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Hey voip! Thanks for all the help
New key contacts - perfect. Turns out the guy did clean the contacts. With deoxit. I think my problems and inconsistencies were due to the fact that only three k ...

I think I'm going to buy a full set of key contacts. 100US$ from LA Synth or something like that. The owner's ok with it. Any thoughts?

Getting really close.. If I remove the keyboard assembly and just press the rubber pads, they work - but it requires too much pressure to hit some of the notes. And when the keys are in place there i ...

I just went ahead and cleaned the key contacts. I have the top three keys working. There doesn't appear to be any cracks in the pcb, and the traces and contacts on the board all have continuity. But ...

Now I am testing continuity on the keyboard. I am getting continuity from connector pins 7-14 to the various anodes, but I couldn't find any of the cathodes while pressing down handfuls of keys. I'm ...

Thanks so much for the help.
I'm getting the same scope display on IC2 pin 9 - 5us/div, DC, and there is one stationary, constant +5v about 5us wide, and no response when I press the mode buttons. Wh ...

Maybe something is not right with the clock signal coming into IC3. First of all, I am seeing no response to the keys.
The signal I'm seeing is odd, at pin 5 of IC3. this may involve my fluke 97 50M ...

Can you point out a couple points on the KLM-356 where I could see some action when the keys are pressed? Seems like the next thing to do.
I don't know what the 4 VCO LEDs actually indicate, but I ha ...

Thanks

Those LEDs are all working according to the corresponding button press.
The owner may have gone so far as to unplug the keyboard assy, and then gave up. He wasn't sure.

Hi. I could use a little guidance-
I'm attempting to fix a friend's Mono/Poly. A vintage unit - pc board version indicated are KLM354C if that helps. I"m using this schematic:
http://dl.l ...