Date: Mon, 24 Oct 2005 12:17:56 -0700
From: NODEraser <[EMAIL PROTECTED]>
I am intrigued by the idea of putting together a few cap replacement
kits. However, I'm not the best at electronics, and could use someone
to help with getting together a list of the parts needed, and possibly
writing some directions. If anyone is interested in helping me, please
contact me off-list at [EMAIL PROTECTED] .
I think this is actually a reasonable project to do on-list. In
particular, it would be good to post any lists of components, part
numbers and suppliers here so that other list members can catch
errors. Of course, creating parts kits is something to be done
off-list, but I think the error correction and discussion is good in
the early stages.
I am willing to help, but I can be quite lazy about digging out
motherboards and examining them.
The good thing is that most of the logic board caps are repeats of
the same two caps. IIRC, they're 47 uF and 10 uF, 16V capacitors,
where uF is micro-farads, farads times 10^-6, and V is volts.
Those are the surface mount electrolytic capacitors. It's been
suggested that they be replaced with tantalum caps which should not
have the leaking problem but may cost a bit more. However, within
the realm of surface mount tantalum caps there are variants. I do
not understand all the pluses and minuses of the variants and would
appreciate any education other list members might have on that topic.
I think it's mainly a matter of some caps being noisier than others
and perhaps having faster or slower charge/discharge curves, but I'm
not sure. The least expensive is probably acceptable for this
application.
Other than the SM electrolytics, each logic board seems to have a few
axial electolytic capacitors (three or four) as well.
The analog board capacitors are documented in Larry Pina's books so
those are easy.
Why don't we start with a list of logic boards for which we'd like to
create capacitor replacement lists/kits?
I'll start it off with:
SE/30
Classic
Color Classic
Classic II
and not relevant to this list but easy to do once you have the 47 and
10 on hand:
II, IIx, IIcx, IIci, IIfx, IIsi.
I can eventually count the caps on the SE/30, IIcx, IIci, and IIfx.
I have those boards on hand.
I haven't really heard of LCs (I, II or III), Q605s, or NuBus
PowerMacs dying from capacitor leakage. Anyone else?
Jeff Walther
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