Sony WM-33 Mechanism

The Sony WM-33 does not have a chassis for the tape transport mechanism, and instead the printed circuit board (PCB) provides a means to mount the mechanical components. As you can see, mounting the push button assembly and the motor drive on the PCB is only possible when the manufacturing is precise.

Drive Belts

The WM-33 has two drive belts, one for the capstan flywheel and the other for the spool winding and auto-stop mechanism.

Motor Drive

The motor mounts onto the PCB as well, and I love the precise and neat construction. For electronics engineers, this is very inspirational to see because when building on prototyping board, a neat construction is very important. I used the same principle when designing and building my microcontroller development system.

Pushbutton Assembly

Plastic push button assembly can last a long time providing it is stored in a cool dry place as heat can degrade the plastic and make it brittle. It is understood that heavy-handed use may damage the over 25-year-old components, especially, the pushbutton mechanism which has plastic mechanical parts.

Cogwheels

This is a lovely bit of engineering that is very simply and reliable. Excessive heat can make the plastics brittle and the plastic cogwheels can crack over time if the Walkman is not stored properly.

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