Two Sony professional cd transports are staring me in the face. A closer look reveals a surprising amount of surface-mount technology. This is a more expensive way, but more nineties way to build electronics by using smaller more efficient components mounted on the surface of the PC boards without drilling holes. It makes for a cleaner look and better stability of the components. Checking the PC boards, I found their machining and pathways to have a professional layout and clean solder joints.
Heat is always a problem for electronics and most heat comes from the power supplies on cd players.
Since the 80's, component manufacturers have built-in protection for power supply chips that will thermally shut them down when they get over heated. You could not miss the power supply chip on the CD-240. A great step for those times you are playing in extreme heat conditions like in Florida, Brazil, etc. With this unit in a rack, you have almost 10 inches and 14 lbs. hanging on the front plate. That weight can double and triple if the rack is dropped.