a500 PSU caps

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maeltar
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a500 PSU caps

Post by maeltar »

Looking at recapping my PSU, and hoping someone has a list that I can use to order..

getting no output from the PSU, checked fuses and also checked the main 2200uF 40v caps ( in circuit )and they seem to be goosed...

Hense recap the whole thing..
I know there a few different Power Supplies, mine if the old heavy one..
PSU.jpg
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IMG_20200817_081948.jpg (115.66 KiB) Viewed 4358 times
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IMG_20200817_081914.jpg (70.75 KiB) Viewed 4358 times
TIA
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rubber_jonnie
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Re: a500 PSU caps

Post by rubber_jonnie »

I'm assuming you're in the UK given it is 240V, and by fuses you mean in the mains lead and inside the PSU? Have you checked cable continuity for the mains lead and the power output lead?

Recapping is not a bad thing but worth checking the cables before you break out the soldering iron.
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maeltar
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Re: a500 PSU caps

Post by maeltar »

Yep, checked all that, to be fair, didn't check voltages on the transformer, just tested the caps and saw how nasty they looked..
yes, UK :)
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rubber_jonnie
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Re: a500 PSU caps

Post by rubber_jonnie »

maeltar wrote: Mon Aug 17, 2020 9:22 am Yep, checked all that, to be fair, didn't check voltages on the transformer, just tested the caps and saw how nasty they looked..
yes, UK :)
Fair enough, not everybody does.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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terriblefire
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Re: a500 PSU caps

Post by terriblefire »

I have one of those that still works but gets hot and stinks of fish so knowing the numbers for those big caps would be useful
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
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maeltar
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Re: a500 PSU caps

Post by maeltar »

terriblefire wrote: Mon Aug 17, 2020 9:45 am I have one of those that still works but gets hot and stinks of fish so knowing the numbers for those big caps would be useful
2200uF 40v it's the rest am struggling with..

I guess I'll just have to whip em out and see what i can find
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Re: a500 PSU caps

Post by rubber_jonnie »

maeltar wrote: Mon Aug 17, 2020 10:05 am
terriblefire wrote: Mon Aug 17, 2020 9:45 am I have one of those that still works but gets hot and stinks of fish so knowing the numbers for those big caps would be useful
2200uF 40v it's the rest am struggling with..

I guess I'll just have to whip em out and see what i can find
Whenever I am removing caps, if possible I number them on the top with a Sharpie and/or colour code them and take a photo before I start removing them. As I remove them I note what number cap has which value so I can make a list for ordering, and also to make sure I get the new caps in the right location.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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Re: a500 PSU caps

Post by terriblefire »

Are they X/Y class caps or standard electrolytics
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indicates how much hurting you shall receive."
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Re: a500 PSU caps

Post by terriblefire »

Opened up mine..

Mains side the main smoothing cap is a 400V 33uF

The one thats gone fishy is a 10V 1000uF cap.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
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Steve
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Re: a500 PSU caps

Post by Steve »

I would recommend just replacing the entire board with a Meanwell PSU. Just jump on YouTube and type 'meanwell amiga' and you'll see lots of guides. (I did this myself, they're really great)
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