Ring detector testing
Testing the ring detector part of the machine. The line terminals on the transformer unit are connected (red and green clip leads -- what other colours would I use :-)) to the 'Converter Ringing 7A' (the grey box with the mains warning label sitting behind the line transformer unit. When I powered up the Converter Ringing 7A, the machine triggered and went through the right sequence of operations.
Ring detector testing
Testing the ring detector part of the machine. The line terminals on the transformer unit are connected (red and green clip leads -- what other colours would I use :-)) to the 'Converter Ringing 7A' (the grey box with the mains warning label sitting behind the line transformer unit. When I powered up the Converter Ringing 7A, the machine triggered and went through the right sequence of operations.