At 10:39 AM -0700 5/31/00, B.T. Corwin wrote:
>Where do you get a heat transfer shim from? Have a piece of solid
>aluminium 2.5mm thick cut for you? Or is something like this available
>at computer supply shops?
Nothing as thick as that, for the CPU. I just used a small piece of
aluminum foil folded over a couple times and carefully smoothed out
with my fingernail. And to clarify, I'm not recommending using a
shim to transfer heat; its purpose is to raise the heat pipe's heat
transfer block so it presses against the CPU a little more firmly.
By "transfer block" I mean that squarish chunk of aluminum on the
bottom case half EMI shield which has a tube (the heat pipe) coming
out of it. The tube is permanently attached to the thin aluminum
sheet metal EMI shield, but the transfer block (which gets heat from
the CPU into the heat pipe) is not directly attached. I just
carefully pulled the up on the block to get the leading edge of my
foil shim underneath, and then pushed it all the way under the block.
The later 2400/240 model Apple shipped in Japan actually had a
shim/spring installed by the factory in the location I'm talking
about, precisely because most 2400s don't get good contact without
one.
If you make the shim too thick, you'll notice the motherboard
assembly won't sit nicely in the bottom case half when you try to
install it.
If you want to make a much thicker shim to help make contact between
a 9.5mm hard drive and the HD heat transfer pad, you'll probably have
to have something custom made.
Tim Seufert
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