Transformer repairs

[Rik]

You could try one of the CBM clubs, there should be someone who has some
spares..
The other option is rewinding the transformer, not the most thrilling
option..
The last i had, was suffering of a bad 9vac transformer that one I replaced
and the PSU was up again.

-RIk 

-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
Namens Ade Vickers
Verzonden: woensdag 28 mei 2008 21:20
Aan: 'General Discussion: On-Topic and Off-Topic Posts'
Onderwerp: RE: Transformer repairs

Rik wrote:

> Maybe this is some help.
> http://www.zimmers.net/commie/docs/sx64.txt
> http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/c6
> 4/sx-64/index.
> html
> 
> I do have a 22MB pdf file with the schematics, if you got a ftp I'll 
> upload it.
> 

Hi Rik,

Thanks - I found the schematics via Wikipedia (of all places); and the text
file too (can't remember where that was linked from).

>From the description, I think it's the "+12 volt switcher (2.8 Amps)" 
>that's
blown; the question is, where the heck would I get one of those from??


Here's the pin-out (from the solder side, heatsink towards you): 

240v   o          o  0v

240v   o          o  0v

n/c    o          o  0v     o  0v

n/c    o          o  12v    o 12v

  0v   o          o  12v

  0v   o          o  12v

Yes, there are two additional pins stuck out of the side; it looks like the
taps have been taken out separately. The 6 0v/12v connections are a guess,
based on the fact there are pins, and they're soldered into the same pads as
the outboard 0v and 12v. They may, of cours, all be n/c

Also, 0v is not *really* 0v, given that there's AC going in; except that
it's already been through a rectifier, which seems odd to me. Is this
something to do with it being a switching PSU?


>From what I can tell, this board is designed to produce 9vac, +12v and +5v.
I could fabricate an entirely new PSU, or even hacksaw up a PC supply (an
old AT type with a physical on/off switch) to go in this one's place; but
it'd be nice to keep it reasonably authentic.


Cheers,
Ade.

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