[rescue] SPARCstation 1 boot woes

Mouse mouse at Rodents-Montreal.ORG
Wed Nov 5 19:29:25 UTC 2025


I wrote

> I finally got two of my SLC/ELC baords home and started to set one
> up.  [...] and...C10112 exploded.  Literally.  And the remnants
> caught fire.

I'm thinking of cutting the remnants off the board and soldering a
through-hole part into place, soldering the leads to the solder pads.
But that requires knowing the specs for the destroyed part.

Of the six machines I now have at home, four are SLCs (501-1720 or
501-1748, depending on which sticker you read); two are ELCs (501-1730
or 501-1861).  The board whose C10112 blew up is an ELC.

The other ELC doesn't work (fails selftest early in startup, getting an
unexpected trap).  It does, though, have an intact C10112.

It's marked

	3 3 6
	1 6 #

where the # represents something that looks like a K in a box.

I would tend to assume the 16 is the voltage rating of the cap.  The
336 is presumably the capacitance, but I don't know how to interpret
that.  I would tend to interpret the 33 as the significant digits and
the 6 as a power-of-ten multiplier.  But I don't know where the decimal
point goes in the significand and I don't know whether the 6 is
positive or negative and I don't know what the multipler base is.  In
short, I don't know whether that's

	33e-6 F
	3.3e-6 F
	.33e-6 F
	33e6 pF
	3.3e6 pF
	.33e6 pF
	something else

Also, I'd need to know whether the band marks the negative or positive
end of the cap.  (This one I may be able to determine by measuring
voltages on the non-exploded ELC; it doesn't work in the sense of
booting, but it probably works to the point of that cap having normal
voltages on it.)

Anyone with enough experience with surface-mount caps to know?

					Mouse


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