[rescue] SPARCstation 1 boot woes

[Dave McGuire]

On 11/5/25 14:29, Mouse via rescue wrote:
> 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?

   It's 33uF, 16V.  As for the polarization, I need more information. 
Is it a cylindrical aluminum electrolytic, and is it a black ink or 
paint band?  Assuming yes, the band should mark the negative terminal.

            -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA