PSU Recap Question on Values

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PSU Recap Question on Values

Hi all,

  I just received a recap kit from Console5.com. A very good site for such items! I ordered the kit for the model AIIe I have, AA11040-B.

I started to remove caps, and noticed the replacement caps values are different. I am not a EE person and do know too much about what the values mean. I have read you should replace caps with same or better.

The large caps on the high side show 100uf 250v. The replacement caps is about 1/2 the size and shows 47uf 250V. Can I use these?

Just want to verify.

Thanks

 

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That's half the capacitance.

That's half the capacitance. I would check with the seller. If it's not a mistake, it would be interesting to hear their reasoning. It's not like 100uf caps are unavailable.

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Doesn't sound right

KLund1 wrote:

The large caps on the high side show 100uf 250v. The replacement caps is about 1/2 the size and shows 47uf 250V. Can I use these?

 

That doesn't sound right.

 

The general rule of thumb is to *match* the capacitance (in your case the 100uF) and have *equal or greater* voltage specification (e.g. you could substitute a capacitor rated for 400V in place of a 250V capacitor).

 

Sometimes the capacitance can vary slightly, but going from 100uF to 47uF doesn't sound right to me. I'm only a pretend hardware guy so I maybe wrong, but I would wait for verification before soldering in those replacements!

 

Cheers,

Mike

 

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Thanks averyone.

Thanks averyone.

I did receive what they list as what is in an Astgec aa11040-b

https://console5.com/wiki/Apple_2

Also, looks at apples offical parts list here:

https://archive.org/details/Astec_Power_Supplies_Aug82/page/n19

what I got appears to be correct.

But I pulled 100uf out of mine. This unit comes out of standard IIe. 

The PSU does not look like someone went in and changed things.

thoughts??

Thanks again

 

 

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Some of the power supplies I

Some of the power supplies I've recapped came with 100uF capacitors instead of 47uF, and it look was its original value, I would replace it with the same capacitance values

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Larger one I assume would be

Larger one I assume would be better for a PSU anyway. So I'll order some.

Thanks everyone!! You help ia aways much appreciated for my novice questions.

 

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I also have recapped both

I also have recapped both type power supllies 47uF and 100uF, also noticed that some are with 47uF , others with 100uF caps. I replace them everytime with the same capacity.

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KLund1 wrote:The large caps

KLund1 wrote:

The large caps on the high side show 100uf 250v. The replacement caps is about 1/2 the size and shows 47uf 250V. Can I use these?

You have a kit for the Astec PSU but your PSU is probably a Dynacomp.   Dynacomp  use 2 x 100uF capacitors,  Astec use 4 x 47uF capacitors.

Short answer is no you cant use them.

 

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Some of Astec PSU's are also

Some of Astec PSU's are also with 47uF. This is one of them i had recapped.

 

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I changed the 47uf for 100uf

I changed the 47uf for 100uf and had no trouble. A2e booted up fine. No smoke. I put several cards in that draw a bit, and did not see any problems.

But I change all the 47's for 100's. I would not recomend a mix of them.

FYI

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I recommend you to change all

I recommend you to change all with the same capacity as original, no mixing and changing values :) If original is with 100uF replace them with 100uF again :)

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