Wanted: A3000 power supply

[Castellen]

Sorry to dredge up this old thread, but if it helps at all, I've just written this guide on converting the A3000 power supply between 240V and 120V input, i.e. between European and USA models.

I've not tried this personally, it's based on an Email conversation I had with genny_flick (Thylacine Mini developer) who has verified it.  I've written some user-friendly steps and a few photos.

Would be interesting to hear feedback from successful conversions.


The usual warnings apply for working on AC mains powered equipment; don't touch they hurty bits, don't open the power supply if you're not fully confident working with AC mains, etc.

[Castellen]

I think it is supposed to be MJE13007G...the link to element14 on your page doesn't work for this.

Good spotting, that was an error, plus the URL had changed from when I wrote those repair notes years ago.  All fixed now, thanks for pointing that out.

[Castellen]

I think I have a bum Denise chip, the screen is all over the place and it affects the mouse even though I have a video card.

Have you checked for corrosion in the Denise socket?  That causes similar problems and tends to be more likely than a Denise fault.  When the A3000 battery leaks it can corrode the Paula and Denise sockets which causes poor/intermittent contacts with the ICs.  If the socket contacts look a bit green or blue instead of shiny, then replace the socket(s).  They're both DIP48.

Often you can test it; press on Denise while viewing an ECS display and if you see display changes happening as you move Denise, then replace the socket.

And U202/U203 heating issues are another common cause of graphics memory/display corruption.

OK, that's sufficiently ruined the subject of this thread.