I am sorry to hear about that unfortunate event, as I mentioned on my previous post I have had to revive mine a few times and have learned a lot in the process. ?The last time it died I chased my tail for 2 years and went through just about everything and took measurments card by card and board by board, do you have an email address I could sent you my excel sheet to? ?Who knows you might find it helpful! ?As for the AT, I had to rebuild mine COMPLETELY¡ ?Not pretty but it works. ?A lot of my pads were entirely worn out, I applied a copper tape to the pad and the ones I replaced work better than the ones with the original coating!
I don¡¯t know if I would turn it back on just yet though, if you haven¡¯t found out what the problem might be (did I get this right?) I doubt it would be any better now¡ ?Which wires did you jiggled?
Let me know where to send the Excel sheet.
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Martin: I was fixing an issue with the polyphonic aftertouch on my CS-80. A cluster of notes was going full volume no matter how softly I played, and I'd traced to the problem to an open on the +15V aftertouch sensor rail, which I fixed with a jumper, and while I was in there removed all the keys and poly AT sensors and cleaned everything. As a side note: I found out later from a local tech here outside of Philadelphia (he services CS-80's, Paige Hamilton's CS-60 and a local GX-1), that one should be careful with what kind of cleaner you use on these, if any, as they are infused with a resistive material that can be drawn out. I used Tascam RC-1 rubber pinch roller cleaner, and am hoping I didn't do any damage.
So long story short, I forgot to pull the keyboard chassis forward before lowering the card riser, and the metal 15V rail crunched into the PCB's at the rear of the keyboard chassis. No big deal at the time, I thought, but when I powered the CS-80 back up, all the oscillators were firing, and when I started jiggling a few wires I heard a pop, which was likely the 500mA fuse blowing, and then silence. I powered it up a few times thereafter, but all I heard was a high-pitched wine and a white noise hum, and haven't turned it on since, but now that you've validated the resistance I should expect to see between the card rail and ground, I'm going to recalibrate the power supply and fire it up and see what happens.
D T: I think I'm guilty of both on M-Wiggle! I expect to continue to be confused by the engineering of the CS-80, but I am enjoying learning how it works. I haven't heard about Old Crow's voice card project, but did hear back from him recently about a KAS board YM26600 retrofit he's been working on.
