubbs at hotmail.com> wrote:

> Hey Paul,
>
> Man I'm sorry 😞   Sometimes it's unavoidable as aging will often cause
> the PCB to become quite fragile. I'm always a bit wary when using wick for
> this very reason. I feel safer using a vacuum to clean up the solder. It's
> more laborious but I've never had a pad or trace lift using that method.
> The same can't be said for wick...
>
>
> ________________________________
> From: Coco <coco-bounces at maltedmedia.com> on behalf of Paul Shoemaker <
> paulfe3 at swbell.net>
> Sent: Thursday, October 19, 2017 7:13 AM
> To: coco at maltedmedia.com
> Subject: [Coco] I've killed my CoCo3
>
> Hi everyone,
>
> Yesterday evening I decided to replace the 6809 with a 6309 in my CoCo 3.
> Although I am still an amateur with a soldering iron, I've been practicing
> and recently completed this same process on one of my CoCo 2 systems where
> I clipped out the 6809, desoldered the remaining pins, and soldered in a
> socket.  However, when I tried this same approach on my CoCo 3, as soon as
> I started using solder wick, I noticed some of the solder pads began to
> come off.  I don't think I was using excessive heat (same iron, same heat
> settings as before).  Even the traces on the board began to lift up.  It
> became clear to me after this happened to a few pads that I had destroyed
> the board.
>
> If anything I was more gentle with the CoCo 3 board than I was with the
> CoCo 2 board before.  It was evident that the CoCo3 board was more
> "weathered" than any of my other systems...  more dust and dirt inside, a
> lot of oxidation on the RF modulator box, etc.  It may be that this CoCo 3
> spent many years in a garage or shed prior to me rescuing it from eBay last
> year.
>
> Any advice on how to avoid from happening again this in the future?
>
> -Paul
>
>
>
>
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