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Another update: I don't have an 11.79648 Xtal, but I do have a 12.000. I gently placed the legs of the 12.000 Xtal agains the legs of the Xtal soldered to the board and the screen jumped to life. A thin strip of compressed random characters on the left side of the screen, Maybe 10 columns in total. ...

Quick update: Naturally I suspect the crystal. I'm not sure it it's possible to check a crystal with a logic probe, but I did anyway. I looked at the non-working board. One leg is high with no pulse, the other shows nothing at all. I then looked at the working board. One leg seems to show pulsing hi...

I recently received another OSI machine. This time a C4P. After my success with the C4-2P I'm confident I can get this working. Firstly I tackled the CPU board. As I had a complete set of working boards, I just swapped the new board into the working system. Here is what I have found so far: - CPU di...

Great!
It sounds like you've revamped the circuit quite a lot. Unfortunately your link to the file seems to be dead, so I can't see what you have done.
I'm excited to see the changes, and excited to see this project progress.

Thanks
Phil

You can see how the fix is progressing here: case1.jpg case2.jpg case4.jpg Not as easy as I thought it was going to be, but regardless, I'm making some good progress. All braze has now been ground down using a hand grinder (what a lifesaver. I couldn't imagine doing it by hand as the braze is much h...

Hi, If you get them, I'd like get a few from you.

Philip

Hi glitch,
Fancy meeting you here.

Phil

My understanding is that HTS2000 is basically the same as other aluminum brazing rods that are available.

So the brazing rods arrived yesterday and today I had a chance to try it out. braze.jpg Some observations: - It's very hot. Don't be fooled into thinking you are dealing with solder temperature even though it looks identical when molten. - After the braze cools it can leave very sharp burs which can...

Agreed. I would have been totally lost (and I'd imagine many others too) if it wasn't for this site.

Phil