I haven't managed to get my Emulator II to sample from the day I got it. I see no signal when playing into the input (using another synth, or an electric guitar). I decided to investigate this further and found that what seems to be the sampling circuit, has two electrolyte caps, which on the schematics are marked as "alum-electro (nonpolar) 4.7uf" but on the actual board, regular POLAR caps are used. These caps I put myself while recapping the machine when I got it a few years ago. I tend to think that this causes the sampling circuit not to work, BUT - a closer look at the board reveals a + sign near each of these two caps, as if the engineers did intend to use regular POLAR caps there... I'm afraid to replace them with non-polars so I don't damage the circuit... Any advice / info on this ? Will anyone be able to take a look at his E-II voice board and check if these two electrolyte 4.7uf caps are bipolar (there should be a "NP" mark on them, and no polarity marking) ? They are right under the power supply at the top-right corner of the left board. The diagram is probably page 42 in the manual: http://www.synthesizerarchiv.de/circuits/emu/emulator2_circuits/emulator2_circuits.pdf Thanks !
Message
Don't know if the original caps were polar or bi-polar (E-II)
2012-12-10 by Gil