Trough issue, follow what ltg said above, or replace the opto boards, they are cheap. It’s either loose plug connection on opto board, bad solder joint or the opto transmitter is just flaky or bad.
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2 years later
Quoted from bobzilla:Is there a cheat sheet to know what and where the OPTO board is? I’m a noob
There are two opto boards on either side of the trough where the balls eject.
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