Quoted from Chrizg:And they had some odd solder work on them also when they were made.
Wow. I am surprised someone would try to sell a board with that kind of soldering work on it. At the very least the flux should be cleaned off.
Quoted from Chrizg:There was also a broken opto on one of the OG boards that was very hard to find
You can use QED123 for transmitter and QSD124 for receiver. This isn't the only opto transmitter/receiver pairs that you can use. Other manufacturers also make compatible transmitter/receiver pairs. It is best (but not necessary) to replace them in pairs so that they are matched for their optimized wavelength.
Charlotte, NC
