When you figure out an EM’s schematic - it’s like an epiphany! For me a dusty old continuous black and white schematic suddenly “comes alive” within my mind turning various circuits into full colour, eg the reset circuit is red, the end of ball is green, the game over is blue. Out of all the pinball repairs I have done, fixing up an EM is more satisfying than a full refurb of a SS game.Working on EMs is a bit of a tedious puzzle, my dad likes them but I don’t share the same enthusiasm for them!