hi;
have a analog board out of a classic II.
seems to work just fine.
(motherboard went bad)
works on a classic II or classic..
just for shipping.
dale
----- Original Message -----
From: TT
To: vintage-macs@googlegroups.com
Sent: Thursday, May 03, 2012 11:04 AM
Subject: Re: Flyback Transformer
I think my flyback transformer has finally failed. The CRT is now
blacking-out and refreshing the solder joints at P1 and the transformer has not
helped. A classic Mac repair guide by Tom Lee indicates the flyback
transformer was a poor design choice and I am wondering if anyone knows if
there are more robust alternatives. Finding a new flyback is proving to be
difficult. Would later model Mac flybacks work such as the ones for the
Classic or Classic II? Does anyone have a known good analog board that they
are interested in selling?
Thanks,
tt
On Tue, Nov 1, 2011 at 2:39 PM, Doug McNutt <dougl...@macnauchtan.com> wrote:
At 15:57 -0400 11/1/11, Charles E. Fox wrote:
>At 02:04 PM 01/11/2011, you wrote:
>
>>On Tue, Nov 1, 2011 at 2:34 AM, Charles E. Fox <cf...@cogeco.ca> wrote:
>>> -- Many years ago when I did TV repairs we used to apply stuff
called
>>> corona dope. Try Radio Shack.
>>
>>Interesting suggestion. I did a little more searching and read that
>>sometimes flyback transformers can crack from overheating or aging.
>>If the internal high voltage is creating a corona/plasma since it is
>>exposed to air, does it mean that my transformer is still OK? I am
>>guessing if there was internal shorting, that the part would already
>>have gone bad. Does the corona dope need to seep into the transformer
>>to fill voids or do I just need to seal the cracked surface of the
>>transformer?
>>
>>Thanks,
>>tt
>>
>>-- I haven't had occasion to use this stuff in fifty years, but don't
think you will harm anything by applying it in the area where the corona is
visable and letting it dry before powering up.
>>
Neat pictures. It really helps to open the dark one in something that
allows you to play with colors and contrast. But I don't have any answers and
it's not a cracked solder joint.
Those coils, inside, are probably would with metal foil that looks a lot
like the aluminum sticky tape that comes in a roll. It's conceivable that one
turn is sparling to its neighbor and somehow the light is getting piped to the
top where it gets out. But through the opaque plastic covering?
The red paste looks like GE Glyptal, a paint like product that is found in
laboratories and used for the likes of repairing small vacuum leaks and high
voltage insulation. I wouldn't expect to find it on a new flyback coil
especially in a hand painted blob. Someone else may have been bothered by the
sparks.
I'm staring at an SE analog board from which I have stolen parts. Flyback
in a case like the picture 157-0042A TAI-HO Taiwan 08730 visible on the coil
near C13. Colorado Springs. CO USA 80919. Want to try it out? I seriously
doubt that I'll ever get around to using it.
--
--> From the U S of A, the only socialist country that refuses to admit it.
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