Back when I picked up my Boss RRV-10 reverb unit, it came bundled together as a lot with a Korg SQ-1, which was also nonfunctional. I found this a bit peculiar because the Korg SQ-1 really doesn't show up as broken all that often, since there really isn't much inside of it to break. It's pretty much a microcontroller with some knobs and buttons and some in and out ports.
When I opened up the unit to do my initial diagnosis, though, things got a little weird.
Working backwards, I think what probably happened was that the sync-in jack failed and caused the issue I saw near the end of this video where the sequence would stay stuck and wouldn't advance. Someone then started poking around inside and said to themselves "I guess if the sequencer isn't moving, then that means the clock is broken" and used all three of their braincells to tear the crystal clean off the board. After their failed bodge prevented the sequencer from booting up, they likely assumed they had completely destroyed the device and decided to get rid of it.
Well, out of the ashes of their failure rises the phoenix of my triumph, I guess. Time to toss this box into the "fixed" pile.
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