X-ray board restoration and Altair 8800/Macintosh X-ray Was: Apple IIe X-Ray
grant at stockly.com
Fri Dec 29 18:07:56 CST 2006
>Well, if the board is just double sided (i.e. all tracks visible, except
>where they pass under components), you can generally trace tracks by eye
>and confirm with an ohmmeter. And if there are internal tracks, I think
>tracing those from an X-ray image wouldn't be exactly trivial.
Before you read the text below, am willing to help anyone out who has
equipment they want to reproduce (as far as getting the x-ray goes)...but
its not a fast and easy method.
It isn't easy, and I would advise against it. If you have 4 layer product,
TWO boards and are willing to throw one away, then it is cheap and easy. I
wouldn't have ever came out with www.altairkit.com without the guys at
www.mhtest.com. They will take your 2-3-4-etc layer board and generate
production ready cad drawings. A 2 layer board does not need to be
destroyed, however a 4 layer board will need to be "planed" so that they
can scan the inner layers.
Most 4 layer boards just have a VCC and GND power planes, so the top and
bottom are the signals. I still wouldn't use the x-ray to generate the cad
artwork. Been there... ; )
Here are two shots of a Mac 512k motherboard. You can see the difference.
This is what a 4 layer board CAN look like. You can see the holes in the
middle layers where the through hole devices go through.
Take a look at my website at www.altairkit.com and read the story link. I
first tried to duplicate the boards with x-ray, and even developed a way to
do it (it just takes a lot of time). The method involves scanning the back
of the board as an image and combining it with the x-ray. The grey traces
will be on the top and the orange ones will be on the bottom.
X-ray of Altair 8800 CPU board:
The photo scan of the Altair 8800 CPU board:
The x-ray / photo composite:
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