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No sound from Yamaha Electone HS-6 - Yamaha Music

Posted by Anonymous on

  • Anonymous Jan 13, 2010

    I have tried the headphone socket and yes i do get sound and the pedal works, checked the onboard fuses and they are both ok too.

    I have removed the speakers individualy and they also work! i am at a loss as to finding the solution.

    many thanks for your tips fredy2

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Fred Yearian

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First check if you get sound from the headphone jack.

Do you hear anything as the power comes on from the speakers..? A slight bump?

A lot of these dead audio things can be traced to a failure at the expression pedal. often these use a light dependent resistor and the illuminating lamp burns out. This is all down by the pedal.

Many of the Yamaha organs, including the FX20 I have, have circuitry that checks that the power amp has DC balance before a relay closes to connect the speaker. A failure in the amp can cause dead sound as well.

Posted on Jan 12, 2010

  • Fred Yearian Jan 14, 2010

    OK... That sounds like the relay that connects the speakers is not actuating.



    On the FX20 Yamaha, (The HS6 is PROBABLY similar) this relay does the following:



    It disconnects the speakers when headphones are plugged int. Hence, a failure in that switching circuit would disable the speakers.



    It delays for a period determined by an RC timer before closing the relay to connect the speakers.



    It monitors that the power amplifiers are in DC balance before connecting the speakers.



    The key is to get a schematic for the organ. Yamaha USUALLY sells a complete service manual for $15 on CD rom for their instruments through the Yamaha parts people in California. It would be a good investment for you... The parts person usually transfers you to another person who fills the order.



    The amplifiers in most of these organs are in the STK (Hybrid stick) type amplifiers. They are easily damaged so be careful when probing in the area.



    Since the headphones are working OK, I kind of lean toward a failure of the relay timing circuit or a failure of the headphone jack switch.

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  1. try to replace your power amp. stk 4026 11 a new one

Posted on Apr 13, 2010

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