--- On Sun, 11/1/09, Gorka L Martinez Mezo <[email protected]> wrote:
> I have a Performa 631 with the standard 68LC40 processor
> (no heatsink). The
> CPU is socketed but I have never tried to extract it.
>
> Could the 68LC40 be replaced straight away with a full
> 68040 as fitted to
> the Quadra 630? Do I need any special tools to remove the
> original CPU?
Yes, you can replace the CPU with the full 040.
The ideal method of removing the CPU is with a puller. It's a two part tool
with an outer "U" shaped piece with the ends covered to protect the board and
an inner, spring steel "U" with the ends bent in to catch two edges of the
chip. A screw is used to pull up on the inner part to pull the chip.
Those might not be easy to find these days since PGA style chips and sockets
aren't very common.
I never used one back in the days before ZIF sockets. I just used a small, flat
blade screwdriver and carefully pried up a little at a time on each edge until
the chip was out.
DayStar sent a puller with any of their CPU upgrades and adapters that required
pulling chips. (Except for the IIcx, you had to verify the CPU was socketed
before they'd send the puller - after they had some people destroy their boards
trying to pull soldered CPUs.)
If you bend a pin, here's the perfect tool for straightening them. Find a
syringe needle that will just slip over the pin and grind the point off so its
straight. Use a sharp and pointy knife to deburr the inside of the needle after
grinding it. A metal file should work, just slower than a Dremel or bench
grinder.
The needle lets you get to any pin without touching the ones around it. Look
sideways across the chip from all directions, the slightest bend in a pin will
show easily.
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