[Coco] CoCo repair-upgrade

[Arthur Flexser]

As far as your receiver goes, I think it's a safe bet that you had a
cold solder joint that was fixed by your resoldering.

Art

On Sun, Sep 25, 2011 at 11:46 PM, Chad H <chadbh74 at hotmail.com> wrote:

> Ok a few months ago I had a bad CoCo 2 I had to learn to de-solder the CPU

> and solder in socket for new one.  Had such success with it I went ahead and

> unsoldered the RAM and soldered in sockets, re-using the existing ram.  Went

> ahead and did this to couple more CoCo's and feel relieved at how easy it

> was and now all I would ever had to do is replace chips that are socketed if

> they go bad.  I even ended up following the notes of a CoCo user about

> upgrading the FD-502 packs' 7416 buffer chips to 7406 (Greater voltage spike

> tolerance I'm told, 30v vs 15v of 7416).  Again was easy and great

> experience.  If anyone has a flaky CoCo or FD-501/502 controller pak they

> need repair I would highly recommend taking a crack at this..it wasn't that

> bad at all, especially if you've ever soldered anything.  If not, send it to

> me, I'd be more than happy to assist.

>

>

>

> While I'm not confident enough to attempt soldering SMD's(?) or other modern

> miniature surface mount ICS's, I feel pretty good about the CoCo components.

> I even finally got the nerve up to open up my old Technics audio receiver

> that had been showing "overload" seemingly randomly".  Started de-soldering

> components I could figure out how to test and then resoldered them.  I

> couldn't identify a smoking gun, but oddly enough I haven't seen the

> 'overload' anymore.weird.

>

>

>

> I would like comments (hopefully constructive) and suggestions on my work

> from anyone that's already experienced with soldering IC's and components.

> I've already  taken photos of a FD-502 pak I upgraded and put them in the

> link here.  http://www.mediafire.com/?cde2vmcqp63jt   The 26-3127 & 26-3127B

> CoCo 2's pictured there were both upgraded as well.  I can disassemble them

> and take photos of the work if anyone's interested.

>

>

>

> -          Chad

>

>

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