The Future was 8bit

Commodore Amiga 4000 PSU upgrade/repair

Even though I have already replaced the capacitors in my A4000's PSU.. I just didn't trust it! Oh and the cooling fan was just too noisy!

So I thought to myself, bugger it I've got a spare A4000 PSU, I'll convert an ATX PSU and refit it in the it's case. So the first thing I did was find an ATX supply that not only had enough current to supply the A4000, but was smaller then the original case so I knew the PSU PCB will fit the original Amiga PSU case.


BeQuite-A4000PSU-1.jpg
The Be-Quiet SFX-300W Does what it says on the tin.. It's very quiet, and has more amps than the original A4000 PSU.
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The BQ PSU could fit in the A4k case. That's as long as you didn't want to connect the mains to it.

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Doesn't it look nice! Cut the fan cable, and cut the mains supply cables to the PCB.
The mains in is simply reattached to the existing A4k mains in and switch.

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Pillars installed, with spacers to get them to the correct height.

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PCB installed. And the ATX cable has been replaced with the original A4k power cable.
You need a very good soldering iron to remove the old ATX cables. A PS-ON to GND cable makes sure the power supply powers up when the mains power switch is switched.

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 Nearly there.. Mains reconnected.. Just need to reinstall the on off switch.

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A screw.


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Mmmmm yummy.
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This is the first time this PSU has been opened since it was built. The dust in here is half my age. :( Oh dear, I'm old.
I've unplugged the mains in, and removed the on off switch, as I will use all of this with the new PSU.
BeQuite-A4000PSU-6.jpg
 Using one of the existing PCB mounts I've marked out three more positions for the other pillars.

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All of the pillars need to be flush on the bottom of the case.

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Fan reconnected.. And some special tape to insulate the PCB edge from the chassis.


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And finally, some heatsink compound ready to accept the chassis.

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That's better! The original Amiga PSU was outputting 11.3v on the 12v rail, and 4.7 on the 5v without load.