has anybody ever had, and bear with me on this because it sounds stupid but I am about to kill myself... A problems with Optos whereas it would appear they are wired in series?
I have a dr who in bits at the minute which has a 10 way opto board fitted with 3 lm339 quad comparators fitted.
The opto for the time expander and the one for the ball popper won't register unless both are uninterrupted. As soon as one beam is blocked, both Optos extinguish in switch test. Both Optos run through u3 on the opto board, which is an lm339, which I have changed, 3 times now. I have checked voltages, which are on the high side of 12v, so I will investigate that soon, I have checked wiring looms back to the boards and it's all fine, I have even shorted the strobe and data lines with a diode across the correct colours at the output side and it's spot on, so the problem definitely lies with the opto board itself or the opto / wiring thereafter, not having a spare board to check with that's as far as I got. All the other Optos are perfect, just those 2. Has anybody every experienced this before?
Thanks in advance guys, Tim
I have a dr who in bits at the minute which has a 10 way opto board fitted with 3 lm339 quad comparators fitted.
The opto for the time expander and the one for the ball popper won't register unless both are uninterrupted. As soon as one beam is blocked, both Optos extinguish in switch test. Both Optos run through u3 on the opto board, which is an lm339, which I have changed, 3 times now. I have checked voltages, which are on the high side of 12v, so I will investigate that soon, I have checked wiring looms back to the boards and it's all fine, I have even shorted the strobe and data lines with a diode across the correct colours at the output side and it's spot on, so the problem definitely lies with the opto board itself or the opto / wiring thereafter, not having a spare board to check with that's as far as I got. All the other Optos are perfect, just those 2. Has anybody every experienced this before?
Thanks in advance guys, Tim