(Topic ID: 274238)

System 11B Cap Polarity Question

By fixintoplay

1 year ago



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  • 7 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by fixintoplay
  • Topic is favorited by 1 Pinsider

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cap axial (resized).JPG
caps comparison (resized).JPG

#1 1 year ago

I am replacing the vertical line of 8 orange caps C60-C67 in the sound section of the CPU. Their original polarity placement varies down the line. The new replacements I got have no polarity markings on them. Does it matter which way the new ones are inserted?

Manual says originals are "0.1uF 100V +/- 10%."

The replacements are "0.1uF 100V +/-10% Low ESR HF polyfilm" and stamped "2A - 104K" on only one side. No other marking.

It seems as though polarity doesn't matter with these, but if it does, which way should they be inserted?

I believe this 11B CPU board is identical to Taxi and Earthshaker. Advice very much appreciated. Thanks.

caps comparison (resized).JPG

#2 1 year ago

Those caps are not polarized. Either way works.

#3 1 year ago

Awesome, thanks! I did notice on the reverse (solder) side of the CPU, there are (-) symbols etched on one side of each of the 8 pairs of solder holes for that row of caps, so I was being cautious.

I do have another question about the C60 electrolytic axial which I am also replacing, but I have a radial of the same specs. Would that be an OK substitute, and does the "0" gray band indicate the pos+ pin? Thanks again!

cap axial (resized).JPG

#4 1 year ago
Quoted from fixintoplay:

Awesome, thanks! I did notice on the reverse (solder) side of the CPU, there are (-) symbols etched on one side of each of the 8 solder holes for that row of caps, so I was being cautious.
I do have another question about the C60 electrolytic axial which I am also replacing, but I have a radial of the same specs. Would that be an OK substitute, and does the "0" gray band indicate the pos+ pin? Thanks again!
[quoted image]

The grey band with the "0" is actually a negative sign. So that leg is the negative and the other leg (which should be slightly longer) is positive.

#5 1 year ago

Thanks for the responses! And you're right, one of the legs (the positive) is in fact slightly longer. I've got to figure out a way to remember that critical fact. So, generally speaking, axials and radials with identical specs are interchangeable as long as there is space available?

#6 1 year ago
Quoted from fixintoplay:

Thanks for the responses! And you're right, one of the legs (the positive) is in fact slightly longer. I've got to figure out a way to remember that critical fact. So, generally speaking, axials and radials with identical specs are interchangeable as long as there is space available?

correct - and note that some board locations (like the larger filter caps) have through hole locations for either an axial or radial cap. If bending a leg from a radial cap back along the axis I would use some heat shrink (or maybe you need to add some extension wire).

#7 1 year ago

Good advice. Hadn't thought of that. Will do.

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