a2000 psu replacement

have a 2000hd with a recently dead (?) psu, and i feel like replacing it with a atx, i already bought a kit from iansteadman / etc and i've been wondering, what would be the best for this kind of mod. Would most atx work for this? does it need to have a certain type of volt, etc?

kinda intermediate w/ this kind of thing, so i just wanna be sure.

[Jope]

Just make sure your donor power supply has all the voltages present that your A2000 motherboard's PSU connector wants and wire it up.

Then don't forget to move the tick jumper on the A2000 motherboard if your adapter does not supply a tick signal.

Originally Posted by Jope

Just make sure your donor power supply has all the voltages present that your A2000 motherboard's PSU connector wants and wire it up.

Then don't forget to move the tick jumper on the A2000 motherboard if your adapter does not supply a tick signal.

in that case,
does it have to be 100% accurate?
like if some of it are a bit different (like .5a instead of 3), does it matter at all?

just wondering

[nexus]

you should be looking at +5v and +12v ratings only
.5a seems like you are talking about -5v or -12v that you should not be looking at for rail power
you need to look at the ratings for all and find a psu that does same or better
but the most important is the +5v and +12v then you make sure the -12/-5 are good enough then wire accordingly
then like said above about making the jumper switch as ATX dont have a TICK

[ElectroBlaster]

Iansteadman's adaptor provides the missing tick signal and also makes it very easy to connect up!

The hard bit is how you want to physically mount this inside the 2000.

I am a fusspot and would be pulling the atx psu guts out and putting them inside the 2000's psu case! would look 100% stock then.

But I was thinking earlier about a safer option, that would be to design up a 3D print bracket so it mounts the atx supply in place! much the same as was done for the A4000 psu mod.

Originally Posted by nexus

you should be looking at +5v and +12v ratings only
.5a seems like you are talking about -5v or -12v that you should not be looking at for rail power
you need to look at the ratings for all and find a psu that does same or better
but the most important is the +5v and +12v then you make sure the -12/-5 are good enough then wire accordingly
then like said above about making the jumper switch as ATX dont have a TICK

Yeah, tho, does it matter if it exceeds / less a little bit? just asking, since i have one thats pretty close, but not 100% (like 6 instead of 8)

[nexus]

always good to go over never to go under
but also depends what you are running
if just a stock a2000 then that would be fine but soon as you start adding cards hdd's etc then maybe you should calculate your power usage 1st
you never want to run a PSU at max load

[BrooksterMax]

I also have an A2000. And for age and noise reasons before the thing dies, would like to swap out the PSU.

Are there any plug and play replacements available? Or is it a case of adapting an ATX power supply using things like Iansteadmans kit for the job and making case adjustments?

[Daedalus]

Adapting an ATX PSU is probably the most common method. There are no plug & play options that I know of, but Ian Stedman's adaptor is pretty close. I would try to get a good quality, low power rating ATX supply however, as the higher performance PSUs tend to have higher minimum load requirements, which an A2000 might not meet. A small form factor PSU will also be easier to fit inside the original casing as well as being available in lower ratings.

Yep, going over the rating rather than under is the way to go if you don't know what the system actually uses, because a circuit will only use what it needs. But going too far over increases the risk of problems with minimum load that I described above: a stock A2000 only uses around 2A on the 5V rail, fitting a PSU with a 30A 5V rail could be problematic unless the PSU is designed to also handle such a low load. Older PSUs are better at this than modern ones.

The A2000 also uses practically nothing on the 12V rail as standard, and most current ATX PSUs treat the 12V rail as the primary output, expecting quite a heavy load on it. So even though the A2000 PSU might be rated for 8A on the 12V rail, 6A or much less will be plenty unless you plan on filling the machine with very old hard drives.

Another option is to use an industrial PSU module inside the A2000 PSU case. These are available in much lower power outputs than most ATX PSUs, and are more suited to Amiga use as a result. However you need to know what you're doing as there isn't a standard adaptor available like there is for ATX.

[hyami]

You make life a lot easier when you use a small form factor powersupply like SFX. They're a lot smaller and make it easier to fit in the original case.

[Jope]

I guess you guys haven't been A2000 owners.. An ATX/AT PSU PCB has lots of room to breathe inside the A2000's PSU case. :-)

[Daedalus]

Funny, I do actually have an A2000, but I haven't done any work on the PSU other than replacing the fan. I guess I never really compared it size-wise, but that does make things easier!