Sony WM-FS493 Main Board
The WM-FS493 and WM-FS495 use the same main board design with slight differences in component and circuitry. Majority of the differences are due to the TV audio reception circuitry in the FS495 model. If you are trying to repair your unit, then the photographs of the audio IC and its block diagram may help to figure out how the system works.
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WM-FS493 Sports WalkmanReview
Sports Case
Audio Head
Drive Belt
Main Board
Radio
Mechanism
Motor Drive
Display Board