Hi Alelandro
I also have some preset's from upper/lower that will not working good, sounds odd.
But with a quick view in the schematics shows that they where selected with the same OR-gates as the octave switch, so there's a good chance there are also some broken gates in it.
The 4000 Cmos series in this organ are all 1st. generation, so they are not buffered, they have less power to the outputs as the buffered once, but I don't care for the presets at the moment and will leave it this way.
Today I start with the analyses of the key-coder and the channel-processor, the heart of the digital system, and that will take a while.
Luckily the card is placed on the end of the digital box, so I have the space to measure there, but even if the connectors in the box are the same, you cannot move a card of interest to the side of the box, they have fixed places, so for the other cards I have to find a solution.
Greetings
I also have some preset's from upper/lower that will not working good, sounds odd.
But with a quick view in the schematics shows that they where selected with the same OR-gates as the octave switch, so there's a good chance there are also some broken gates in it.
The 4000 Cmos series in this organ are all 1st. generation, so they are not buffered, they have less power to the outputs as the buffered once, but I don't care for the presets at the moment and will leave it this way.
Today I start with the analyses of the key-coder and the channel-processor, the heart of the digital system, and that will take a while.
Luckily the card is placed on the end of the digital box, so I have the space to measure there, but even if the connectors in the box are the same, you cannot move a card of interest to the side of the box, they have fixed places, so for the other cards I have to find a solution.
Greetings
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