[Coco] Caring for a CoCo
mmarlette at frontiernet.net
Thu Nov 19 09:27:13 EST 2009
Since the machine is apart. I would remove the GIME, with the proper tooling, a PLCC chip removal tool, and clean the leads. Soft white eraser, rubbed in the direction of the lead. This will ensure that you don't bend the lead.
Materials tarnish, sockets are a HUGH reliability factor. In defense designs, we can't use them, nor want to for this reason.
Not sure if you are using a multi-pak or not. Same applies here. Tandy did not use gold on their card edge connectors in the multi-paks or in the floppy controllers, 502 might have. My dev. system runs 24/7. Failure points will be in the multi-pak OR cards that DO NOT have a gold card edge. Another reason why ALL Cloud-9 products, that have a card edge connection, require that surface to be plated with gold. Thus a higher cost, but higher reliability = quality product.To clean the card edge connections, again use the white soft eraser, it won't be white for long....... :)
----- Original Message -----
From: "Boisy G. Pitre" <boisy at tee-boy.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Wednesday, November 18, 2009 6:00:45 PM GMT -06:00 US/Canada Central
Subject: Re: [Coco] Caring for a CoCo
I would think that would be an issue with a lot of CoCos and might explain some of the "strangeness" that CoCo's exhibit as they get older.
What would be the symptoms of this type of degradation james?
Boisy G. Pitre
On Nov 18, 2009, at 5:19 PM, jdaggett at gate.net wrote:
> On 18 Nov 2009 at 13:23, Mike Pepe wrote:
>> I would also consider changing out the electrolytic filter caps in the
>> power supply, as they do tend to dry out with age and the increasing
>> amounts of AC ripple riding through the supply can't be good for it.
> The electrolytics would only be a problem if the unit has sat for several years and not been
> powered up. Yes the electrolytic materail tends to deform with age and no charge on the cap.
> What happens then is the ESR of the cap goes way up. This reduces its function as a filter
> against ripple.
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