Voltor07 wrote:Some capacitors can definitely shock you. My guess is you touched a large value capacitor on a board.
thealien666 wrote:My guess is that you must have inadvertently touched the mains wires on the PSH32 board (power supply board on the center bottom part of the synth, near the key contacts).
BTW, there is not enough voltage in capacitors inside this synth to shock you. But 120 V.A.C. from the wall outlet will !!
Suggestion: while power is off (power cord disconnected from wall outlet) temporarily tape a piece of cardboard over the lugs on the power supply board, until you fix it. Don't forget to remove it after everything is fixed properly though...
EDIT: In PCs the PSU is self-contained, and all dangerous high voltages are inside an isolating Faraday cage. Only low voltage comes out of that PSU box. But in synths, the PSU is composed of several parts, often laid out and easily accessible inside the casing. In the SH-09, the power cord comes in from the back on the right side of the synth (standing in front of the keys) and the transformer is all the way to the left side. So there seems to be a small board that receives the wires from the power cord et redistributes it to (possibly) the power switch and eventually to the transformer at the other end. That little board is where the 120 V.A.C. is exposed.
n2design wrote:I'd love to start buying old broken synths and fix them up, I wonder what the learning curve is like for people without a formal background though. which is harder, finding replacements parts or knowing what to do with them?
Voltor07 wrote:A little bit of both, actually. I am by no means a synth tech, but I DO know my way around a soldering station. I took AC/DC Fundamentals in high school, as well as some low-level college courses after high school. Synthesizers are fine pieces of equipment and vintage ones are particularly hard to find parts for. A lot of it has to do with the fact that IC's are constantly changing. Replacements for an SSM 4080, for example, are pretty hard to find. Solid State Microsystems went out of business years ago. The chip burners for the 4080 are nonexistant, though there is a limited number of NOS chips that can be had...for a price. Other chips, custom made by the synth companies for a specific purpose (Moog Polycom chips, for example) are very hard to find, and are usually very expensive. If you want to teach yourself, the library is your friend, as is Kevin Lightner's website. He has documentation for a vast number of synths, but you may want to learn how to read schematics first.
thealien666 wrote:And in all this time, I've come to realize that about 80% of the time that something goes wrong in an analog synth, it is usually due to poor mechanical/electrical contacts. Either in key contacts, or chips sockets, or switches and connectors.
Do you buy alot of broken synths on ebay? That would be a fun hobby.
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