K40 Digital to analogue

Just completed my conversion and could not fire up the laser. Spent hours but could not find the fault. So I wrote the whole story down to post with pictures and only while explaining the process found the miscreant wire soldered to the wrong place. YEAH! It breaths fire again. So thanks to Ned and Don for their explanations, pictures and sketches. I still need to tidy it up but that’s for tomorrow.