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Old 02 November 2017, 19:33   #1
system11
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A2000 PSU fan - 80x80x20?

Does anyone know where I can find a good quality 80x80x20mm fan for the A2000 PSU? I can find cheap Chinese OEM, other than that all the good 80mm case fans are advertised as 25mm which won't fit in the 2k PSU.

I did manage to find out the existing one is rated approx 23CFM.
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Old 02 November 2017, 19:43   #2
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I bought this for my 4000, haven't put it in yet. I went by a recommendation of another Amiga user. Should be available on Amazon UK I would think.

As a novice, how dangerous is opening these psu's up? What to avoid.
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Old 02 November 2017, 19:50   #3
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Make sure it's unplugged and don't short out the big capacitors as they can hold a charge for a while. In the scheme of things they're not particularly dangerous but you'd probably feel it. Photos suggest A4000 supply could easily take a 25mm one, the link/image in your post is missing though, what did you get?
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Old 03 November 2017, 00:43   #4
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This one. Haven’t tried to install yet.
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Old 03 November 2017, 00:43   #5
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My Amiga 2000 (PAL, 6.2) had a 80x80x25 Nidec fan in the PSU, although it is actually in an A2500 case (and then even among A2000s different PSUs were probably used over time or in different markets), so maybe your's is different. I forget which model the PSU was exactly, and I don't have the machine here atm to check.

Shorting out the caps is not so much the problem, as long you don't use your finger to do it You actually would want to short them out in order to discharge them. But to be safe, just dont touch any exposed metal on the PSU itself.

If I were to change the fan again, I would not desolder the old fan leads from the PSU board, because I found it rather tricky to solder in the new leads. I had to fiddle them in between the capacitors, and the drillings on the bord were the same size as for the mainboard power rail leads and thus much too large for the small fan leads.
Instead I would cut of the leads from the old fan, and then make wire-to-wire connections with the new leads. That also takes care of the "no touching exposed metal on the PSU"-part
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Old 03 November 2017, 01:16   #6
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Don’t touch the metal?
That brings me back to childhood and the Operation game
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Old 03 November 2017, 02:18   #7
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Easily fit an 80 x 80 x 38 mm fan in the A2000 PS. Under-volted the 12v fan via a 5v tap on the printed circuit board. Pushes a lot of air very quietly.
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Old 03 November 2017, 03:36   #8
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I looked for photos and indeed there are very different A2000 PSUs. You couldn't fit anything above 23mm in mine, it would crash into a small transformer block.

I think i found a solution - a 80x80x15 fan from a CPU cooler, will post the model if it works.
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Old 03 November 2017, 04:32   #9
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You could replace the entire PSU for a modern high wattage ATX unit. It would require an adapter and retrofitting into the A2000's case.

You could try switching the Amiga 2000 on while it is NOT connected to the mains supply. This sometimes helps to discharge any energy remaining in those charge caps. <Doesn't always completely discharge caps! Extreme Caution at all times when entering the PSU.


Link to the adapter you require, if you decide to ditch the OLD PSU.

http://amigakit.leamancomputing.com/...roducts_id=998
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Old 03 November 2017, 05:05   #10
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I like to keep things original where possible, it's not worth replacing a well-built older power supply if it's still functioning correctly. It's just a bit noisy especially in the first few minutes because the fan bearing has started to wear out. Actually doesn't that affect the use of the A2320? That demands that the tick jumper is on the powerline setting, which you have to change if you fit an ATX.

The ones I am careful with though are older linear power supplies, quite a lot of them are known to turn bad and lack any kind of overvoltage protection, for example the original Commodore 64 power supplies are basically bricks of death at this point.

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Old 04 November 2017, 20:14   #11
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Fits really well. You need a Deepcool HTPC-200 CPU cooler, finding 80x80x20mm case fans is nearly impossible unless you go for the industrial noisy Chinese units (if you do, Sepa seem the best). A bonus with this model is the solid fitting holes, the original unit doesn't contact the PSU case where the screws are and as a result as you tighten it up, it can warp the back.

It's a 4 wire fan, when you've removed it from the heatsink cut the other two wires half way up the cable at 2 different lengths (removes any possibility of frayed ends touching at the cut), then heatshrink that section of cable. You can re-use the old connector housing but use new pins. Pins 1 (ground) and 2 (12v) on the fan connector should be used.

Refit screws with a little threadlock or similar (I used PCB masking touch up fluid) - possibly some of those rubber fan fitting "rivets" would work, I just don't have any to try with.
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Old 21 November 2017, 11:42   #12
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Unless it already is new, I would get rid of that nasty line filter (which is inside the tubing directly attached to the plug). The old ones have a habit of, well, bursting, and the smell afterwards is ... unbearable.

Also, if you see flickering on the screen while the floppy drive is busy, I recap of psu (and sometimes also the board itself) is in order.
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