Hi Tom,
I swapped in two resistors in line 69R, unfortunately the flash hasn't triggered yet, but I pulled two leads from the main terminal pins to check their resistence. There is definitely a jump on the other side of the switch when the signal is sent, so I'm wondering if it could be the length of the pulse that's specefic in order to ignite the flash circuit as you said before. I've tried multiple lengths from 1ms to 2seconds without luck and also tried without the LED. I think we're close. I've attached another picture. If you can think of any other ideas please let me know. I'm wondering if using a triac between the optotriac and flash would help. I'll give that a go.
Thanks!
B
