[sdiy] MCU Xtals

[Steve Lenham]

Mmm - saw that one. Perhaps I'm being dense, but how exactly do we think 
it works? It looks like just a lever which applies pressure to the side 
of the socket, which we have already agreed is risky. Phil's 3M tool has 
the advantage of moving the fulcrum down to the bottom and pushing down 
on the socket instead.


On 23/08/2022 16:40, Pete Hartman wrote:
> This one looks interesting:
>
> https://www.mouser.com/ProductDetail/TE-Connectivity/822154-1?qs=IGgAdOvCTsQgwBEedWVRzw%3D%3D
>
> Pete
>
> On Tue, Aug 23, 2022 at 10:30 AM Steve Lenham <steve at bendentech.co.uk> 
> wrote:
>
>     Yep, that would be better (as would pretty much anything). Initial
>     search does not throw up a source, but it is like searching for a
>     needle in a haystack made of those wretched diamond things.
>
>     On 23/08/2022 16:11, Phil Macphail wrote:
>>     Hopefully pictures work here, this is the tool I have for PLCC
>>     extraction. No risk of breaking the socket and works better than
>>     cheap “diamond” tools, but no idea if they are still made,
>>
>>     Phil.
>>
>>
>>
>>
>>>     On 23. Aug 2022, at 16:28, Steve Lenham <steve at bendentech.co.uk>
>>>     wrote:
>>>
>>>
>>>>>     If it's PLCC put thin screwdrivers in the slots in diagonal
>>>>>     corners and just lever it out. It really feels like the chip
>>>>>     would break in half any moment when you do it, but eventually
>>>>>     it goes out.
>>>>
>>>>     If you pry with screwdrivers too much, these sockets can crack,
>>>>     especially if they're "vintage".
>>>
>>>     +1 to that, although for "can" read "almost certainly will".
>>>
>>>>
>>>>     Best to get a proper PLCC IC extractor. They're not expensive.
>>>>
>>>     I have had no joy with those at all. There seems to be only one
>>>     design available - tiny hooks which are drawn upwards as you
>>>     squeeze inwards on the diamond-shaped handle. I find that what
>>>     happens is: nothing...squeeze harder...nothing...squeeze
>>>     harder...hooks rip a chunk out of the bottom of the PLCC, leap
>>>     out and score a nice deep scratch across the top of the IC for
>>>     good measure.
>>>
>>>     I've got a faulty Lexicon PCM80 here where I would really like
>>>     to try changing the main CPU, but it is a 68-pin socketed PLCC
>>>     and I can't get it out. I've tried, and the results were as
>>>     described above! As far as I can see, you just need to treat
>>>     socketed PLCCs as if they are soldered in, and desolder the
>>>     socket with the IC still in it.
>>>
>>>     I bloody hate PLCCs...
>
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