[Coco] I've killed my CoCo3

[Joe Grubbs]

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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