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#5887
wilkie1
Moderator

Measure the voltage at the + terminal of the Opto-coupler.  In one position of SW2 you should be reading a varying voltage and in the other position you should read a steady voltage (set by the BLEVEL pot).  If you have voltages, then probe for a signal at IC1B pin 7 and then at R17 and then at IC1A pin 1.  Report your findings.