[Coco] CoCo 2 repair - Transformer?

[Zippster]

I was thinking one of the many Meanwell power supplies might be a good option.

- Ed

> On Dec 23, 2014, at 7:25 PM, Louis Ciotti <lciotti1 at gmail.com> wrote:
> 
> Why are you looking at replacing the transformer, From your last posts it
> sould like you found the problem with a bad ground lead. If I were looking
> at doing anything with the CoCo power supply I would do a total gut and
> replace.  Been a while since I looked at it, but I seem to remember that it
> was not exactly the best power supply design, even for the time it was
> produced.
> 
> On Tue, Dec 23, 2014 at 8:11 PM, Michael Graham <mkgraham at gmx.com> wrote:
> 
>> Hi!
>> 
>> I think you're looking at the specs on the transformer in the wrong way.
>> You're measuring 10.8V on each side of the tap, but that wouldn't make it a
>> 10.8V transformer, that would make it a 21.6V transformer.
>> 
>> It probably is actually a 17.5V center-tapped transformer, but you're
>> measuring 10.8V instead of 8.75V on either side of the tap because the CoCo
>> isn't drawing the full amount of current for which the transformer is rated.
>> 
>> --Michael
>> 
>> 
>> 
>> On 12/23/2014 6:52 PM, Chad H wrote:
>> 
>>> In trying to identify potential replacement sources for power supply parts
>>> I've yet to pin down one for the power transformer in my primary CoCo 2.
>>> It
>>> seems to be the same one in the 26-3027 as in the 26-3127 but there is no
>>> label on the transformer itself.  The technical reference I found for the
>>> 26-3136 talks about a 17.5vac transformer but when I measured my 26-3027
>>> secondaries I got approximately 10.8vac on each point to center.  I tested
>>> with the unit on and with it off, not much difference.  I was wondering if
>>> the following might be a possible candidate.
>>> 
>>> 
>>> http://tinyurl.com/lcwp2hp
>>> 
>>> 
>>> 
>>>   Can someone tell me if I'm on the right track?  Thanks!
>>> 
>>> 
>>> -          Chad
>>> 
>>> 
>>> 
>> 
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