ML-1 Green Board (continued)

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Most of the board is depotted now, finally. I found the fricative (white noise) generator on here. It is composed of a quad XOR gate and some shift registers.

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Depotting is messy business for sure. I think most of the black on my hand is from the damn knife handle though- that aluminum seems to be rubbing off onto my fingers or something.

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Finally! Down to the very end. The trim pot has been removed (I don't know what it is for yet) at this point.

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These are all the old parts that were removed. Most of them are damaged, but all the chips should be OK. So far, I have not had a bad chip.. yet. With these 18 chips, I will have removed exactly 59. I will re-use some of the caps, and the chips, but nothing else. It will have all new resistors and mostly new caps.

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Top of the bare board after de-potting. None of the routes have been fixed yet.

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Bottom of the board.

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The mess left over! That's all the epoxy and bits o' parts left over from de-potting today.

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Here's the parts that will be going back on the board.

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And the chips. Like before, I tested each chip to make sure they were all in good shape and working. I seem to have *bent* one of the MC1437P's during removal or something, since the damn thing has a definite cambre to it that I don't think comes from the factory... I tested it, however, and it works just fine still! These chips sure are tough. I have "processed" a total of 59 chips now, and all have worked after the de-potting ordeal. I have not had to replace a chip... yet.

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And now all the passives and diodes and the single transistor are on the board.

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Finally, all chips are on as well.

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Schematic of this board. (note: clicky for larger)