[sdiy] Oberheim DMX wackiness

[Eric Frampton]

To follow up on my earlier post -

> 1. the first few characters of the display are prone to show incorrect - but not random - characters. It looks like the display is hanging off the same data bus as everybody else, and since the rest of the machine seems to be OK, I'm not sure where the trouble is. I've tried swapping out the 74LS42 driving it to no avail.

A replacement LT1414 display module did the trick.

> 2. The hi-hat card is working, and the Tom 1 card is working, but only in any slot except the one they're supposed to go it. As in, the hi-hat doesn't work in hi-hat but does work in tom/snare/bass/etc, and the same for the Tom 1 card. Ideas?

Turns out they both had dodgy TL082s on the outputs. At least, replacing them solved the problems with both cards, though I must admit I don't know specifically why.

I do know I have a working drum machine. Yay!

e