You are correct; it's impossible to fire all the hammers at once on the 1403 since they fire one at a time. Maybe the self-destructing printer is a different li

You are correct; it's impossible to fire all the hammers at once on the 1403 since they fire one at a time. Maybe the self-destructing printer is a different line printer, or maybe firing the hammers in the right sequence over-stresses the chain, but I suspect an urban legend.