Crumar Roadrunner/2 electronic piano from the mid to late 1970s.
I give a quick overview of the inside of the keyboard and then demonstrate the troubleshooting process for one of the dead notes. Also, I forget that the word "signal" exists.
An oscilloscope could easily take the place of the amp+test cable and LED, but I wanted to demonstrate a cheaper way to sniff out the circuitry because most people won't have an oscilloscope handy. This is not meant to be a step-by-step tutorial. If you are unsure about your ability to repair your own keyboard, take it to a tech!
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