[Coco] CoCo 2 repair - Transformer?

[Louis Ciotti]

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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