What do you mean the relay does not switch off?…Is is stuck in one position or the other? What did you mean when you said you get a “full bypass tone and the effect stays on”? Does the signal run through the effect circuitry or is it bypassed through the pedal? I’m confused.
So for good measure let’s double check to make sure the relay is working…
When the effect is on, as in when the red led by the bypass footswtich is on and you expect to hear the tremolo sound through the pedal, pins 1 and 3 of the relay should be connected and pins 4 and should be connected. Test this with your continuity tester.
When the effect is off and the signal is just bypassed through your pedal pins 3 and 2 should be connected and pins 6 and 5 should be connected. Please test these and let me know what you find.
If the relay isn’t working properly….
Try to re-seat your microcontroller in it’s socket. We need to make sure the pins that control the relay are making good connection. Be careful when you pull it out not to bend any leads.
If the relay appears to be working properly then…
With the pcb out of the chassis, make sure each of the pots are bent slightly upward away from the board to ensure none of other component’s leads are touching the back of the pots.
With the depth knob set fully counter clockwise, what happens when you touch TP3 and/or TP1? Do you hear any noise? TP3 and 1 are directly before the LDRs.
Please be specific about which trim pot were you touching…VR8, 9, or 10?
Let me know what you find.
-Brach