I have an intermittent issue on opto switch #2 on the bookcase. Sometimes when TAF starts up, it'll pass its test and work fabulously...but other times when TAF starts it'll fail opto #2 test and not work until a latter power cycle. It appears to be random whether it works or not when starting up the machine.
The other three optos work fine and haven't had any issues.
I've cleaned the plastics and the LEDs to make sure it's not interference. (took the bookcase apart and gave it a hell of a cleaning)
I'm looking for a best guess on this. Does it sound like an opto board problem, or the IR transmitter or receiver?