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Old 02-06-2020, 12:59 PM   #1
Retrogator
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Default Help with cap spec sheet

Need some advice on a vintage PC restoration project.

Trying to replace four axial caps on an AT&T PC6300 (aka Olivetti) backplane board that gassed and corroded the leads. Thankfully, no damage to the board. They are Ace 47uf 25V electrolytics -40 - 80C range (see pic).

This is an 8088 computer, so can't find the specs for these caps anywhere. I miraculously found a board schematic, but the caps are not depicted.

I replaced with IC 476TTA025M caps that match the capacitance/voltage/temp specs, but not sure they're working (getting a DMA error on POST which in these old machines sometimes indicates a power rail problem). PSU voltage looks normal. Could be due to another issue entirely, but thought I'd pick your brains about these old cap specs.
Attached Images
File Type: jpg Backplane closeup.jpg (157.4 KB, 11 views)
File Type: jpg ATT6300 POST Error.JPG (19.3 KB, 9 views)
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Old 02-06-2020, 05:10 PM   #2
R_J
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Default Re: Help with cap spec sheet

There is nothing special about them, any 47f/25v axial cap should work Here is a Digikey link https://www.digikey.com/products/en/...=1&pageSize=25
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Old 02-07-2020, 12:31 PM   #3
Retrogator
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Default Re: Help with cap spec sheet

Many thanks. Next step is possible memory parity error. That can cause a DMA 04 error. Fun, fun!
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