CDI Not working

[james Ashworth]

Hi I have built 2 CDIs one works and 1 does not. I belive it fault lies with the zener diode 4.7v, 0.5w that protects the gate the SCR as it works for a few sparks, then works intermittantly, then not at all. Guessing it stops doing it's job as it gets warm, any clues?

 

[EGRENIER]

You should put high res pictures of both side of you PCB to start. That’s the first things -expletive will look for.

 

[james Ashworth]

You should put high res pictures of both side of you PCB to start. That’s the first things -expletive will look for.

hi, image of circuit attached