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Yamaha YPT-300 61-key touch sensitive portable keyboard, released in 2005.

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Why can I hear nothing coming out of the speakers?

I turn my keyboard on and regardless of where the volune is I hear nothing. Its works otherwise though.

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why cant I get any sound from the speakers  of  Yamaha 450 keyboard?

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Hi @chanozga,

Like the answer above asks, do you get any audio from the headphone socket?

If you do then there may be a problem with the headphone socket not connecting the speakers back to the power amp when the headphones are removed from the socket.

Here’s an image taken from the service manual which shows how the headphones’ socket has contacts that break the circuit to the speakers when the headphones are inserted.

Block Image

(click on image to enlarge for better viewing)

If there is no audio at the headphone socket either, then here is a link to the service manual for the keyboard. Like most service manuals it has a full schematic circuit of the keyboard and a parts list which should enable you to find and fix the problem

To download the manual, click on the link above and then click on the “I am not a robot Captcha” checkbox below the Document preview box. Pass the test and then click on Go to Download. When the sentence changes from This file is downloadable free of charge (5/day): ...processing... to This file is downloadable free of charge (5/day): Download(yamaha psr-450 sm) click on Download. Be patient as it takes a little while to find the file.

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Headphones work ?

Volume knob is turning fine ?

No broken off headphone jack stuck in there ?

Maby the options allow to disable the builtin amplifier ?

Maby amplifier is dead. You need to let it repair or use an external amplifier with speakers.

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