Sony PCG-F420 Primary User Manual page 61

You can connect the notebook to a multimedia computer display that
includes built-in speakers and a microphone.
Use the symbol to locate the Monitor connector. Plug the display
cable into this connector.
Use the symbol to locate the Headphone connector. Plug the
speaker cable into this connector.
Use the symbol to locate the Microphone connector. Plug the
microphone cable into this connector.
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You can use a projector, such as the Sony LCD Projector, as an external
display.
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