Mac IIsi PSU inductor value

[captjon320]

Hello all,

I accidentally removed the L221 inductor from a Mac IIsi PSU when I was removing caps and don’t know what value it was.

If anyone can point me in the correct direction, it would be much appreciated.

I have circled it on the photo for reference.

 

[robin-fo]

It's 4.7µH according to the BOMARC schematics. If you want to be rally sure, I can open my IIsi's PSU for you to find out more.

 

[captjon320]

It's 4.7µH according to the BOMARC schematics. If you want to be rally sure, I can open my IIsi's PSU for you to find out more.

Nice,

Thank you very much. Didn’t realize that I accidentally removed it 4 months ago when I was on a cap removing day!


Would this be an acceptable part?

https://www.mouser.com/ProductDetail/Murata-Power-Solutions/18R472C?qs=5CKLVr1iF0liouiZVoT1cg%3D%3D

There is no reason to open yours up, I’m sure the schematic is correct. Where can I find that resource?

 

[robin-fo]

You can find the schematics for the IIsi and other early 68k Macs here. I cannot confirm that your part will work fine, but it looks right to me. You also need to check for the correct lead spacing.

 

[chue]

I happen to have mine open, as I'm recapping it as well. Here's a photo of the marking on the inductor. I don't know what it means, but it says "4R7".

 

[captjon320]

Thanks, I just ordered it up.

 

[captjon320]

Okay, I can verify that this part from Digikey is a correct replacement part for the inductor above.

RLB0913-4R7K-ND