Control system testing
Sorting out the control system on the main PCB. I have used extra lamps in place of the 2 motors and relays. The idea is to trigger the machine by hand (ground the output of the ring detector circuit) and see it go through the right sequence of operations. Sorting this all out took a long time, not least because one of the 'thyristors' I bought turned out to be a PNP transistor...
Control system testing
Sorting out the control system on the main PCB. I have used extra lamps in place of the 2 motors and relays. The idea is to trigger the machine by hand (ground the output of the ring detector circuit) and see it go through the right sequence of operations. Sorting this all out took a long time, not least because one of the 'thyristors' I bought turned out to be a PNP transistor...